vault backup: 2026-04-01 18:14:07
This commit is contained in:
+87
-44
@@ -1364,9 +1364,7 @@ Bonding jumpers or conductors and equipment bonding jumpers shall be permitted t
|
||||
|
||||
##### 250.102(E)(1) Inside a Raceway or an Enclosure.
|
||||
|
||||
If installed inside a raceway, equipment bonding jumpers and bonding jumpers or conductors shall comply with the requirements of
|
||||
|
||||
### 250.119 and 250.148.
|
||||
If installed inside a raceway, equipment bonding jumpers and bonding jumpers or conductors shall comply with the requirements of 250.119 and 250.148.
|
||||
|
||||
##### 250.102(E)(2) Outside a Raceway or an Enclosure.
|
||||
|
||||
@@ -1595,27 +1593,27 @@ Exposed, normally non-current-carrying metal parts of cord-and-plug-connected eq
|
||||
|
||||
* (2) Where operated at over 150 volts to ground
|
||||
|
||||
> [!important] Exception No. 1 to (2):
|
||||
> Motors, where guarded, shall not be required to be connected to an equipment grounding conductor.
|
||||
> [!important] Exception No. 1 to (2):
|
||||
> Motors, where guarded, shall not be required to be connected to an equipment grounding conductor.
|
||||
|
||||
> [!important] Exception No. 2 to (2):
|
||||
> Metal frames of electrically heated appliances, exempted by special permission, shall not be required to be connected to an equipment grounding conductor, in which case the frames shall be permanently and effectively insulated from ground.
|
||||
> [!important] Exception No. 2 to (2):
|
||||
> Metal frames of electrically heated appliances, exempted by special permission, shall not be required to be connected to an equipment grounding conductor, in which case the frames shall be permanently and effectively insulated from ground.
|
||||
|
||||
* (3) In residential occupancies:
|
||||
* a. Refrigerators, freezers, and air conditioners
|
||||
* b. Clothes-washing, clothes-drying, and dish-washing machines; ranges; kitchen waste disposers; information technology equipment; sump pumps; and electrical aquarium equipment
|
||||
* c. Hand-held motor-operated tools, stationary and fixed motor-operated tools, and light industrial motor-operated tools
|
||||
* d. Motor-operated appliances of the following types: hedge clippers, lawn mowers, snow blowers, and wet scrubbers
|
||||
* e. Portable handlamps and portable luminaires
|
||||
* a. Refrigerators, freezers, and air conditioners
|
||||
* b. Clothes-washing, clothes-drying, and dish-washing machines; ranges; kitchen waste disposers; information technology equipment; sump pumps; and electrical aquarium equipment
|
||||
* c. Hand-held motor-operated tools, stationary and fixed motor-operated tools, and light industrial motor-operated tools
|
||||
* d. Motor-operated appliances of the following types: hedge clippers, lawn mowers, snow blowers, and wet scrubbers
|
||||
* e. Portable handlamps and portable luminaires
|
||||
|
||||
* (4) In other than residential occupancies:
|
||||
* a. Refrigerators, freezers, and air conditioners
|
||||
* b. Clothes-washing, clothes-drying, and dish-washing machines; information technology equipment; sump pumps; and electrical aquarium equipment
|
||||
* c. Hand-held motor-operated tools, stationary and fixed motor-operated tools, and light industrial motor-operated tools
|
||||
* d. Motor-operated appliances of the following types: hedge clippers, lawn mowers, snow blowers, and wet scrubbers
|
||||
* e. Portable handlamps and portable luminaires
|
||||
* f. Cord-and-plug-connected appliances used in damp or wet locations or by persons standing on the ground, standing on metal floors, or working inside of metal tanks or boilers
|
||||
* g. Tools likely to be used in wet or conductive locations
|
||||
* a. Refrigerators, freezers, and air conditioners
|
||||
* b. Clothes-washing, clothes-drying, and dish-washing machines; information technology equipment; sump pumps; and electrical aquarium equipment
|
||||
* c. Hand-held motor-operated tools, stationary and fixed motor-operated tools, and light industrial motor-operated tools
|
||||
* d. Motor-operated appliances of the following types: hedge clippers, lawn mowers, snow blowers, and wet scrubbers
|
||||
* e. Portable handlamps and portable luminaires
|
||||
* f. Cord-and-plug-connected appliances used in damp or wet locations or by persons standing on the ground, standing on metal floors, or working inside of metal tanks or boilers
|
||||
* g. Tools likely to be used in wet or conductive locations
|
||||
|
||||
> [!important] Exception:
|
||||
> Tools and portable handlamps and portable luminaires likely to be used in wet or conductive locations shall not be required to be connected to an equipment grounding conductor where supplied through an isolating transformer with an ungrounded secondary of not over 50 volts.
