5kv bus bar question 1

[kvar]

have been trying to find info on 5kv bus bar spacing insulated and non insulated. age tends to confuse recall. any help appreciated.

 

[BraJacTech]

I don't have a documented reference for this other than what I was told by a switchgear tech. The enclosed bus in a metal clad switchgear, uninsulated, requires about 1" per kV to ground. So on a Wye connected 4.16kV (5kV) system, you would require 2.4" of clearance from the bus to ground.

Hope that helps.

 

[matwong]

Dear kvar,
Over here, we are referring to BS159 where the minimum clearance between phases in air for 3.3kV & 6.6kV are 2" and 3.5" respectively. Sorry, no reference on 5kV for you.

 

[DanDel]

ANSI C37.32-1972 Table 8 lists 4.76kV Indoor Air Switches and Bus Supports Phase Spacing as 9" for insulator centerline-to-centerline for classes A10, A20, A30, and B40, and 4.5" metal-to-metal clearances.