vault backup: 2025-12-03 17:11:42
This commit is contained in:
@@ -6,7 +6,7 @@ tags:
|
||||
- authorship/other
|
||||
- destiny/uncertain
|
||||
- exclude-from-word-count
|
||||
- status/incomplete
|
||||
- status/draft
|
||||
- topic/construction/electrical
|
||||
- type/media
|
||||
title: Article 210 Branch Circuits
|
||||
@@ -23,7 +23,7 @@ This article provides the general requirements for branch circuits.
|
||||
|
||||
Table 210.3 lists references for specific equipment and applications not located in Chapters 5, 6, and 7 that amend or supplement the requirements of this article.
|
||||
|
||||
Table 210.3 Specific-Purpose Branch Circuits
|
||||
#### Table 210.3 Specific-Purpose Branch Circuits
|
||||
|
||||
| Equipment | Article | Section |
|
||||
| --------------------------------------------------------------------------- | ------- | --------------------- |
|
||||
@@ -37,6 +37,13 @@ Table 210.3 Specific-Purpose Branch Circuits
|
||||
| Motors, motor circuits, and controllers | 430 | |
|
||||
| Switchboards and panelboards | | 408.52 |
|
||||
|
||||
%%
|
||||
* [[nfpa-70_440_hvac-equipment#440.6 Ampacity and Rating.]]
|
||||
* [[nfpa-70_440_hvac-equipment#440.31 General.]]
|
||||
* [[nfpa-70_440_hvac-equipment#440.32 Single Motor-Compressor.]]
|
||||
* [[nfpa-70_430_motors]]
|
||||
%%
|
||||
|
||||
### 210.4 Multiwire Branch Circuits.
|
||||
|
||||
#### 210.4(A) General.
|
||||
@@ -453,21 +460,15 @@ All 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlets
|
||||
* c. The first outlet box in the branch circuit shall be marked to indicate that it is the first outlet of the circuit.
|
||||
* d. The combination of the branch-circuit overcurrent device and outlet branch-circuit AFCI shall be identified as meeting the requirements for a system combination-type AFCI and shall be listed as such.
|
||||
|
||||
* (5) If metal raceway, metal wireways, metal auxiliary gutters, or Type MC, or Type AC cable meeting the applicable requirements of
|
||||
250.118, with metal boxes, metal conduit bodies, and metal enclosures are installed for the portion of the branch circuit between the branch-circuit overcurrent device and the first outlet, it shall be permitted to install a listed outlet branch-circuit-type AFCI at the first outlet to provide protection for the remaining portion of the branch circuit.
|
||||
* (5) If metal raceway, metal wireways, metal auxiliary gutters, or Type MC, or Type AC cable meeting the applicable requirements of 250.118, with metal boxes, metal conduit bodies, and metal enclosures are installed for the portion of the branch circuit between the branch-circuit overcurrent device and the first outlet, it shall be permitted to install a listed outlet branch-circuit-type AFCI at the first outlet to provide protection for the remaining portion of the branch circuit.
|
||||
|
||||
* (6) Where a listed metal or nonmetallic conduit or tubing or Type MC cable is encased in not less than 50 mm (2 in.) of concrete for the portion of the branch circuit between the branch-circuit overcurrent device and the first outlet, it shall be permitted to install a listed outlet branch-circuit-type AFCI at the first outlet to provide protection for the remaining portion of the branch circuit.
|
||||
|
||||
> [!important] Exception:
|
||||
> AFCI protection shall not be required for an individual branch circuit supplying a fire alarm system installed in accordance with 760.41(B) or 760.121(B). The branch circuit shall be installed in a metal raceway, metal auxiliary gutter, steel-armored cable, Type
|
||||
|
||||
MC or Type AC, meeting the applicable requirements of 250.118, with metal boxes, conduit bodies, and enclosures.
|
||||
> AFCI protection shall not be required for an individual branch circuit supplying a fire alarm system installed in accordance with 760.41(B) or 760.121(B). The branch circuit shall be installed in a metal raceway, metal auxiliary gutter, steel-armored cable, Type MC or Type AC, meeting the applicable requirements of 250.118, with metal boxes, conduit bodies, and enclosures.
|
||||
|
||||
> [!info] Informational Note No. 1:
|
||||
> For information on combination-type and branch/feeder-type arc-fault circuit interrupters, see UL 1699-2011,
|
||||
|
||||
Standard for Arc-Fault Circuit Interrupters. For information on outlet branch-circuit type arc-fault circuit interrupters, see UL Subject
|
||||
1699A, Outline of Investigation for Outlet Branch Circuit Arc-Fault Circuit-Interrupters. For information on system combination AFCIs, see UL Subject 1699C, Outline of Investigation for System Combination Arc-Fault Circuit Interrupters.
|
||||
> For information on combination-type and branch/feeder-type arc-fault circuit interrupters, see UL 1699-2011, Standard for Arc-Fault Circuit Interrupters. For information on outlet branch-circuit type arc-fault circuit interrupters, see UL Subject 1699A, Outline of Investigation for Outlet Branch Circuit Arc-Fault Circuit-Interrupters. For information on system combination AFCIs, see UL Subject 1699C, Outline of Investigation for System Combination Arc-Fault Circuit Interrupters.
|
||||
|
||||
> [!info] Informational Note No. 2:
|
||||
> See 29.6.3(5) of NFPA 72-2013, National Fire Alarm and Signaling Code, for information related to secondary power-supply requirements for smoke alarms installed in dwelling units.
|
||||
@@ -478,14 +479,10 @@ Standard for Arc-Fault Circuit Interrupters. For information on outlet branch-ci
|
||||
#### 210.12(B) Dormitory Units.
|
||||
|
||||
All 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlets and devices installed in dormitory unit bedrooms, living rooms, hallways, closets, bathrooms, and similar rooms shall be protected by any of the means described in 210.12(A)(1) through (6).
