High Voltage Scheme

[Shaneyj]

Hi guys, I've got a couple of questions combined into one post.

1. Basic insulation level (BIL): if I am specifying a surge arrestor as part of the switching mechanism (a recloser in this case) do I need information from the circuit supplying the gear in order to choose the BIL of the cutouts, insulators, etc? Can I choose the surge arrestor to be rated such that choosing those other components is dependent only upon the arrestor criteria?
2. Porcelain vs polymer - besides weight savings, any thing else to consider? I've yet to get quotes but I'm assuming polymer is more expensive. True? Not true?
3. Is a cutout normally provided for the neutral/ground?
3a. On a utility line, is the grounded conductor referred to as neutral or ground?

Thanks all for the feedback!

 

[petersonra]

Porcelain makes for better targets.

 

[Hv&Lv]

Hi guys, I've got a couple of questions combined into one post.

1. Basic insulation level (BIL): if I am specifying a surge arrestor as part of the switching mechanism (a recloser in this case) do I need information from the circuit supplying the gear in order to choose the BIL of the cutouts, insulators, etc? Can I choose the surge arrestor to be rated such that choosing those other components is dependent only upon the arrestor criteria?
2. Porcelain vs polymer - besides weight savings, any thing else to consider? I've yet to get quotes but I'm assuming polymer is more expensive. True? Not true?
3. Is a cutout normally provided for the neutral/ground?
3a. On a utility line, is the grounded conductor referred to as neutral or ground?

Thanks all for the feedback!

1) The surge arrestor BIL needs to be lower than the other components. It’s basically generic and there is a nice chart in the NESC.
2) porcelain is shrapnel in waiting. Last ones I priced silicone polymer was cheaper.
3) No
3a) Neutral