Short-Circuit and Ground-Fault Protection
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The designations "National Electrical Code” and “NEC” refer to the
National Electrical Code®, which is a registered
trademark of the
National Fire Protection Association.
Top 50 NEC Rules
430.52 Branch-Circuit Short-Circuit
and Ground-Fault Protection
By Mike Holt
The motor branch-circuit short-circuit and ground-fault
protective device must comply with 430.52(B) and 430.52(C). This device
must be capable of carrying the motor's starting current.
Each motor branch circuit must be protected against short-circuit
ground faults by a protection device sized no greater than the
percentages listed in Table 430.52.
Editor's note: This information was extracted from Mike
the National Electrical Code
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What's Wrong Here?
By Joe Tedesco
Think you know how this installation violates the
NEC? Visit EC&M's
Web site to see the answer.
Hint: Strange supports
By Mike Holt
Q. What are the NEC requirements for the
installation of smoke detectors in dwelling units?
Visit EC&M's Web
site to see the answer.
By Steven Owen
Q. On a 3-phase, 4-wire, 277V multi-wire
circuit, which is protected at 20A, there is debate as to the proper
application of 210.4(B) and 240.15(B). The question is whether or not
three single-pole circuit breakers with an identified handle tie are
permitted to serve as both the disconnecting means and the overcurrent
protective device for this circuit, or whether a multi-pole circuit
breaker is required. What is the correct answer?
- Circuit breakers installed with identified handle ties are
to serve as both the disconnecting means and overcurrent protection as
stated in this example.
- Circuit breakers may be installed with or without identified handle
ties to serve as the overcurrent protective device only (not as the
- A multi-pole circuit breaker may serve as both the disconnecting
means and overcurrent protective device.
- All the above are correct answers.
Web site for the answer and explanation.
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Code News Update
Looking for the latest electrical code, enforcement,
contractor/electrician licensing requirements for each state in the
United States? Here's a good starting point. Check out this National
Electrical Installation Standards (NEIS) state-by-state
source listing maintained by the National Electrical Contractors
Association (NECA) Chapters. This valuable list also includes agency
contact information, which offers you the opportunity to make contact
with key members of local enforcement authorities.
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the NEMA 4, 4X (stainless steel) and 12 rating of the enclosure. Web
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It takes more than the UL Mark on a product to satisfy code
requirements. Before your next installation, use UL's Code Compliance
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