|
||||
210.12(C) Guest Rooms, Guest Suites, and Patient Sleeping Rooms in Nursing Homes and Limited-Care
|
||||
|
||||
Facilities.
|
||||
210.12(C) Guest Rooms, Guest Suites, and Patient Sleeping Rooms in Nursing Homes and Limited-Care Facilities.
|
||||
|
||||
All 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlets and devices installed in guest rooms and guest suites of hotels and motels and patient sleeping rooms in nursing homes and limited-care facilities shall be protected by any of the means described in 210.12(A)(1) through (6).
|
||||
210.12(D) Branch Circuit Extensions or Modifications --- Dwelling Units, Dormitory Units, and Guest
|
||||
|
||||
Rooms and Guest Suites.
|
||||
210.12(D) Branch Circuit Extensions or Modifications --- Dwelling Units, Dormitory Units, and Guest Rooms and Guest Suites.
|
||||
|
||||
Where branch circuit wiring for any of the areas specified in 210.12(A), (B), or (C) is modified, replaced, or extended, the branch circuit shall be protected by one of the following:
|
||||
|
||||
@@ -494,8 +491,7 @@ Where branch circuit wiring for any of the areas specified in 210.12(A), (B), or
|
||||
* (2) A listed outlet branch-circuit-type AFCI located at the first receptacle outlet of the existing branch circuit
|
||||
|
||||
> [!important] Exception:
|
||||
> AFCI protection shall not be required where the extension of the existing branch circuit conductors is not more than 1.8 m
|
||||
(6 ft) and does not include any additional outlets or devices, other than splicing devices. This measurement shall not include the conductors inside an enclosure, cabinet, or junction box.
|
||||
> AFCI protection shall not be required where the extension of the existing branch circuit conductors is not more than 1.8 m (6 ft) and does not include any additional outlets or devices, other than splicing devices. This measurement shall not include the conductors inside an enclosure, cabinet, or junction box.
|
||||
|
||||
### 210.13 Ground-Fault Protection of Equipment.
|
||||
|
||||
@@ -553,7 +549,7 @@ shall determine the circuit rating.
|
||||
Branch-circuit conductors shall have an ampacity
|
||||
not less than the larger of 210.19(A)(1)(a) or (A)(1)(b)
|
||||
and comply with
|
||||
[[nfpa-70_110_requirements-for-electrical-installations#110.14(C) Temperature Limitations.|110.14(C)]]
|
||||
[[nfpa-70_110_requirements#110.14(C) Temperature Limitations.|110.14(C)]]
|
||||
for equipment terminations.
|
||||
|
||||
* (a) Where a branch circuit supplies continuous loads
|
||||
@@ -594,8 +590,7 @@ Branch-circuit conductors supplying household ranges, wall-mounted ovens, counte
|
||||
|
||||
##### 210.19(A)(4) Other Loads.
|
||||
|
||||
Branch-circuit conductors that supply loads other than those specified in 210.3 and other than cooking appliances as covered in
|
||||
210.19(A)(3) shall have an ampacity sufficient for the loads served and shall not be smaller than 14 AWG.
|
||||
Branch-circuit conductors that supply loads other than those specified in 210.3 and other than cooking appliances as covered in 210.19(A)(3) shall have an ampacity sufficient for the loads served and shall not be smaller than 14 AWG.
|
||||
|
||||
> [!important] Exception No. 1:
|
||||
> Tap conductors shall have an ampacity sufficient for the load served. In addition, they shall have an ampacity of not less than 15 for circuits rated less than 40 amperes and not less than 20 for circuits rated at 40 or 50 amperes and only where these tap conductors supply any of the following loads:
|
||||
@@ -615,11 +610,13 @@ Branch-circuit conductors that supply loads other than those specified in 210.3
|
||||
|
||||
#### 210.19(B) Branch Circuits Over 600 Volts.
|
||||
|
||||
The ampacity of conductors shall be in accordance with 310.14 and 311.60, as applicable. Branch-circuit conductors over 600 volts shall be sized in accordance with 210.19(B)(1) or (B)(2).
|
||||
The ampacity of conductors shall be in accordance with 310.14 and 311.60, as applicable.
|
||||
Branch-circuit conductors over 600 volts shall be sized in accordance with 210.19(B)(1) or (B)(2).
|
||||
|
||||
##### 210.19(B)(1) General.
|
||||
|
||||
The ampacity of branch-circuit conductors shall not be less than 125 percent of the designed potential load of utilization equipment that will be operated simultaneously.
|
||||
The ampacity of branch-circuit conductors
|
||||
shall not be less than 125 percent of the designed potential load of utilization equipment that will be operated simultaneously.
|
||||
|
||||
##### 210.19(B)(2) Supervised Installations.
|
||||
|
||||
@@ -1225,7 +1222,7 @@ shall be located within the same room or area as the service equipment.
|
||||
##### 210.63(B)(2) Indoor Equipment Requiring Dedicated Equipment Spaces.
|
||||
|
||||
Where equipment, other than service equipment,
|
||||
requires dedicated equipment space as specified in [[nfpa-70_110_requirements-for-electrical-installations#110.26(E) Dedicated Equipment Space.|110.26(E)]],
|
||||
requires dedicated equipment space as specified in [[nfpa-70_110_requirements#110.26(E) Dedicated Equipment Space.|110.26(E)]],
|
||||
the required receptacle outlet shall be located
|
||||
within the same room or area as the electrical equipment
|
||||
and shall not be connected to the load side of the equipment's branch-circuit disconnecting means.
|
||||
|
||||
Reference in New Issue
Block a user