hhsting
Senior Member
- Location
- Glen bunie, md, us
- Occupation
- Junior plan reviewer
I have 4000A main service enclosed circuit breaker listed which has main bonding jumper as bus. The incoming service conductors are 13 sets of 4#500 kcmil which if main bonding jumper were wire requires 900kcmil cable.
Engineer did calculation of bus is copper 1/4”x4”width and area of bus is 1 square inches. 1 square inches to kcmil is 1273 kcmil. So the bus is okay.
I have following questions:
1. I thought manufacturer provided bus does not need calculation. Am I correct or not?
2. If manufacturer are providing bus as main bonding jumper then want if someone provides incoming service conductors any size they want can the manufacturer provided bus size Ever be small if someone connects service conductors oversized? I mean how do we know what the main bonding jumper bus is tested under what maximum incoming service conductor size.
Engineer did calculation of bus is copper 1/4”x4”width and area of bus is 1 square inches. 1 square inches to kcmil is 1273 kcmil. So the bus is okay.
I have following questions:
1. I thought manufacturer provided bus does not need calculation. Am I correct or not?
2. If manufacturer are providing bus as main bonding jumper then want if someone provides incoming service conductors any size they want can the manufacturer provided bus size Ever be small if someone connects service conductors oversized? I mean how do we know what the main bonding jumper bus is tested under what maximum incoming service conductor size.