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 From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Robert Johnson Sent: Monday, May 05, 2003 10:48 AM To: 'JP Hare'; emc-p...@majordomo.ieee.org Subject: RE: AC outlet max current A noncontinuous load is permitted to use 100% of the circuit rating. Only continuous loads need the derating. Bob Johnson ITE Safety From: owner-emc-p...@majordomo.ieee.org [mailto:owner-emc-p...@majordomo.ieee.org] On Behalf Of JP Hare Sent: Thursday, May 01, 2003 12:20 PM To: Gonzalez, Kenneth P (Rocky); emc-p...@majordomo.ieee.org Subject: RE: AC outlet max current Hi Rocky, Article 210 of the NEC lists the requirements for branch circuits and associated receptacles. Table 210.21(B)(2) shows the receptacle load limits and section 210.23 discusses the permissible loads in more detail. On a related topic, I recently had a discussion with a colleague regarding the plug for a certain North American hand-held hair dryer. The ratings on it are 1875 watts, 125 volts. That puts it right at a 15 amps. However the plug is an ungrounded polarized NEMA 1-15 type with a built in GFIC. This allows it to be plugged into any standard 15 amp receptacle that you find in the US. Knowing the 80% requirement for cord-and-plug-connected loads, I questioned how an NRTL could list this device. It would seem that a 5-20 plug (perpendicular blades) would be necessary so that a 20 amp receptacle would have to be used. Our thoughts ranged from the cynical "money talks" theory to a more logically based engineering justification. (The code says that bathroom receptacles must be on their own 20 amp branch with no other receptacles.) But we never came to a final conclusion on why an NRTL would allow a 15 amp plug-and-cord load to be plugged into a 15 amp receptacle. Maybe our peers on the EMC-PSTC listserv have some ideas? Regards, J.P. Hare This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
