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The code defines "Continuous Load: A load where the maximum current is expected to continue for 3 hours or more." Plug use is not a condition of the definition. I think you will find this is to limit the time and temperature of branch circuit cables and conduit to conditions which will not degrade insulation.
Bob Johnson ITE Safety From: Tyra, John [mailto:john_t...@bose.com] Sent: Wednesday, May 07, 2003 9:13 AM To: 'Robert Johnson'; 'JP Hare'; emc-p...@majordomo.ieee.org Subject: RE: AC outlet max current At what duty cycle???? From: Robert Johnson [mailto:john...@itesafety.com] Sent: Monday, May 05, 2003 10:48 AM To: 'JP Hare'; emc-p...@majordomo.ieee.org Subject: RE: AC outlet max current Hi Bob, Indeed, the code allows 100% of the branch circuit current rating to be used for noncontinuous loads. However, I don't believe this applies to plug-and-cord loads. The NEC seems pretty explicit in this regard. Have you seen an exception to table 210.21(B)(2) and section 210.23(a)? Why would plug-and-cord loads be treated separately if they could be classified as continuous or noncontinuous anyway? Best regards, JP Hare A noncontinuous load is permitted to use 100% of the circuit rating. Only continuous loads need the derating. Bob Johnson ITE SafetyTitle: RE: AC outlet max current
The code defines
"Continuous Load: A load where the maximum current is expected to continue
for 3 hours or more."
Plug use is not a condition of the definition. I think you will find this is
to limit the time and temperature of branch circuit cables and conduit to
conditions which will not degrade insulation.
Bob Johnson
ITE Safety
-----Original Message-----
From: Tyra, John [mailto:john_t...@bose.com]
Sent: Wednesday, May 07, 2003 9:13 AM
To: 'Robert Johnson'; 'JP Hare'; emc-p...@majordomo.ieee.org
Subject: RE: AC outlet max current
At what duty cycle????
-----Original Message-----
From: Robert Johnson [mailto:john...@itesafety.com]
Sent: Monday, May 05, 2003 10:48 AM
To: 'JP Hare'; emc-p...@majordomo.ieee.org
Subject: RE: AC outlet max current
Hi Bob,
Indeed, the code allows 100% of the branch circuit current rating to be used
for noncontinuous loads. However, I don't believe this applies to
plug-and-cord loads. The NEC seems pretty explicit in this regard. Have
you seen an exception to table 210.21(B)(2) and section 210.23(a)?
Why would plug-and-cord loads be treated separately if they could be
classified as continuous or noncontinuous anyway?
Best regards,
JP Hare
A noncontinuous load is permitted to use 100% of the circuit rating. Only
continuous loads need the derating.
Bob Johnson
ITE Safety
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