Contradiction?

[Hv&Lv]

Maybe I’m missing something as I’m not as day to day experienced as most on here..
Aren’t all Class 1 cables required to meet insulation requirements for 600V?

 

[petersonra]

Maybe I’m missing something as I’m not as day to day experienced as most on here..
Aren’t all Class 1 cables required to meet insulation requirements for 600V?

I think the rule is that class 1 circuits have to be under 600 volts, but I don't recall that class 1 conductors have to have 600 volt insulation.

 

[EC Dan]

725.49(B) on Class 1 circuit conductors is very clear:

Insulation on conductors shall be rated for the system voltage and not less than 600 volts.

 

[augie47]

725.49 (B) Insulation. Insulation on conductors shall be rated for the system voltage and not less than 600 volts.


(oopps sorry Dan typing as you posted)

 

[petersonra]

725.49(B) on Class 1 circuit conductors is very clear:

That would seem to be pretty clear.

 

[Hv&Lv]

I forgot to add the picture when I made the original post and ran out the door.
I got to looking at this on another thread regarding this wiring on a Generac. This is straight out of the Generac instruction manual.
This section out of the instruction manual and the article posted above are sort of the reason for my confusion and the reason I’m wondering if I am missing something

 

[retirede]

View attachment 2559397

I forgot to add the picture when I made the original post and ran out the door.
I got to looking at this on another thread regarding this wiring on a Generac. This is straight out of the Generac instruction manual.
This section out of the instruction manual and the article posted above are sort of the reason for my confusion and the reason I’m wondering if I am missing something

Meeting the NEC requirement of 600V min also satisfies the Generac instructions. No problem!

 

[Hv&Lv]

Meeting the NEC requirement of 600V min also satisfies the Generac instructions. No problem!

The instructions say rated for minimum 300V in the first sentence.
so 300V or 600V?

 

[EC Dan]

600 V. If you want to understand the contradiction in the instructions then I would contact the manufacturer.

 

[Hv&Lv]

600 V. If you want to understand the contradiction in the instructions then I would contact the manufacturer.

600V is what my understanding is also and was when I read that statement.
I really don’t care enough to fix the manufacturers instructions.

 

[retirede]

The instructions say rated for minimum 300V in the first sentence.
so 300V or 600V?

As a general rule, when it comes to mfgr’s instructions vs NEC, the most restrictive takes precedence, so 600V.