Lauren, The EN 60947-* specifies the tests for Circuit Breakers, Control Switches, Terminal Blocks, ... The test series assumes that only one unprepared conductor will be attached to a terminal unless the manufacturer specifies otherwise. When the manufacturer specifies otherwise, the tests become quite time consuming. Although I can't comment on the relevance of the test series to actual installation conditions, I can tell you that I have seen tests with multiple conductors fail on multiple occasions.
Anyway, connecting more than one conductor (when not specifically allowed) is using a component outside of it's approved (certified) specifications. If you want to quote a specific requirement from the 204, look in Chapter 14, Wiring Practices. Matt > -----Original Message----- > From: [email protected] [mailto:[email protected]]On Behalf > Of Crane, Lauren > Sent: Wednesday, March 15, 2000 5:07 AM > To: '[email protected]' > Subject: Number of connections per terminal - chapter and verse? > > > > Safety minded folk, > > I am stumped finding chapter and verse on the following common sense ideas > (i.e. in what part of which standard are the following issues addressed). > Sometimes the simplest things are the hardest to find! Any corrections would > be appreciated. I generally work in the realm of the NEC (NFPA 70), NFPA 79, > EN 60204 and EN 61010-1 (aka UL3121). If you know of a related section in > one of these I would appreciate the direction. > > 1. Unless explicitly stated otherwise in the manufacturer's documentation, > it is only appropriate to apply one wire to one terminal on a commercial > electrical device such as a contactor or circuit breaker. > > 2. For screw-terminal terminal strips, there should be no more than two ring > or spade lugs, this includes jumper straps between barriers. > > Lauren E. Crane > * Eaton Corporation, SEO > * Ion Beam Systems Division > * Manager - Product Design Safety and Compliance > * [email protected] 978.921-9745 > > > ------------------------------------------- > This message is from the IEEE EMC Society Product Safety > Technical Committee emc-pstc discussion list. > > To cancel your subscription, send mail to: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Jim Bacher: [email protected] > Michael Garretson: [email protected] > > For policy questions, send mail to: > Richard Nute: [email protected] > > >
