Corpus sync: neutrality remakes, note hygiene, datasheet relocation, transformer-split cross-refs
---
title: Common Work Results for Electrical
…46 unchanged lines
### The electrical installation shall comply with the edition of NFPA 70 (National Electrical Code) adopted by the Authority Having Jurisdiction at the project location, together with all state and local amendments in force.
−### The Contractor shall confirm the adopted NEC edition and applicable amendments with the Authority Having Jurisdiction before commencing rough-in, and shall notify the Engineer of Record in writing of any amendment that conflicts with the contract documents.
−
−### Many jurisdictions lag the published NEC by one or more cycles, so the edition assumed in design must be reconciled against the locally adopted edition rather than presumed to be the most recent publication. {note}
−
```datasheet
label: Governing NEC Edition
…7 unchanged lines
```
+### The Contractor shall confirm the adopted NEC edition and applicable amendments with the Authority Having Jurisdiction before commencing rough-in, and shall notify the Engineer of Record in writing of any amendment that conflicts with the contract documents.
+
+### Many jurisdictions lag the published NEC by one or more cycles, so the edition assumed in design must be reconciled against the locally adopted edition rather than presumed to be the most recent publication. {note}
+
## Voltage System {toc}
### The basis-of-design utilization voltage system shall be declared here and shall govern all downstream sections including luminaires, motor feeders, and panel schedules.
−### The default building distribution shall be 480Y/277V, 3Φ, 4-wire, 60 Hz, with 208Y/120V derived through transformers for receptacle and small-equipment loads, unless the drawings indicate otherwise.
−
−### Declaring the voltage system once prevents the common coordination failure in which downstream sections each assume a different voltage and the discrepancy is not caught until equipment submittals arrive. {note}
−
```datasheet
label: Building Distribution Voltage System
…7 unchanged lines
```
+### The default building distribution shall be 480Y/277V, 3Φ, 4-wire, 60 Hz, with 208Y/120V derived through transformers for receptacle and small-equipment loads, unless the drawings indicate otherwise.
+
+### Declaring the voltage system once prevents the common coordination failure in which downstream sections each assume a different voltage and the discrepancy is not caught until equipment submittals arrive. {note}
+
## Available Fault Current {toc}
…4 unchanged lines
### Listed equipment and assemblies shall have a short-circuit current rating (SCCR) equal to or greater than the available fault current at the point of installation per NEC 110.10.
−### The available fault current changes when the utility transformer or service conductors change; the value used in the arc-flash and equipment-rating basis shall be the utility-confirmed value, not an assumed maximum. {note}
+### The available fault current changes when the utility transformer or service conductors change; the value used in the arc-flash and equipment-rating basis shall be the utility-confirmed value, not an assumed maximum.
```datasheet
…10 unchanged lines
### A single project-wide conductor color-coding convention shall be established here and applied uniformly across every electrical section.
+```datasheet
+label: Phase Conductor Identification Method
+type: radio
+options:
+ - "Factory-colored insulation full length"
+ - "Colored insulation or colored tape at terminations and accessible points (No. 4 AWG and larger)"
+default: "Colored insulation or colored tape at terminations and accessible points (No. 4 AWG and larger)"
+```
+
### Where 480V and 208V systems coexist in the same facility, the two systems shall use distinct phase color sets so that a 480V phase conductor can never be mistaken for a 208V phase conductor.
−### When both systems use the same color on Phase A, field cross-connection errors become common and are difficult to detect after termination; locking in two distinct color sets at the basis-of-design level is the only reliable prevention. {note}
−
```datasheet
label: 208Y/120V System Phase Colors (A / B / C / Neutral)
…14 unchanged lines
```
−```datasheet
−label: Phase Conductor Identification Method
−type: radio
−options:
− - "Factory-colored insulation full length"
− - "Colored insulation or colored tape at terminations and accessible points (No. 4 AWG and larger)"
−default: "Colored insulation or colored tape at terminations and accessible points (No. 4 AWG and larger)"
−```
+### When both systems use the same color on Phase A, field cross-connection errors become common and are difficult to detect after termination; locking in two distinct color sets at the basis-of-design level is the only reliable prevention. {note}
## Environmental Classifications {toc}
…3 unchanged lines
### A space classified by the mechanical Engineer as a wet location shall not receive equipment in a Type 1 enclosure regardless of its interior location.
−### Specifying Type 1 enclosures in mechanical rooms that are classified as wet locations is a recurrent error; the electrical enclosure schedule must be reconciled against the mechanical space classifications rather than assumed dry by default. {note}
+### Specifying Type 1 enclosures in mechanical rooms that are classified as wet locations is a recurrent error; the electrical enclosure schedule must be reconciled against the mechanical space classifications rather than assumed dry by default.
# Submittals {toc}
…158 unchanged lines
### Enclosures installed in classified hazardous locations shall be Type 7 or Type 9 as appropriate to the area classification.
−### Selecting a less severe enclosure type than the location demands is a code deficiency and a premature-failure risk; the enclosure schedule must therefore be reconciled against the space classifications before procurement. {note}
+### Selecting a less severe enclosure type than the location demands is a code deficiency and a premature-failure risk; the enclosure schedule must therefore be reconciled against the space classifications before procurement.
```datasheet
…138 unchanged lines
### A minimum annular clearance of 1/4 in. (6 mm) shall be maintained around the penetrating item for installation of the firestop material unless the listed system specifies otherwise.
−### Sleeve diameters shown on the structural and electrical drawings shall be reconciled during coordination; undersized sleeves that cannot accommodate the conduit group plus firestop clearance shall be flagged as a conflict before installation. {note}
+### Sleeve diameters shown on the structural and electrical drawings shall be reconciled during coordination; undersized sleeves that cannot accommodate the conduit group plus firestop clearance shall be flagged as a conflict before installation.
```datasheet
…134 unchanged lines
# Warranty {toc}
−## Warranty {toc}
+## The Contractor shall warrant all electrical work against defects in materials and workmanship for a minimum period of one year from the date of substantial completion.
−### The Contractor shall warrant all electrical work against defects in materials and workmanship for a minimum period of one year from the date of substantial completion.
+## Manufacturer warranties on supplied equipment shall be transferred to the Owner and shall run from the date of substantial completion.
−### Manufacturer warranties on supplied equipment shall be transferred to the Owner and shall run from the date of substantial completion.
−
```datasheet
label: Workmanship Warranty Period
…4 unchanged lines
default: "1 year from substantial completion"
```