Rework bus rating: defer datasheet-owned values, remove duplicate clauses, genericize drawing locators; fix building-automation cross-reference slug
---
title: Low Voltage Switchgear
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## Bus Rating {toc}
−### Main bus continuous current rating shall be [[drawing: as indicated on the one-line diagram]].
+### Main bus continuous current rating shall be as indicated in the datasheet.
```datasheet
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```
+### Short-circuit current rating shall equal or exceed the available fault current at the switchgear terminals.
+
```datasheet
label: Short-Circuit Current Rating
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```
+### Bus short-time withstand rating shall be coordinated with the downstream protective device settings required to maintain selective coordination.
+
```datasheet
label: Short-Time Withstand Rating
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```
−### Main bus continuous current rating shall be as indicated on the one-line diagram.
−
### Bus shall be braced for the available short-circuit current at the point of installation as determined by a short-circuit analysis per IEEE 551.
−### Short-circuit current rating shall equal or exceed the available fault current at the switchgear terminals.
−
### The Contractor shall verify available fault current with the utility provider and perform a short-circuit study per [[sync/short-circuit-study]] prior to equipment procurement.
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```
−### Switchgear overall dimensions and arrangement shall be [[drawing: per the equipment room layout drawings]].
+### Switchgear overall dimensions and arrangement shall be [[drawing: as indicated on the contract documents]].
### Enclosure shall be fabricated from galvanized steel with a minimum thickness of 12 gauge (2.66 mm) for structural members and 14 gauge (1.90 mm) for covers and doors.
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### Rear compartments shall have individual hinged doors with padlockable latches.
−### Switchgear overall dimensions and arrangement shall be per the equipment room layout drawings.
−
## Bus Bars {toc}
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### It shall not be possible to move a breaker between positions with the door closed unless motor operators are provided.
−### Main breaker frame size and trip rating shall be as indicated on the one-line diagram.
−
### LSIG trip units are recommended for all applications. {note}
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## Feeder Circuit Breakers {toc}
−### Feeder breaker sizes, quantities, and trip ratings are [[drawing: as indicated on the one-line diagram and panel/breaker schedules]]. {note}
+### Feeder breaker sizes, quantities, and trip ratings are [[drawing: as indicated on the one-line diagram and breaker schedules]]. {note}
```datasheet
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```
−### Feeder breaker sizes, quantities, and trip ratings shall be as indicated on the one-line diagram and panel/breaker schedules.
−
### Auxiliary contacts shall be provided on every breaker regardless of other accessory selections.
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## Protection coordination study shall be performed per [[sync/protective-coordination-study]].
−## Relay settings shall be as indicated on the relay setting schedule.
−
# Metering and Instrumentation {toc}
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- General monitoring: Class 0.6 accuracy
−### Current transformers shall comply with IEEE C57.13.
−
−### Current transformer accuracy class shall be appropriate for the connected metering: Class 0.3 for revenue metering, Class C200 or higher for protective relaying, and Class 0.6 for general monitoring.
−
### Current transformers for metering and relaying shall be provided on separate cores.
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```
−### Coordinate communication wiring and protocols with [[sync/building-automation]]. {note}
−
### Where building energy code requires submetering (ASHRAE 90.1 Section 8.4.3 or local amendments), meter data shall be accessible via the selected communication protocol for integration with the building management system.
−### The Contractor shall coordinate communication wiring and protocols with [[sync/building-automation]].
+### The Contractor shall coordinate communication wiring and protocols with [[sync/building-automation-system]].
# Finish and Identification {toc}
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```
−### Equipment labeling shall follow [[sync/equipment-labeling]] conventions.
−
−### Manufacturer shall provide engraved phenolic nameplates for the switchgear assembly and each individual device, identifying the switchgear designation and one-line reference, bus ratings (voltage, continuous current, short-circuit), individual breaker designation, frame size, and trip rating, current transformer ratios and accuracy class, and arc flash warning labels per NFPA 70E and IEEE 1584.
−
### Mimic bus diagram shall be provided on the front of the switchgear showing the bus configuration, breaker positions, and instrument transformer locations.
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−### Contractor shall engage a qualified independent testing firm to perform acceptance testing per NETA ATS.
−
### Acceptance testing shall occur after installation is complete and before the equipment is energized.
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## Manufacturer shall provide the following additional spare parts: one set of replacement fuses for each fuse type and rating installed, one set of replacement indicating lights for each type installed, one set of racking handle, breaker test plugs, and portable closing tools, and one complete set of keys for all locks.