Medium Voltage Switchgear
Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
Showing changes from Rev 5
to Rev 6
in Medium Voltage Switchgear.
---
title: Medium Voltage Switchgear
−category: Power Distribution
+category: Electrical / Power Distribution Equipment
toc_depth: 3
description: >
…74 unchanged lines
### Contractor shall submit the following for review prior to fabrication.
−### Action submittals shall include the deliverables listed below.
- Shop drawings showing front, side, and rear elevations with overall dimensions, weight per section, and shipping splits
…29 unchanged lines
- "Conduit/cable entry diagrams"
- "Recommended spare parts list"
−default: "Shop drawings (front, side, rear elevations) with shipping splits"
+default:
+ - "Shop drawings (front, side, rear elevations) with shipping splits"
+ - "Single line diagram with full ratings"
+ - "Bill of materials"
+ - "Time-current coordination curves and relay setting tables"
+ - "Control schematics and wiring diagrams"
+ - "Cable termination details"
+ - "Bus bracing and short-circuit calculations"
+ - "Heat loss data per section"
+ - "Conduit/cable entry diagrams"
+ - "Recommended spare parts list"
```
…25 unchanged lines
- "Warranty documentation"
- "Spare parts inventory with reorder information and storage location"
−default: [Operation and maintenance manuals, As-built shop drawings, schematics, and one-line diagrams, Factory production test reports and design test certifications, Field acceptance test reports per NETA ATS, Arc flash incident energy analysis and installed labels, Protective relay setting files (native and vendor-neutral export), Warranty documentation, Spare parts inventory with reorder information and storage location]
+default:
+ - "Operation and maintenance manuals"
+ - "As-built shop drawings, schematics, and one-line diagrams"
+ - "Factory production test reports and design test certifications"
+ - "Field acceptance test reports per NETA ATS"
+ - "Arc flash incident energy analysis and installed labels"
+ - "Protective relay setting files (native and vendor-neutral export)"
+ - "Warranty documentation"
+ - "Spare parts inventory with reorder information and storage location"
```
…38 unchanged lines
## Ambient and Altitude {toc}
+### The design maximum ambient temperature at the installation shall be as indicated in the datasheet.
+
```datasheet
label: Ambient Temperature (Maximum)
−type: select
+type: range
unit: °C
options:
− - "40°C (standard rating)"
− - "50°C (elevated ambient)"
− - "55°C (desert/rooftop rating)"
−default: "40°C (standard rating)"
+ min: 40
+ max: 55
+ setpoints: [40, 50, 55]
+default: 40
```
+### 40°C is the standard rating basis for the usual service conditions; 50°C applies to elevated-ambient installations and 55°C to desert or rooftop installations. {note}
+
+### The installation altitude shall be as indicated in the datasheet.
+
```datasheet
label: Installation Altitude
type: select
options:
− - "Below 3,300 ft (1,000 m) - No derating"
− - "3,300 - 6,600 ft (1,000 - 2,000 m) - Derating may apply"
− - "Above 6,600 ft (2,000 m) - Derating required per IEEE C37.04"
−default: "Below 3,300 ft (1,000 m) - No derating"
+ - "Below 3,300 ft (1,000 m) - no derating"
+ - "3,300 - 6,600 ft (1,000 - 2,000 m)"
+ - "Above 6,600 ft (2,000 m) - consult manufacturer"
+default: "Below 3,300 ft (1,000 m) - no derating"
```
…4 unchanged lines
## Corrosion Severity {toc}
+### The corrosion severity classification of the installation environment shall be as indicated in the datasheet.
+
```datasheet
label: Corrosion Severity
…4 unchanged lines
- "C4 - High (coastal, chemical exposure)"
- "C5 - Very High (industrial, marine)"
−default: "C2 - Low (indoor, climate-controlled)"
```
+### The corrosion classification is an assessment of the actual installation environment made by the Engineer; there is no classification that is correct for every project, so the field carries no default. {note}
+
### For installations classified C4 or C5, primary bus shall be silver-plated copper at all joint contact surfaces, hardware shall be stainless steel, and the enclosure paint system shall provide enhanced corrosion protection.
…2 unchanged lines
## Seismic Requirements {toc}
+### The seismic certification basis shall be as indicated in the datasheet.
