forwarding for [email protected] ____________________Forward Header_____________________ Subject: FW: UL1950 - Clause 2.5.5 Author: " Peter Tarver <[email protected]>" List-Post: [email protected] Date: 11/7/00 1:25 PM
-----Original Message----- From: Tarver, Peter [SC1:9031:EXCH] Sent: Tuesday, November 07, 2000 7:42 AM To: [email protected] Subject: RE: UL1950 - Clause 2.5.5 Imagine my surprise that an NRTL is asking this question ;> Since the product is only intended for sale in the US, the NEC accepts green insulated equipment grounding conductor insulation in power supply cords [refer to USNEC Section 400-23(b)] and considering that UL wouldn't turn away a client for US only certification that used a Listed cordset, it shouldn't be a big issue for you, either. Perhaps you can make mention of a relaxation of the requirement in your descriptive report, citing the NEC reference. BTW, I've cut open cords and found green/yellow insulation on the earthing conductor. Regards, Peter L. Tarver, PE [email protected] -----Original Message----- From: Loop, Robert [mailto:[email protected]] Sent: Monday, November 06, 2000 7:53 AM Group, We are looking at a Class 1, cord connected product that utilizes a NEMA 5-15P plug on one end and is wired to a non-service accessible terminal block in the rear of the unit with a Recognized compression fitting for strain relief. The product is being evaluated against UL1950. Here's the problem: The manufacturer only wants to sell the product in the USA and is using a UL listed cordset with US color code (black/white/green). Clause 2.5.5 requires that the ground wire be bare or green with a yellow stripe. They have expressed an unwillingness to change out the cordset claiming ( in which my experience agrees) that no one sells a cordset with black/white/green-yellow color code. In order to meet the letter of the clause, we could require them to strip the 1-1/2 " portion of the green wire that extends past the outer jacketing, but it seems like a backhanded way of meeting the Clause (does the bare wire make the product any safer?). I remember some clause in 1950 making reference to installing the product "in accordance with the national wiring rules", but can't seem to locate it. If that's the case, and the NEC does recognize the black/white/green color code, what's the best answer to resolve this? Your engineering expertise and enlightenment is always welcomed. Sincerely, Robert Loop Engineering Supervisor Wyle Laboratories Product Safety ph - (256) 837-4411 x313 fax- (256) 721-0144 e-mail: [email protected] ------------------------------------------- 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]
