Equipment Grounding Conductor for DC Circuits
- Thread starter Charz
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petersonra
Senior Member
- Location
- Northern illinois
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- engineer
The NEC does not care if it is AC or DC. It still needs an EGC. The egc can be metallic conduit rather than a wire.
Julius Right
Senior Member
- Occupation
- Electrical Engineer Power Station Physical Design Retired
NEC Art. 250.162 Direct-Current Circuits and Systems to Be Grounded.
Exception No. 2: A rectifier-derived dc system supplied from an ac system complying with 250.20 shall not be required to be grounded. That means if the rectifier transformer is grounded you don't need EGC for d.c.circuits. However if you needs an EGC you may use a separate conductor:
250.134 Equipment Fastened in Place or Connected by Permanent Wiring Methods (Fixed) — Grounding
Exception No. 2: For dc circuits, the equipment grounding conductor shall be permitted to be run separately from the circuit conductors.
Exception No. 2: A rectifier-derived dc system supplied from an ac system complying with 250.20 shall not be required to be grounded. That means if the rectifier transformer is grounded you don't need EGC for d.c.circuits. However if you needs an EGC you may use a separate conductor:
250.134 Equipment Fastened in Place or Connected by Permanent Wiring Methods (Fixed) — Grounding
Exception No. 2: For dc circuits, the equipment grounding conductor shall be permitted to be run separately from the circuit conductors.
ron
Senior Member
- Location
- New York, 40.7514,-73.9925
Grounding and bonding are different.
Just as an ungrounded "system" needs to have its enclosures and feeders grounded and bonded and run with EGC's, a DC feeder or circuit source ("system") may or may not be required to be grounded, but would still be required to have its non-current carrying metallic enclosures be bonded and feeders / circuits run with and EGC. The EGC may be a wire type or raceway type as listed in 250.118.
See 250.4(A) if you think that the DC source "system" output is grounded OR see 250.4(B) if you think the DC source "system" output is ungrounded.
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