+
```datasheet
label: Seismic Certification
type: select
+drawing_ref: "structural drawings"
options:
- "Not required"
- "IBC/ASCE 7 - Importance Factor 1.0"
- "IBC/ASCE 7 - Importance Factor 1.5 (essential facility)"
- "OSHPD pre-approval required (California healthcare)"
−default: "Not required"
+default: deferred
```
+### The Seismic Design Category and Importance Factor are established by the project's structural design; the electrical scope adopts them rather than setting them. {note}
+
### Where required by the applicable building code, switchgear shall be seismically certified by shake-table testing per ICC ES AC156 or by analysis per ASCE 7.
…8 unchanged lines
## System Ratings {toc}
+### Whether the switchgear serves as utility-customer service entrance equipment shall be as indicated in the datasheet.
+
```datasheet
label: Service Entrance Equipment
type: radio
+drawing_ref: "one-line diagram"
options:
− - "Yes - Utility-customer service entrance"
− - "No - Downstream distribution"
−default: "No - Downstream distribution"
+ - "Utility-customer service entrance equipment"
+ - "Downstream distribution equipment"
+default: deferred
```
+### Where switchgear serves as utility-customer service entrance equipment, it shall comply with NFPA 70 Article 490 and the serving utility's interconnection requirements, including provisions for utility metering current and voltage transformers, primary disconnect, and available fault current verification.
+
+### Coordinate primary metering compartment configuration, sealability, and clearances with the serving utility prior to submittal.
+
+### The nominal system voltage and the corresponding equipment voltage class shall be as indicated in the datasheet.
+
```datasheet
label: Nominal System Voltage Class
−type: select
+type: range
unit: kV
+drawing_ref: "one-line diagram"
options:
− - "4.16 kV (5 kV class)"
− - "12.47 kV (15 kV class)"
− - "13.2 kV (15 kV class)"
− - "13.8 kV (15 kV class)"
− - "24.94 kV (27 kV class)"
− - "34.5 kV (38 kV class)"
−default: "13.8 kV (15 kV class)"
+ min: 4.16
+ max: 34.5
+ setpoints: [4.16, 12.47, 13.2, 13.8, 24.94, 34.5]
+default: deferred
```
+### Nominal system voltage shall be one of the standard values defined in ANSI C84.1.
+
+### Equipment voltage class shall correspond to the selected nominal system voltage as follows:
+
+| Nominal System Voltage | Equipment Voltage Class |
+|------------------------|-------------------------|
+| 4.16 kV | 5 kV class |
+| 12.47 kV | 15 kV class |
+| 13.2 kV | 15 kV class |
+| 13.8 kV | 15 kV class |
+| 24.94 kV | 27 kV class |
+| 34.5 kV | 38 kV class |
+
+### The voltage class designates the rated maximum voltage of the equipment per IEEE C37.06 (e.g., 4.76 kV equipment is referred to as 5 kV class and is suitable for 4.16 kV nominal systems). {note}
+
+### Coordinate the selected voltage class with the serving utility distribution voltage.
+
+### The system frequency shall be as indicated in the datasheet.
+
```datasheet
label: System Frequency
…6 unchanged lines
```
+### 60 Hz is the North American norm and is the datasheet default; 50 Hz equipment is a distinct product selection, available for systems that operate at that frequency. {note}
+
+### The system grounding method shall be as indicated in the datasheet.
+
```datasheet
label: System Grounding
type: select
+drawing_ref: "one-line diagram"
options:
- "Solidly grounded wye"
…2 unchanged lines
- "Ungrounded"
- "Resonant grounded (Petersen coil)"
−default: "Low-resistance grounded wye"
+default: deferred
```
−### Where switchgear serves as utility-customer service entrance equipment, it shall comply with NFPA 70 Article 490 and the serving utility's interconnection requirements, including provisions for utility metering current and voltage transformers, primary disconnect, and available fault current verification.
−
−### Coordinate primary metering compartment configuration, sealability, and clearances with the serving utility prior to submittal.
−
−### Nominal system voltage shall be one of the standard values defined in ANSI C84.1.
−
−### The voltage class designates the rated maximum voltage of the equipment per IEEE C37.06 (e.g., 4.76 kV equipment is referred to as 5 kV class and is suitable for 4.16 kV nominal systems). {note}
−
−### Coordinate the selected voltage class with the serving utility distribution voltage.
