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I downloaded "A Stitch in Time" from megger.com. Thanks for the suggestion. Looking at Page 11 of that guide, I see the statement, "For many years, maintenence professionals have used the one-megohm rule to establish the lower allowable limit for insulation resistence. The rule may be stated...

*Are these a LV (600V) motors? Yes, LV motors - usually 460VAC or less *What test voltage does your standard give for the hipot test? (2 x line voltage)+1000V. I'll round up to 2000V for 460VAC. *What are the min acceptable values for IR and hipot per your standard? IR - 1M-ohm...

My third-party NRTL is TÜV SÜD America. I am following their requirements which in this case will bring our equipment into compliance with UL, CSA, and CE electrical safety requirements. EN 60204-1 specifies these test criteria. I am testing 3-phase motors and associated line power wiring and...

Hey edison123, the minimum current spec I referred to is that leakage current you mentioned in your reply. If I have an open test lead or a bad connection, the hipot tester will know that and give a fail result. Maybe I should disable this parameter until I get more familiar with hipot...

Hi everybody, I have to perform Ground Bond (GB), Insulation Resistance (IR) and Dielectric Withstand (DW - a.k.a. Hipot) testing on new 3-phase industrial equipment as part of a third-party electrical safety certification. I will soon purchase an Electrical Safety Tester (EST) to perform these...

OK, here's what we've decided to use. All of these wiring connectors are UL and CSA listed. For up to (2) AWG 10, Panduit JN314-412...

Me again - I've been told to look at these 3M lug insulating kits. I thought you might be interested. Thanks again for participating in this thread. steelerr http://solutions.3m.com/wps/portal/3M/en_US/3MElectrical/Home/ProductsServices/Products/?PC_7_0_21K4_nid=DJP8HB7PHMbeCSPPTQMPT8gl

Generally, the NFPA 79 Standard will take precedence over the NEC Code when it comes to machinery. If there is vague language in the Standard (and there are a few cases there), then the NEC is observed. Where there are differences or conflicts between the two, the NFPA 79 Standard applies over...

Thanks for the valuable input. Since my original post, I've come across a couple of commercially-available alternatives to wiring nuts: http://energy.tycoelectronics.com/rrg/raychem_rrg/130.pdf http://www-public.tnb.com/ps/endeca/index.cgi These type connectors takes the skill out of the...

In NFPA 79-2007, Clause 13.5.9.2 states, "Electrical connections at motor terminal boxes shall be made with an identified method of connection. Twist-on wire connections shall not be used for this purpose." What I think this means that wire nuts cannot be used in motor 'peckerheads'. Other...

Fellow group members, I believe I've found the reference I was looking for. The attacked link to Allen-Bradley's Safety Products catalog refers to EN 292-2: 3.7.2 http://www.ab.com/en/epub/catalogs/3377539/5866177/3378082/3384394/ Without actually purchasing the Standard, the second sentence...

I have a copy of NFPA 79 2002 Edition. I assume it's now out of date, correct? I'll hit their website - thanks.

dpc, I see now that Category 3 is a Eurpoean standard, EN 954-1. I wonder if I have to buy a copy of the standard to answer my original question precisely.

Wow, that Siemens document is huge. I'll download it and look it over. Thanks for the link.

Category 3 isn't necessarily a Euro thing. Lots of applications in the US use Category 3 or other level of protection. STI, A-B, Banner and a host of others sell safety monitoring relays and associated components to accomplish this. I was just wondering about the RESET pushbutton. After a...

Is a RESET pushbutton required for Cat. 3, or is that just a "recommendation"? I see lots of examples of the RESET pushbutton in mfg. literature, but no reference to a requirement. I do have the required redundancy, feedback aux. contacts, safety-rated interlock switch and E-Stop pushbutton...