[PSES] Fw: new message

Hello! New message, please read Jones Richard - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your

Re: [PSES] OSHA and UL60974-1 Engine Driven Arc Welders

Hi John, My name is Kevin Robinson, and I am the Director of the office that administers the NRTL Program for OSHA. While this response is not an "official" response from OSHA (as I am sending it from my personal account), I would say the same thing if you were to contact me at work (

[PSES] Another question on wire colors

Hi Folks, There's been plenty of discussion here in the past on AC wire colors and neutral. With regards to DC, NFPA 79 and UL 508 A also define BLUE for ungrounded dc control circuits and WHITE with BLUE stripe for grounded dc current-carrying control circuit conductor. EN 60204-1 defines

Re: [PSES] Another question on wire colors

Dave, I think it depends on whether you have an internal neutral derived from the secondary of a control transformer. If you do, and that neutral is bonded to the grounding/earthing connection at the mont of supply, then the DC common could also be identified as a neutral wire IF the DC common

Re: [PSES] OSHA and UL60974-1 Engine Driven Arc Welders

Hi Kevin, Thank you for the detailed clarification!! Best Regards, John From: Kevin Robinson Sent: Thursday, October 8, 2015 2:27 PM To: John Allen Cc: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] OSHA and UL60974-1 Engine

[PSES] OSHA and UL60974-1 Engine Driven Arc Welders

Hi guys, Question on the subject - UL60974-1 (Engine Driven Arc Welders) is not on the OSHA list of "Appropriate Test Standards". UL551 (Transformer Arc Welders) is on the list. No NRTLs have UL60974-1 coverage by OSHA. Can we still use UL60974-1 for USA Certification? Our issue is that