−
### System grounding selection drives ground fault sensing scheme, ground current magnitude, neutral grounding equipment design, and protective relay configuration. {note}
### Low-resistance grounding (typically 200 A to 400 A let-through) is the most common configuration for utility-customer 5 kV and 15 kV distribution because it limits ground fault current to levels that minimize equipment damage while still allowing selective coordination of feeder ground fault elements. {note}
−### Solidly grounded systems are more common where the medium-voltage system feeds low-voltage transformers exclusively and ground fault current must be high enough to trip phase overcurrent devices. {note}
+### Solidly grounded systems are more common where the medium-voltage system feeds low-voltage transformers exclusively and ground fault current must be high enough to trip phase overcurrent devices.
### High-resistance grounding is selected where service continuity on a first ground fault is required (typically industrial process loads). {note}
…3 unchanged lines
## Insulation Level (BIL) {toc}
+### The basic impulse insulation level shall be as indicated in the datasheet.
+
```datasheet
label: Basic Impulse Level (BIL)
…7 unchanged lines
- "150 kV BIL (38 kV class)"
- "200 kV BIL (38 kV class, special)"
−default: "95 kV BIL (15 kV class)"
```
−### BIL shall match the rated maximum voltage of the switchgear per IEEE C37.06.
+### BIL shall be the standard value assigned by IEEE C37.06 to the rated maximum voltage of the switchgear, except where an increased level is specified for insulation coordination.
### Standard BIL is sufficient for most utility-fed distribution applications. {note}
…3 unchanged lines
## Continuous Current and Short-Circuit Ratings {toc}
+### Main bus continuous current rating shall be as indicated in the datasheet.
+
```datasheet
label: Main Bus Continuous Current
type: range
unit: A
−drawing_ref: true
+drawing_ref: "one-line diagram"
options:
min: 1200
max: 4000
setpoints: [1200, 2000, 3000, 4000]
−default: 2000
+default: deferred
```
+### Short-circuit interrupting rating, expressed as a symmetrical rms current value per IEEE C37.04, shall equal or exceed the available three-phase fault current at the switchgear terminals, and shall be as indicated in the datasheet.
+
```datasheet
label: Short-Circuit Interrupting Rating (symmetrical)
type: select
unit: kA
+drawing_ref: "one-line diagram"
options:
- "25 kA sym"
…2 unchanged lines
- "50 kA sym"
- "63 kA sym"
−default: "40 kA sym"
+default: deferred
```
+### Bus shall be braced for the available short-circuit current at the point of installation as determined by a short-circuit analysis per IEEE C37.010.
+
+### The application short-circuit current shall be determined per IEEE C37.010, which includes evaluation of the X/R ratio of the system and the resulting asymmetry factor.
+
+### Where the system X/R ratio exceeds the test X/R used to qualify the breaker, the breaker's interrupting rating shall be derated per IEEE C37.010.
+
+### Verify available fault current with the utility provider and perform a short-circuit study per [[sync/short-circuit-study]] prior to equipment procurement.
+
+### Close-and-latch rating, also referred to as the momentary or making current rating, shall be the IEEE C37.06 preferred value associated with the selected interrupting rating unless a higher rating is indicated in the datasheet.
+
+### The close-and-latch rating basis shall be as indicated in the datasheet.
+
```datasheet
label: Close-and-Latch Rating (asymmetrical, peak)
type: select
options:
− - "Matched to interrupting rating per IEEE C37.06"
− - "Increased above standard - specify per project requirements"
−default: "Matched to interrupting rating per IEEE C37.06"
+ - "Matched to the interrupting rating per IEEE C37.06"
+ - "Increased above the IEEE C37.06 preferred value for the project"
+default: "Matched to the interrupting rating per IEEE C37.06"
```
+### The close-and-latch rating tracks the interrupting rating in the ordinary case; it is the peak asymmetrical current the breaker can close into and latch without damage, approximately 2.6 to 2.7 times the symmetrical interrupting rating depending on the rating standard generation. A rating above the C37.06 preferred value is occasionally required where the system X/R ratio produces an asymmetry factor beyond the standard assumption. {note}
+
+### The short-time current withstand duration shall be as indicated in the datasheet.
+
```datasheet
label: Short-Time Withstand (Momentary) Duration
…5 unchanged lines
```
−### Main bus continuous current rating shall be as indicated in the datasheet.
