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2025-12-03 17:11:42 -05:00
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nfpa-70_215_feeders.md
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@@ -6,7 +6,7 @@ tags:
- authorship/other
- destiny/uncertain
- exclude-from-word-count
- status/incomplete
- status/draft
- topic/construction/electrical
- type/media
title: Article 215 Feeders
@@ -44,7 +44,6 @@ and shall comply with 110.14(C).
> [!important] Exception No. 3:
> Grounded conductors that are not connected to an overcurrent device shall be permitted to be sized at 100 percent of the continuous and noncontinuous load.
* (b) The minimum feeder conductor size
shall have an ampacity not less than the maximum load to be served
after the application of any adjustment or correction factors
@@ -62,7 +61,10 @@ and shall comply with 110.14(C).
##### 215.2(A)(2) Grounded Conductor.
The size of the feeder circuit grounded conductor shall not be smaller than that required by 250.122, except that 250.122(F) shall not apply where grounded conductors are run in parallel.
The size of the feeder circuit grounded conductor
shall not be smaller than that required by [[nfpa-70_250_grounding#250.122 Size of Equipment Grounding Conductors.|250.122]],
except that [[nfpa-70_250_grounding#250.122(F) Conductors in Parallel.|250.122(F)]]
shall not apply where grounded conductors are run in parallel.
Additional minimum sizes shall be as specified in 215.2(A)(3) under the conditions stipulated.
@@ -77,7 +79,8 @@ The ampacity of conductors shall be in accordance with 310.14 and 311.60 as appl
##### 215.2(B)(1) Feeders Supplying Transformers.
The ampacity of feeder conductors
shall not be less than the sum of the nameplate ratings of the transformers supplied
shall not be less than the sum
of the nameplate ratings of the transformers supplied
when only transformers are supplied.
##### 215.2(B)(2) Feeders Supplying Transformers and Utilization Equipment.
@@ -90,22 +93,37 @@ that will be operated simultaneously.
##### 215.2(B)(3) Supervised Installations.
For supervised installations, feeder conductor sizing shall be permitted to be determined by qualified persons under engineering supervision in accordance with 310.14(B) or 311.60(B). Supervised installations are defined as those portions of a facility where all of the following conditions are met:
For supervised installations, feeder conductor sizing shall be permitted
to be determined by qualified persons under engineering supervision
in accordance with 310.14(B) or 311.60(B).
Supervised installations are defined as those portions of a facility
where all of the following conditions are met:
* (1) Conditions of design and installation are provided under engineering supervision.
* (2) Qualified persons with documented training and experience in over 1000-volt systems provide maintenance, monitoring, and servicing of the system.
* (2) Qualified persons with documented training and experience
in over 1000-volt systems provide maintenance,
monitoring, and servicing of the system.
### 215.3 Overcurrent Protection.
Feeders shall be protected against overcurrent in accordance with Part I of Article 240. Where a feeder supplies continuous loads or any combination of continuous and noncontinuous loads, the rating of the overcurrent device shall not be less than the noncontinuous load plus 125 percent of the continuous load.
Feeders shall be protected against overcurrent
in accordance with [[nfpa-70_240_overcurrent-protection#Part I. General|Part I of Article 240]].
Where a feeder supplies continuous loads
or any combination of continuous and noncontinuous loads,
the rating of the overcurrent device
shall not be less than the noncontinuous load
plus 125 percent of the continuous load.
> [!important] Exception:
> Where the assembly, including the overcurrent devices protecting the feeder(s), is listed for operation at 100 percent of its rating, the ampere rating of the overcurrent device shall be permitted to be not less than the sum of the continuous load plus the noncontinuous load.
> Where the assembly, including the overcurrent devices protecting the feeder(s),
> is listed for operation at 100 percent of its rating,
> the ampere rating of the overcurrent device
> shall be permitted to be not less than the sum of the continuous load
> plus the noncontinuous load.