|
||||
@@ -1646,31 +1644,31 @@ The equipment grounding conductor run with or enclosing the circuit conductors s
|
||||
* (4) Electrical metallic tubing.
|
||||
|
||||
* (5) Listed flexible metal conduit meeting all the following conditions:
|
||||
* a. The conduit is terminated in listed fittings.
|
||||
* b. The circuit conductors contained in the conduit are protected by overcurrent devices rated at 20 amperes or less.
|
||||
* c. The size of the conduit does not exceed metric designator 35 (trade size 11/4).
|
||||
* d. The combined length of flexible metal conduit, flexible metallic tubing, and liquidtight flexible metal conduit in the same effective ground-fault current path does not exceed 1.8 m (6 ft).
|
||||
* e. If used to connect equipment where flexibility is necessary to minimize the transmission of vibration from equipment or to provide flexibility for equipment that requires movement after installation, a wire-type equipment grounding conductor shall be installed.
|
||||
* a. The conduit is terminated in listed fittings.
|
||||
* b. The circuit conductors contained in the conduit are protected by overcurrent devices rated at 20 amperes or less.
|
||||
* c. The size of the conduit does not exceed metric designator 35 (trade size 11/4).
|
||||
* d. The combined length of flexible metal conduit, flexible metallic tubing, and liquidtight flexible metal conduit in the same effective ground-fault current path does not exceed 1.8 m (6 ft).
|
||||
* e. If used to connect equipment where flexibility is necessary to minimize the transmission of vibration from equipment or to provide flexibility for equipment that requires movement after installation, a wire-type equipment grounding conductor shall be installed.
|
||||
|
||||
* (6) Listed liquidtight flexible metal conduit meeting all the following conditions:
|
||||
* a. The conduit is terminated in listed fittings.
|
||||
* b. For metric designators 12 through 16 (trade sizes 3/8 through 1/2), the circuit conductors contained in the conduit are protected by overcurrent devices rated at 20 amperes or less.
|
||||
* c. For metric designators 21 through 35 (trade sizes 3/4 through 11/4), the circuit conductors contained in the conduit are protected by overcurrent devices rated not more than 60 amperes and there is no flexible metal conduit, flexible metallic tubing, or liquidtight flexible metal conduit in metric designators 12 through 16 (trade sizes 3/8 through 1/2) in the effective ground-fault current path.
|
||||
* d. The combined length of flexible metal conduit, flexible metallic tubing, and liquidtight flexible metal conduit in the same effective ground-fault current path does not exceed 1.8 m (6 ft).
|
||||
* e. If used to connect equipment where flexibility is necessary to minimize the transmission of vibration from equipment or to provide flexibility for equipment that requires movement after installation, a wire-type equipment grounding conductor shall be installed.
|
||||
* a. The conduit is terminated in listed fittings.
|
||||
* b. For metric designators 12 through 16 (trade sizes 3/8 through 1/2), the circuit conductors contained in the conduit are protected by overcurrent devices rated at 20 amperes or less.
|
||||
* c. For metric designators 21 through 35 (trade sizes 3/4 through 11/4), the circuit conductors contained in the conduit are protected by overcurrent devices rated not more than 60 amperes and there is no flexible metal conduit, flexible metallic tubing, or liquidtight flexible metal conduit in metric designators 12 through 16 (trade sizes 3/8 through 1/2) in the effective ground-fault current path.
|
||||
* d. The combined length of flexible metal conduit, flexible metallic tubing, and liquidtight flexible metal conduit in the same effective ground-fault current path does not exceed 1.8 m (6 ft).
|
||||
* e. If used to connect equipment where flexibility is necessary to minimize the transmission of vibration from equipment or to provide flexibility for equipment that requires movement after installation, a wire-type equipment grounding conductor shall be installed.