+### The short-time current withstand duration governs how long the breaker and bus can carry the rated short-circuit current without operating; the standard 2-second rating is sufficient for most coordinated protection schemes. {note}
−### Bus shall be braced for the available short-circuit current at the point of installation as determined by a short-circuit analysis per IEEE C37.010.
+### Extended 3-second ratings should be specified where the coordination study identifies clearing times that approach 2 seconds at the main breaker.
−### Short-circuit interrupting rating, expressed as a symmetrical rms current value per IEEE C37.04, shall equal or exceed the available three-phase fault current at the switchgear terminals.
−
−### The application short-circuit current shall be determined per IEEE C37.010, which includes evaluation of the X/R ratio of the system and the resulting asymmetry factor.
−
−### Where the system X/R ratio exceeds the test X/R used to qualify the breaker, the breaker's interrupting rating shall be derated per IEEE C37.010.
−
−### Verify available fault current with the utility provider and perform a short-circuit study per [[sync/short-circuit-study]] prior to equipment procurement.
−
−### Close-and-latch rating, also referred to as the momentary or making current rating, shall be the IEEE C37.06 preferred value associated with the selected interrupting rating.
−
−### The close-and-latch rating represents the peak asymmetrical current the breaker can close into and latch without damage; it is approximately 2.6 to 2.7 times the symmetrical interrupting rating depending on the rating standard generation. {note}
−
−### The short-time current withstand duration governs how long the breaker and bus can carry the rated short-circuit current without operating. {note}
−
−### The standard 2-second rating is sufficient for most coordinated protection schemes. {note}
−
−### Extended 3-second ratings should be specified only where the coordination study identifies clearing times that approach 2 seconds at the main breaker.
−
## Ground Bus {toc}
+### Whether a ground bus is furnished with the assembly shall be as indicated in the datasheet.
+
```datasheet
label: Ground Bus
type: radio
options:
− - "Included - Full length of assembly"
+ - "Included — full length of the assembly"
- "Not required"
−default: "Included - Full length of assembly"
+default: "Included — full length of the assembly"
```
−### Ground bus shall be bare copper, minimum 1/4 in. x 2 in. cross-section, extending the full length of the switchgear assembly.
+### A full-length ground bus is the normal construction and is the datasheet default; "Not required" exists for the rare retrofit line-up that is bonded to an existing station ground bus carried through the switchgear structure. {note}
+### Where a ground bus is furnished, it shall be bare copper, minimum 1/4 in. x 2 in. cross-section, extending the full length of the switchgear assembly.
+
### Ground bus shall be accessible without removing any covers or barriers required for safe operation.
…14 unchanged lines
- Low-voltage control compartment, with a grounded metal barrier separating control wiring from all primary components
−### Switchgear shall be metal-clad per IEEE C37.20.2: each major primary functional component shall be enclosed in its own grounded metal compartment, and grounded metal barriers shall separate compartments from one another and from the main bus.
−
−### The compartments listed above shall be provided as a minimum for each circuit breaker cubicle.
−
### Primary Disconnect Shutters {toc}
…10 unchanged lines
## Enclosure {toc}
+### The enclosure type shall be as indicated in the datasheet.
+
```datasheet
label: Enclosure Type
…2 unchanged lines
- "Indoor - NEMA 1 (standard)"
- "Indoor - NEMA 1A (gasketed)"
− - "Outdoor - Non-walk-in (NEMA 3R aisleless)"
− - "Outdoor - Walk-in (protected aisle)"
+ - "Outdoor - non-walk-in (NEMA 3R aisleless)"
+ - "Outdoor - walk-in (protected aisle)"
default: "Indoor - NEMA 1 (standard)"
```
+### The accessibility configuration shall be as indicated in the datasheet.
+
```datasheet
label: Accessibility
type: radio
options:
− - "Front accessible only (cable entry from front lower compartment)"
+ - "Front accessible (cable entry from front lower compartment)"
- "Front and rear accessible (rear cable and bus access)"
default: "Front and rear accessible (rear cable and bus access)"
```
+### The number of vertical sections shall be as indicated in the datasheet.
+
```datasheet
label: Number of Vertical Sections
type: range
−drawing_ref: true
+unit: sections
+drawing_ref: "one-line diagram"
options:
min: 1
max: 20
step: 1
−default: 4
+default: deferred
```
+### The primary cable entry direction shall be as indicated in the datasheet.
