Voltage rating of bus duct insulators

[urjaengrs]

I have observed one thing regarding insulators of LV busduct in one project. For low voltage busduct connecting transformer and switchboard, I have observed that the voltage rating of insulators is 3.3kV. Why these insulators are up-rated?

Can anybody help me? In advance, Thanks.

 

[magoo2]

They often use higher rated insulators so that the bus duct doesn't become the weak link in the design. It's done to improve the reliability of the bus duct.

 

[urjaengrs]

Dear Friends,

Still I am bit confused regarding rating of insulators. Normally, why bus duct support insulators are up-rated that switchboard insulators?

Please answer............

Thanks in anticipation

 

[LionelHutz]

Maybe that insulator was just the size that worked?

With the little amount of information you have provided it's hard to really say why.