Richard - Bob Johnson's response on your Q1 is on the money.
wrt your Q2 and "outlet strips", there may be the additional consideration that you may impinge on the scope of UL1363, Relocatable Power Taps (formerly a desk standard for "Temporary Power Taps"), Listed under the CCN XBYS. Point being, the final assembled product may have to comply with UL1363, with the internal measurement device having requirements from UL3111-1. [This was the case for relocatable power taps that incorporated secondary protection for telecommunications circuits, where the latter, internal components were required to comply with UL497A.] Regards, Peter L. Tarver, PE Product Safety Manager Sanmina-SCI Homologation Services San Jose, CA [email protected] > -----Original Message----- > From: Richard Meyette > Sent: Tuesday, April 30, 2002 10:05 AM > > I have a couple of questions regrading the > National Electrical Code: > > 2) Consider the same power measuring circuit > installed into a direct > plug-in (NEMA 5-15P) with a single outlet > receptacle (NEMA 5-15R) or into > an outlet strip with a 16 AWG power cord with > several outlet > receptacles. Assuming that the measuring circuit > is provided with a > suitable fuse for overcurrent protection, are the > outlet receptacles > required to be protected by a 15 A fuse or > circuit breaker in the device or > can they rely on the circuit breaker for the > branch circuit for overcurrent > protection? > > The UL product standard for this device is UL > 3111-1 (Electrical Measuring > and Test Equipment), which is harmonized with IEC > 61010-1, requires an > overcurrent protector to be fitted within the > equipment for all devices > connected to the mains supply (9.6.2). There are > no US deviations in this > standard that would allow the circuit breaker to > provide this protection, > so based on this I would assume that a 15 A > circuit breaker of fuse would > be required for the NEMA 5-15R receptacles. I > would also assume that a 20 > A overcurrent protector would be required for a > NEMA 5-20R outlet receptacle. > > However, the UL product standard for household > appliances (UL 60335-1) does > have a US deviation to a similar requirement for > overcurrent devices (19.1, > Note 2) that states the "The PROTECTIVE DEVICE in > the fixed wiring does not > provide the necessary protection." However, the > US deviation states "The > circuit protection device is permitted to provide > necessary > protection". If I am interpreting this > correctly, a household appliance in > the USA could rely on the panel breaker for > overcurrent protection. Any > comments? > > Thanks in advance for anyone willing to wade > through this and send me a > response. > > Richard A. Meyette. PE > [email protected] > > > > > ------------------------------------------- > 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: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Ron Pickard: [email protected] > Dave Heald: [email protected] > > For policy questions, send mail to: > Richard Nute: [email protected] > Jim Bacher: [email protected] > > All emc-pstc postings are archived and searchable > on the web at: > http://ieeepstc.mindcruiser.com/ > Click on "browse" and then "emc-pstc mailing list" ------------------------------------------- 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: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