+
```datasheet
label: Primary Cable Entry
type: select
+drawing_ref: "electrical plans"
options:
- "Bottom entry"
- "Top entry"
- "Top and bottom entry"
−default: "Bottom entry"
+default: deferred
```
…12 unchanged lines
## Arc-Resistant Construction {toc}
+### Where arc-resistant construction is specified for the project, the accessibility type shall be as indicated in the datasheet.
+
```datasheet
label: Arc-Resistant Rating (IEEE C37.20.7)
type: select
options:
- "Not required"
− - "Type 1 - Front only"
− - "Type 2 - Front, rear, and sides"
+ - "Type 1 - front"
+ - "Type 2 - front, rear, and sides"
- "Type 2B - Type 2 plus low-voltage compartment door open"
- "Type 2C - Type 2 plus between compartments"
−default: "Not required"
```
+### Arc-resistant construction is an added-cost option rather than a baseline requirement; projects that do not specify it record "Not required", and the field is left blank until the decision is made. {note}
+
### Arc-resistant construction per IEEE C37.20.7 provides a defined level of protection against the effects of an internal arcing fault by redirecting arc gases and pressure through plenums, ducts, or pressure relief flaps to areas where personnel are not present, while reinforced enclosure construction contains the arc event. {note}
### The accessibility type designates which sides of the equipment provide protection when personnel are present: {note}
…14 unchanged lines
## Primary Bus {toc}
+### Primary bus shall be high-conductivity copper.
+
+### The joint contact plating shall be as indicated in the datasheet.
+
```datasheet
label: Primary Bus Material
…5 unchanged lines
```
+### The primary bus insulation treatment shall be as indicated in the datasheet.
+
```datasheet
label: Primary Bus Insulation
…5 unchanged lines
```
+### Provisions for future bus extension shall be as indicated in the datasheet.
+
```datasheet
label: Bus Extension Provisions
…6 unchanged lines
```
−### Primary bus shall be high-conductivity copper.
−
### All joint contact surfaces shall be silver-plated to maintain low contact resistance over the equipment's service life; tin-plating is acceptable in non-corrosive environments where the Owner accepts the lower service life of tin contacts.
…22 unchanged lines
## Breaker Type {toc}
+### The circuit breaker interrupting medium shall be as indicated in the datasheet.
+
```datasheet
label: Circuit Breaker Interrupting Medium
…13 unchanged lines
## Drawout Construction {toc}
+### The breaker racking mechanism shall be as indicated in the datasheet.
+
```datasheet
label: Racking Mechanism
…24 unchanged lines
## Operating Mechanism {toc}
+### The breaker operating mechanism shall be as indicated in the datasheet.
+
```datasheet
label: Operating Mechanism Type
…11 unchanged lines
## Control Voltage {toc}
+### The DC control voltage shall be as indicated in the datasheet and shall match the station battery system serving the switchgear.
+
```datasheet
label: Breaker Control Voltage (DC)
−type: select
+type: range
unit: VDC
+drawing_ref: "one-line diagram"
options:
− - "48 VDC"
− - "125 VDC"
− - "250 VDC"
−default: "125 VDC"
+ min: 48
+ max: 250
+ setpoints: [48, 125, 250]
+default: deferred
```
+### DC control voltage is supplied from the station battery system and operates the trip coil, close coil, and spring charging motor. 125 VDC is the dominant control voltage for industrial and utility-customer installations in the US market. 48 VDC is used in some telecommunications and data center environments where a 48 VDC plant already exists. 250 VDC is reserved for larger utility-style substations. {note}
+
+### The AC control voltage, where DC control power is not provided, shall be as indicated in the datasheet.
+
```datasheet
label: Breaker Control Voltage (AC, for spring charging where DC is not available)
type: select
options:
− - "Not required - DC control"
− - "120 VAC (single-phase, from local control transformer)"
−default: "Not required - DC control"
+ - "Not required — DC control"
+ - "120 VAC (single-phase, from a control power transformer within the switchgear)"
+default: "Not required — DC control"
```
−### DC control voltage is supplied from the station battery system and operates the trip coil, close coil, and spring charging motor. 125 VDC is the dominant control voltage for industrial and utility-customer installations in the US market. 48 VDC is used in some telecommunications and data center environments where a 48 VDC plant already exists. 250 VDC is reserved for larger utility-style substations. {note}
+### Where DC control power is not provided, spring charging motors and control circuits shall operate from 120 VAC single-phase supplied by a control power transformer within the switchgear.