|
||||
|
||||
* (7) Flexible metallic tubing where the tubing is terminated in listed fittings and meeting the following conditions:
|
||||
* a. The circuit conductors contained in the tubing are protected by overcurrent devices rated at 20 amperes or less.
|
||||
* b. The combined length of flexible metal conduit, flexible metallic tubing, and liquidtight flexible metal conduit in the same effective ground-fault current path does not exceed 1.8 m (6 ft).
|
||||
* a. The circuit conductors contained in the tubing are protected by overcurrent devices rated at 20 amperes or less.
|
||||
* b. The combined length of flexible metal conduit, flexible metallic tubing, and liquidtight flexible metal conduit in the same effective ground-fault current path does not exceed 1.8 m (6 ft).
|
||||
|
||||
* (8) Armor of Type AC cable as provided in 320.108.
|
||||
|
||||
* (9) The copper sheath of mineral-insulated, metal-sheathed cable Type MI.
|
||||
|
||||
* (10) Type MC cable that provides an effective ground-fault current path in accordance with one or more of the following:
|
||||
* a. It contains an insulated or uninsulated equipment grounding conductor in compliance with 250.118(1).
|
||||
* b. The combined metallic sheath and uninsulated equipment grounding/bonding conductor of interlocked metal tape--type MC cable that is listed and identified as an equipment grounding conductor
|
||||
* c. The metallic sheath or the combined metallic sheath and equipment grounding conductors of the smooth or corrugated tube-type MC cable that is listed and identified as an equipment grounding conductor
|
||||
* a. It contains an insulated or uninsulated equipment grounding conductor in compliance with 250.118(1).
|
||||
* b. The combined metallic sheath and uninsulated equipment grounding/bonding conductor of interlocked metal tape--type MC cable that is listed and identified as an equipment grounding conductor
|
||||
* c. The metallic sheath or the combined metallic sheath and equipment grounding conductors of the smooth or corrugated tube-type MC cable that is listed and identified as an equipment grounding conductor
|
||||
|
||||
* (11) Cable trays as permitted in 392.10 and 392.60.
|
||||
|
||||
@@ -1707,13 +1705,13 @@ Equipment grounding conductors 4 AWG and larger shall comply with 250.119(A)(1)
|
||||
|
||||
* (1) An insulated or covered conductor 4 AWG and larger shall be permitted, at the time of installation, to be permanently identified as an equipment grounding conductor at each end and at every point where the conductor is accessible.
|
||||
|
||||
> [!important] Exception:
|
||||
> Conductors 4 AWG and larger shall not be required to be marked in conduit bodies that contain no splices or unused hubs.
|
||||
> [!important] Exception:
|
||||
> Conductors 4 AWG and larger shall not be required to be marked in conduit bodies that contain no splices or unused hubs.
|
||||
|
||||
* (2) Identification shall encircle the conductor and shall be accomplished by one of the following:
|
||||
* a. Stripping the insulation or covering from the entire exposed length
|
||||
* b. Coloring the insulation or covering green at the termination
|
||||
* c. Marking the insulation or covering with green tape or green adhesive labels at the termination
|
||||
* a. Stripping the insulation or covering from the entire exposed length
|
||||
* b. Coloring the insulation or covering green at the termination
|
||||
* c. Marking the insulation or covering with green tape or green adhesive labels at the termination
|
||||
|
||||
#### 250.119(B) Multiconductor Cable.
|
||||
|
||||
@@ -1789,7 +1787,7 @@ If ungrounded conductors are increased in size for any reason other than as requ
|
||||
|
||||
#### 250.122(C) Multiple Circuits.
|
||||
|
||||
A single equipment grounding conductor shall be permitted to be installed for multiple circuits that are installed in the same raceway, cable, trench, or cable tray. It shall be sized from Table 250.122 for the largest overcurrent device protecting circuit conductors in the raceway, cable, trench, or cable tray. Equipment grounding conductors instal led in cable trays shall meet the minimum requirements of
|
||||
A single equipment grounding conductor shall be permitted to be installed for multiple circuits that are installed in the same raceway, cable, trench, or cable tray. It shall be sized from Table 250.122 for the largest overcurrent device protecting circuit conductors in the raceway, cable, trench, or cable tray. Equipment grounding conductors installed in cable trays shall meet the minimum requirements of
|
||||
392.10(B)(1)(c).
