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vault backup: 2026-04-16 17:07:54

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Zane Meyers
2026-04-16 17:07:54 -04:00
parent 901925883d
commit 7036c0f542
16 changed files with 266 additions and 44 deletions
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nfpa-70_110_requirements.md
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@@ -308,9 +308,7 @@ In other than dwelling units, in addition to the requirements in 110.16(A), a pe
> ANSI Z535.4-2011, Product Safety Signs and Labels, provides guidelines for the design of safety signs and labels for application to products.
> [!info] Informational Note No. 3:
> Acceptable industry practices for equipment labeling are described in NFPA 70E-2018, Standard for Electrical
Safety in the Workplace. This standard provides specific criteria for developing arc-flash labels for equipment that provides nominal system voltage, incident energy levels, arc-flash boundaries, minimum required levels of personal protective equipment, and so forth.
> Acceptable industry practices for equipment labeling are described in NFPA 70E-2018, Standard for Electrical Safety in the Workplace. This standard provides specific criteria for developing arc-flash labels for equipment that provides nominal system voltage, incident energy levels, arc-flash boundaries, minimum required levels of personal protective equipment, and so forth.
### 110.18 Arcing Parts.
@@ -356,7 +354,8 @@ Reconditioned equipment shall be identified as "reconditioned" and the original
Where caution, warning, or danger signs or labels are required by this Code, the labels shall meet the following requirements:
* (1) The marking shall warn of the hazards using effective words, colors, symbols, or any combination thereof.
* (1) The marking shall warn of the hazards
using effective words, colors, symbols, or any combination thereof.
> [!info] Informational Note:
> ANSI Z535.4-2011, Product Safety Signs and Labels, provides guidelines for suitable font sizes, words, colors, symbols, and location requirements for labels.
@@ -799,9 +798,9 @@ Doors shall be equipped with locks, and doors shall be kept locked, with access
Where a transformer is installed in a vault as required by Article 450, the vault shall be constructed in accordance with the requirements of Part III of Article 450.
> [!info] Informational Note No. 1:
> For additional information, see ANSI/ASTM E119-2018a, Method for Fire Tests of Building Construction and
Materials, and NFPA 80-2019, Standard for Fire Doors and Other Opening Protectives.
> For additional information, see ANSI/ASTM E119-2018a,
> Method for Fire Tests of Building Construction and Materials,
> and NFPA 80-2019, Standard for Fire Doors and Other Opening Protectives.
> [!info] Informational Note No. 2:
> A typical 3-hour construction is 150 mm (6 in.) thick reinforced concrete.
@@ -945,17 +944,12 @@ The points of control shall be located so that persons are not likely to come in
Unguarded live parts above working space shall be maintained at elevations not less than required by Table 110.34(E).
Table 110.34(E) Elevation of Unguarded Live Parts
Table 110.34(E) Elevation of Unguarded Live Parts Above Working Space
Above Working Space
Nominal Voltage
Between Phases
Elevation m ft
1001--7500 V 2.7 9
7501--35,000 V 2.9 9 ft 6 in.
| Nominal Voltage Between Phases | Elevation |
| ------------------------------ | ----------------- |
| 1001--7500 V | 2.7m (9 ft) |
| 7501--35,000 V | 2.9m (9 ft 6 in.) |
Over 35 kV Add 9.5 mm per kV above 35 kV