wtucker
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What are the criteria for rating flexible cords for extra hard service vs. hard service, and where does this definition appear? I don't find the definition in the NEC, is it a UL thing?
Hard service v. extra hard service usage
- Thread starter wtucker
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rick5280
Senior Member
Re: Hard service v. extra hard service usage
I'm not sure about the critera for the ratings, but this is covered in Article 400, and Table 400.4. An example is SO cord, which is rated extra-hard service, while an SJ cord is not.
Rick Miell
[ September 30, 2003, 01:50 PM: Message edited by: rick5280 ]
I'm not sure about the critera for the ratings, but this is covered in Article 400, and Table 400.4. An example is SO cord, which is rated extra-hard service, while an SJ cord is not.
Rick Miell
[ September 30, 2003, 01:50 PM: Message edited by: rick5280 ]
wtucker
Senior Member
- Location
- Connecticut
Re: Hard service v. extra hard service usage
One would hope they'd define it: There ought to be some parameters, like conductivity, flexibility, abrasion resistance, compression resistance, temperature resistance, something! For example, does a 200-lb. person stepping on a cord constitute hard service or extra hard service? Or does extra hard service allow for a cord to be run over by a triaxle on 3/4" processed stone at 40 below zero?
One would hope they'd define it: There ought to be some parameters, like conductivity, flexibility, abrasion resistance, compression resistance, temperature resistance, something! For example, does a 200-lb. person stepping on a cord constitute hard service or extra hard service? Or does extra hard service allow for a cord to be run over by a triaxle on 3/4" processed stone at 40 below zero?
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