### Where the switchgear is supplied with a station battery, the battery and charger shall comply with [[sync/dc-battery-systems]].
…3 unchanged lines
## Main Circuit Breaker {toc}
+### The main device configuration shall be as indicated in the datasheet.
+
```datasheet
label: Main Breaker Configuration
type: select
+drawing_ref: "one-line diagram"
options:
- "Main circuit breaker (drawout)"
- "Main disconnect switch (utility-furnished primary disconnect)"
- "Main lugs only (no main device)"
−default: "Main circuit breaker (drawout)"
+default: deferred
```
…6 unchanged lines
## Tie Circuit Breaker {toc}
+### The bus configuration and tie breaker arrangement shall be as indicated in the datasheet.
+
```datasheet
label: Main-Tie-Main Configuration
type: radio
+drawing_ref: "one-line diagram"
options:
- "Single-ended (no tie breaker)"
- "Double-ended with normally-open tie breaker (manual transfer)"
- "Double-ended with automatic transfer (closed-transition or open-transition)"
−default: "Single-ended (no tie breaker)"
+default: deferred
```
…4 unchanged lines
## Feeder Circuit Breakers {toc}
+### Feeder breaker quantities shall be [[drawing: as indicated on the one-line diagram]].
+
+### Feeder breaker frame sizes and continuous current ratings shall be [[drawing: as indicated on the breaker schedule]].
+
+### Auxiliary contacts shall be provided on every breaker for control, indication, and interlock purposes regardless of other accessory selections.
+
+### Optional breaker accessories shall be furnished as indicated in the datasheet.
+
```datasheet
label: Feeder Breaker Accessories
type: checkbox
options:
− - "Auxiliary contacts (minimum 2a + 2b)"
- "Shunt trip"
- "Undervoltage release"
- "Trip-free mechanical interlock (paired breakers)"
- "Kirk key interlock"
- "Motor operator for remote close/trip"
− - "Breaker position indication (drawout connected/test/disconnected)"
−default: "Auxiliary contacts (minimum 2a + 2b)"
+ - "Electrical breaker position indication (connected/test/disconnected contacts)"
```
−### Feeder breaker sizes, quantities, and continuous current ratings are [[drawing: as indicated on the one-line diagram and breaker schedules]].
−
−### Auxiliary contacts shall be provided on every breaker for control, indication, and interlock purposes regardless of other accessory selections.
−
### Contacts shall indicate breaker open/close status and shall be wired to terminal blocks accessible without removing the breaker from its compartment.
…2 unchanged lines
## Relay Platform {toc}
+### The protective relay architecture shall be as indicated in the datasheet.
+
```datasheet
label: Protective Relay Platform
…13 unchanged lines
## Protection Functions {toc}
+### Protection function selection shall be coordinated with the protection coordination study per [[sync/protective-coordination-study]] and shall result in selective tripping for all faults within the protected zone while allowing downstream devices to clear faults within their respective zones.
+
+### The protection functions enabled at the main breaker shall be as indicated in the datasheet.
+
```datasheet
label: Main Breaker Protection Functions
…9 unchanged lines
- "Breaker failure (50BF)"
- "Synchronism check (25)"
−default: "Phase overcurrent (50/51)"
+default:
+ - "Phase overcurrent (50/51)"
+ - "Ground overcurrent (50G/51G or 50N/51N)"
+ - "Breaker failure (50BF)"
```
+### The protection functions enabled at each feeder breaker shall be as indicated in the datasheet.
+
```datasheet
label: Feeder Breaker Protection Functions
…5 unchanged lines
- "Recloser logic (79) - overhead feeders"
- "Breaker failure (50BF)"
−default: "Phase overcurrent (50/51)"
+default:
+ - "Phase overcurrent (50/51)"
+ - "Ground overcurrent (50G/51G or 50N/51N)"
```
+### Where the switchgear serves medium-voltage motor loads, the motor protection functions shall be as indicated in the datasheet.
+
```datasheet
−label: Motor Feeder Protection Functions (where motor loads are served)
+label: Motor Feeder Protection Functions
type: checkbox
options:
− - "Not applicable - no motor feeders"
+ - "Not applicable — no motor feeders"
- "Thermal model (49)"
- "Locked rotor / acceleration time (48/51LR)"
…3 unchanged lines
- "Stator ground fault (50G)"
- "Restart inhibit / starts-per-hour (66)"
−default: "Not applicable - no motor feeders"
```
−### Protection function selection shall be coordinated with the protection coordination study per [[sync/protective-coordination-study]] and shall result in selective tripping for all faults within the protected zone while allowing downstream devices to clear faults within their respective zones.
