BIL Rating on 600V and Below

[buddy91082]

Anyone know why low voltage transformers rated for 600v and below do not have a BIL rating or that we are not too concerned with the lightning and switching surges at these levels?

Thanks.
b

 

[randyman]

What ratings are you speaking of?? Voltage transformers made to IEEE C57.13 for 600V class (and less) have a 10kV BIL requirement.

 

[buddy91082]

You are right. But when working on 600v and below we don't (or I haven't) really been concerned with the BIL rating compared to working above 600v.