### 215.4 Feeders with Common Neutral Conductor.
#### 215.4(A) Feeders with Common Neutral.
Up to three sets of 3-wire feeders or two sets of 4-wire or 5-wire feeders shall be permitted to utilize a common neutral.
@@ -116,9 +134,15 @@ Where installed in a metal raceway or other metal enclosure, all conductors of a
### 215.5 Diagrams of Feeders.
If required by the authority having jurisdiction, a diagram showing feeder details shall be provided prior to the installation of the feeders.
If required by the authority having jurisdiction,
a diagram showing feeder details
shall be provided prior to the installation of the feeders.
Such a diagram shall show the area in square feet of the building or other structure supplied by each feeder, the total calculated load before applying demand factors, the demand factors used, the calculated load after applying demand factors, and the size and type of conductors to be used.
Such a diagram shall show the area in square feet
of the building or other structure supplied by each feeder,
the total calculated load before applying demand factors,
the demand factors used, the calculated load after applying demand factors,
and the size and type of conductors to be used.
### 215.6 Feeder Equipment Grounding Conductor.
@@ -127,7 +151,7 @@ in which equipment grounding conductors are required,
the feeder shall include or provide an equipment grounding conductor,
to which the equipment grounding conductors of the branch circuits shall be connected.
Where the feeder supplies a separate building or structure,
the requirements of [[nfpa-70_250_grounding-and-bonding#250.32 Buildings or Structures Supplied by a Feeder(s) or Branch Circuit(s).|250.32]] shall apply.
the requirements of [[nfpa-70_250_grounding#250.32 Buildings or Structures Supplied by a Feeder(s) or Branch Circuit(s).|250.32]] shall apply.
### 215.7 Ungrounded Conductors Tapped from Grounded Systems.
@@ -165,7 +189,6 @@ Feeders shall not be derived from autotransformers unless the system supplied ha
### 215.12 Identification for Feeders.
#### 215.12(A) Grounded Conductor.
The grounded conductor of a feeder, if insulated, shall be identified in accordance with 200.6.
@@ -196,7 +219,7 @@ Where a feeder is supplied from a dc system operating at more than 60 volts, eac
* (1) A continuous red outer finish
* (2) A continuous red stripe durably marked along the conductor’s entire length on insulation of a color other than green, white, gray, or black
* (2) A continuous red stripe durably marked along the conductor's entire length on insulation of a color other than green, white, gray, or black
* (3) Imprinted plus signs (+) or the word POSITIVE or POS durably marked on insulation of a color other than green, white, gray, or black, and repeated at intervals not exceeding 610 mm (24 in.) in accordance with 310.8(B)
@@ -206,8 +229,8 @@ Where a feeder is supplied from a dc system operating at more than 60 volts, eac
* (1) A continuous black outer finish
* (2) A continuous black stripe durably marked along the conductor’s entire length on insulation of a color other than green, white, gray, or red
* (2) A continuous black stripe durably marked along the conductor's entire length on insulation of a color other than green, white, gray, or red
* (3) Imprinted minus signs (–) or the word NEGATIVE or NEG durably marked on insulation of a color other than green, white, gray, or red, and repeated at intervals not exceeding 610 mm (24 in.) in accordance with 310.8(B)
* (3) Imprinted minus signs (--) or the word NEGATIVE or NEG durably marked on insulation of a color other than green, white, gray, or red, and repeated at intervals not exceeding 610 mm (24 in.) in accordance with 310.8(B)
* (4) An approved permanent marking means such as sleeving or shrink-tubing that is suitable for the conductor size, at all termination, connection, and splice points, with imprinted minus signs (–) or the word NEGATIVE or NEG durably marked on insulation of a color other than green, white, gray, or red
* (4) An approved permanent marking means such as sleeving or shrink-tubing that is suitable for the conductor size, at all termination, connection, and splice points, with imprinted minus signs (--) or the word NEGATIVE or NEG durably marked on insulation of a color other than green, white, gray, or red