+### Where the switchgear serves no motor feeders, the "Not applicable" value records that fact explicitly rather than leaving the field ambiguous. {note}
−### Relay settings are [[drawing: as indicated on the relay setting schedule]].
+### Relay settings shall be [[drawing: as indicated on the relay setting schedule]].
## Ground Fault Sensing {toc}
+### The ground fault sensing method shall be as indicated in the datasheet.
+
```datasheet
label: Ground Fault Sensing Method
…12 unchanged lines
## Bus Differential Protection {toc}
+### Where bus differential protection is provided, the scheme shall be as indicated in the datasheet.
+
```datasheet
label: Bus Differential Protection (87B)
…3 unchanged lines
- "High-impedance differential"
- "Low-impedance differential (numerical)"
−default: "Not required"
```
+### Bus differential protection is not required on every installation; where the coordination study does not call for it, the "Not required" value records that decision. {note}
+
### Bus differential protection (ANSI 87B) provides fast (typically less than one cycle) clearing of faults on the main bus. It is recommended for switchgear where the main breaker upstream clearing time is too long to limit damage from a main bus fault, for installations with high available fault current, and for arc-resistant switchgear where reducing arc duration significantly reduces incident energy. {note}
…2 unchanged lines
## Communications {toc}
+### The relay communications protocol shall be as indicated in the datasheet and shall be supported by the Owner's monitoring or SCADA system.
+
```datasheet
label: Relay Communications Protocol
…3 unchanged lines
- "Modbus RTU (RS-485)"
- "Modbus TCP/IP (Ethernet)"
− - "IEC 61850 MMS (station bus only)"
+ - "IEC 61850 MMS (station bus)"
- "IEC 61850 MMS + GOOSE (station bus with peer-to-peer)"
−default: "DNP3 (serial or TCP/IP)"
```
…8 unchanged lines
## Instrument Transformers {toc}
+### The voltage transformer configuration shall be as indicated in the datasheet.
+
```datasheet
label: Voltage Transformer Configuration
type: select
options:
− - "Not required (no VTs)"
+ - "Not required — no voltage transformers"
- "Open delta (2 VTs) - line-to-line metering"
- "Wye-wye (3 VTs) - line-to-neutral and line-to-line metering"
…14 unchanged lines
### VTs shall be drawout or roll-out with current-limiting primary fuses.
−### Accuracy class shall be appropriate for the connected function as listed above.
−
### Current transformers for metering and relaying shall be provided on separate cores.
…8 unchanged lines
## Power Monitoring {toc}
+### The metering provided at the switchgear shall be as indicated in the datasheet.
+
```datasheet
label: Metering Type
type: select
options:
- "No metering"
− - "Multifunction relay metering only (no dedicated meters)"
− - "Digital multifunction meter (main only)"
− - "Digital multifunction meter (main and each feeder)"
+ - "Multifunction relay metering (no dedicated meters)"
+ - "Digital multifunction meter at the main"
+ - "Digital multifunction meter at the main and each feeder"
- "Revenue-grade metering per utility requirements"
−default: "Digital multifunction meter (main only)"
+default: "Digital multifunction meter at the main"
```
+### The metered quantities and recording functions shall be as indicated in the datasheet.
+
```datasheet
label: Meter Functions
…9 unchanged lines
- "Waveform capture"
- "Sequence-of-events recording"
−default: "Voltage (L-L and L-N all phases)"
+default:
+ - "Voltage (L-L and L-N all phases)"
+ - "Current (per phase and neutral/ground)"
+ - "Power factor (per phase and total)"
+ - "kW / kVA / kVAR (demand and instantaneous)"
+ - "kWh / kVARh energy accumulation"
+ - "Min/max recording with time stamp"
```
…4 unchanged lines
# Finish and Identification {toc}
+## The enclosure finish color shall be as indicated in the datasheet.
+
```datasheet
label: Finish Color
…12 unchanged lines
## Labeling {toc}
+### Manufacturer shall provide engraved nameplates for the switchgear assembly and each individual device.
