600v wire ?

[dm9289]

This may be a foolish question but is it safe to assume 600v wire is good for both 600v Ac and DC. I have always seen the 600 v rating and was not sure

 

[don_resqcapt19]

Yes, the 600 volts for ac is really 848 volts peak to peak, and the dc is a steady voltage.

 

[dm9289]

Yes, the 600 volts for ac is really 848 volts peak to peak, and the dc is a steady voltage.

Thanks I think I over thought cause sometimes I see disconnects marked 600vac/250vdc

 

[jim dungar]

Thanks I think I over thought cause sometimes I see disconnects marked 600vac/250vdc

That has to do with the arcing across the contacts as the switch opens, not the voltage while it is closed.

 

[don_resqcapt19]

Thanks I think I over thought cause sometimes I see disconnects marked 600vac/250vdc

It is more difficult to break an ac circuit than a dc circuit (no zero crossing to help break the current in dc) so, it either has a lower voltage rating, or it will be a 3 phase disconnect telling you to loop one leg of the dc through two poles of the disconnect.

EDIT to correct. It is more difficult to break an ac circuit

 

[dm9289]

That has to do with the arcing across the contacts as the switch opens, not the voltage while it is closed.

Thank you Jim. I just kept over thinking. As many DC arc chutes I deal with I should have thought that.

 

[dm9289]

It is more difficult to break an ac circuit than a dc circuit (no zero crossing to help break the current in dc) so, it either has a lower voltage rating, or it will be a 3 phase disconnect telling you to loop one leg of the dc through two poles of the disconnect.

Thanks again Don it’s appreciated.

 

[infinity]

It is more difficult to break an ac circuit than a dc circuit (no zero crossing to help break the current in dc) so, it either has a lower voltage rating, or it will be a 3 phase disconnect telling you to loop one leg of the dc through two poles of the disconnect.

Don, did you meant more difficult to break a DC circuit?

 

[don_resqcapt19]

Don, did you meant more difficult to break a DC circuit?

I sure did Thanks