|
||||
|
||||
#### 250.122(D) Motor Circuits.
|
||||
@@ -1817,7 +1815,7 @@ For circuits of parallel conductors as permitted in 310.10(G), the equipment gro
|
||||
|
||||
* (a) Single Raceway or Cable Tray, Auxiliary Gutter, or Cable Tray. If circuit conductors are connected in parallel in the same raceway, auxiliary gutter, or cable tray, a single wire-type conductor shall be permitted as the equipment grounding conductor.
|
||||
|
||||
The wire-type equipment grounding conductor shall be sized in accordance with 250.122, based on the overcurrent protective device for the feeder or branch circuit.
|
||||
The wire-type equipment grounding conductor shall be sized in accordance with 250.122, based on the overcurrent protective device for the feeder or branch circuit.
|
||||
|
||||
* (b) Multiple Raceways. If conductors are installed in multiple raceways and are connected in parallel, a wire-type equipment grounding conductor, if used, shall be installed in each raceway and shall be connected in parallel. The equipment grounding conductor installed in each raceway shall be sized in accordance with 250.122 based on the rating of the overcurrent protective device for the feeder or branch circuit.
|
||||
|
||||
@@ -1839,11 +1837,56 @@ The wire-type equipment grounding conductor shall be sized in accordance with 25
|
||||
|
||||
Equipment grounding conductors installed with feeder taps shall not be smaller than shown in Table 250.122 based on the rating of the overcurrent device ahead of the feeder on the supply side ahead of the tap but shall not be required to be larger than the tap conductors.
|
||||
|
||||
%% TODO %%
|
||||
#### Table 250.122 Minimum Size Equipment Grounding Conductors for Grounding Raceway and Equipment
|
||||
|
||||
Note: Where necessary to comply with 250.4(A)(5) or (B)(4), the equipment grounding conductor shall be sized larger than given in this table.
|
||||
| Rating or Setting of Automatic Overcurrent Device in Circuit Ahead of Equipment, Conduit, etc., Not Exceeding (Amperes) | Size (AWG or kcmil) |
|
||||
| ----------------------------------------------------------------------------------------------------------------------- | ------------------- |
|
||||
| **Copper** | |
|
||||
| 15 | 14 |
|
||||
| 20 | 12 |
|
||||
| 60 | 10 |
|
||||
| 100 | 8 |
|
||||
| 200 | 6 |
|
||||
| 300 | 4 |
|
||||
| 400 | 3 |
|
||||
| 500 | 2 |
|
||||
| 600 | 1 |
|
||||
| 800 | 1/0 |
|
||||
| 1000 | 2/0 |
|
||||
| 1200 | 3/0 |
|
||||
| 1600 | 4/0 |
|
||||
| 2000 | 250 |
|
||||
| 2500 | 350 |
|
||||
| 3000 | 400 |
|
||||
| 4000 | 500 |
|
||||
| 5000 | 700 |
|
||||
| 6000 | 800 |
|
||||
| | |
|
||||
| **Aluminum or Copper-Clad Aluminum**<sup>\*</sup> | |
|
||||
| 15 | 12 |
|
||||
| 20 | 10 |
|
||||
| 60 | 8 |
|
||||
| 100 | 6 |
|
||||
| 200 | 4 |
|
||||
| 300 | 2 |
|
||||
| 400 | 1 |
|
||||
| 500 | 1/0 |
|
||||
| 600 | 2/0 |
|
||||
| 800 | 3/0 |
|
||||
| 1000 | 4/0 |
|
||||
| 1200 | 250 |
|
||||
| 1600 | 350 |
|
||||
| 2000 | 400 |
|
||||
| 2500 | 600 |
|
||||
| 3000 | 600 |
|
||||
| 4000 | 750 |
|
||||
| 5000 | 1250 |
|
||||
| 6000 | 1250 |
|
||||
|
||||
\*See installation restrictions in 250.120.
|
||||
Note: Where necessary to comply with 250.4(A)(5) or (B)(4),
|
||||
the equipment grounding conductor shall be sized larger than given in this table.
|
||||
|
||||
<sup>\*</sup>See installation restrictions in [[#250.120 Equipment Grounding Conductor Installation.|250.120]].
|
||||
|
||||
### 250.124 Equipment Grounding Conductor Continuity.
|
||||
|
||||
|
||||
Reference in New Issue
Block a user