In message <[email protected]>, dated Tue, 28 Oct 2008, "Kunde, Brian" <[email protected]> writes:
>When I read 9.1.4.1, I also think it is referring to the circuit >driving the coil of the relay and not the heater circuit. However, the >inspector is telling me this code is mandating that I cannot have a >solid state relay in the Neutral side of the heater element and I don't >see his interpretation. So I was hoping that someone more familiar >then I with NFPA 79 could help me out. There has been a similar question raised about low-side solid-state relays in UK. In UK, you can't have a switch in the neutral, but a solid-state relay is not classed as a switch, because you must not rely on it to stay in the switched-off state, and it leaks more than a proper switch. So it IS allowed to have one on the neutral side of the load, and almost all low-power light dimmers are also arranged that way. -- OOO - Own Opinions Only. Try www.jmwa.demon.co.uk and www.isce.org.uk Either we are causing global warming, in which case we may be able to stop it, or natural variation is causing it, and we probably can't stop it. You choose! John Woodgate, J M Woodgate and Associates, Rayleigh, Essex UK - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas [email protected] Mike Cantwell [email protected] For policy questions, send mail to: Jim Bacher: [email protected] David Heald: [email protected] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