+
### Nameplates shall identify:
…6 unchanged lines
- Arc flash warning labels per NFPA 70E and IEEE 1584
+### The nameplate material shall be as indicated in the datasheet.
+
```datasheet
label: Nameplate Material
…6 unchanged lines
```
−### Manufacturer shall provide engraved phenolic nameplates for the switchgear assembly and each individual device.
−
−### Nameplates shall identify the switchgear designation, bus and device ratings, instrument transformer ratios and accuracy classes, arc-resistant rating where applicable, and arc flash warning information as listed above.
−
### Mimic bus diagram shall be provided on the front of each main and tie breaker section showing the bus configuration, breaker position, and source identification.
…18 unchanged lines
- Visual and dimensional inspection against approved shop drawings
+### Factory acceptance test witnessing shall be as indicated in the datasheet.
+
```datasheet
label: Factory Acceptance Test
…6 unchanged lines
```
−### The manufacturer shall perform the production tests listed above on the completed switchgear assembly per IEEE C37.20.2 and IEEE C37.09.
−
### Where witnessed factory testing is specified, the manufacturer shall provide a minimum of two weeks advance notice of test readiness.
…24 unchanged lines
- Verification of IEC 61850 GOOSE messages and trip times, where applicable
+### The scope of field testing and startup services shall be as indicated in the datasheet.
+
```datasheet
label: Field Testing Requirements
type: radio
options:
- "NETA acceptance testing and manufacturer startup"
− - "NETA acceptance testing only"
− - "Manufacturer startup only"
+ - "NETA acceptance testing without manufacturer startup"
+ - "Manufacturer startup without independent NETA testing"
default: "NETA acceptance testing and manufacturer startup"
```
−### Contractor shall engage a qualified independent testing firm to perform acceptance testing per NETA ATS Section 7.2 (medium-voltage switchgear) and Section 7.6 (medium-voltage circuit breakers).
+### Where independent NETA testing is indicated in the datasheet, Contractor shall engage a qualified independent testing firm to perform acceptance testing per NETA ATS Section 7.2 (medium-voltage switchgear) and Section 7.6 (medium-voltage circuit breakers).
### Testing shall occur after installation is complete and before the equipment is energized.
−### Field acceptance tests shall include the items listed above as a minimum.
−
## Infrared Thermographic Inspection {toc}
+### The infrared thermographic inspection schedule shall be as indicated in the datasheet.
+
```datasheet
label: Infrared Thermographic Inspection
type: radio
options:
- "Initial scan within 90 days of energization, follow-up at 11 months"
− - "Initial scan within 90 days of energization only"
+ - "Initial scan within 90 days of energization"
- "Not required"
default: "Initial scan within 90 days of energization, follow-up at 11 months"
```
−### Infrared scanning shall be performed under normal operating load conditions (minimum 40% of rated load where practical) through the infrared inspection windows specified above.
+### Where an infrared scan is indicated in the datasheet, it shall be performed under normal operating load conditions (minimum 40% of rated load where practical) through the infrared inspection windows specified above.
### All connections exceeding 10°C rise above ambient shall be reported and corrected.
…34 unchanged lines
### Remove all temporary shipping braces, blocking, and desiccants prior to final assembly.
−### After assembly, the items listed above shall be verified before energizing.
−
## Working Clearance {toc}
…55 unchanged lines
# Warranty {toc}
+## The manufacturer shall warrant the switchgear for the period indicated in the datasheet.
+
```datasheet
label: Warranty Period
…7 unchanged lines
```
+## The warranty coverage scope shall be as indicated in the datasheet.
+
```datasheet
−label: Extended Warranty Coverage
−type: checkbox
+label: Warranty Coverage Scope
+type: radio
options:
- "Parts only"
- "Parts and labor"
+default: "Parts only"
+```
+
+## Additional warranty services shall be provided as indicated in the datasheet.
+
+```datasheet
+label: Additional Warranty Services
+type: checkbox
+options:
- "Emergency response (24/7 with 4-hour commitment)"
- "Scheduled preventive maintenance (annual)"
- "Protective relay setting management and version control"
−default: "Parts only"
```
…4 unchanged lines
# Spare Parts {toc}
+## Spare circuit breakers shall be furnished as indicated in the datasheet.
+
```datasheet
label: Spare Circuit Breakers
…21 unchanged lines
## Spare breakers shall be stored on a breaker handling/lift truck supplied by the manufacturer, located in the electrical room or substation control building.