CT meter bonding

[buck33k]

CT can ahead of the service disconnect.

Meter base is connected to the CT can with 1 1/4" RMC with bonding locknut through non-concentric hole in the CT can.

The RMC enters the meter base through a concentric or eccentric KO so as to impair the electrical connection to ground.

How would the meter be bonded to the grounded service conductor? 250.66? This might require quite a large conductor.

 

[Buck Parrish]

Have you thought about useing a bonding bushing?

 

[nakulak]

around here that's a quagmire, I ask the inspector first, because the poco's generally won't allow a ground wire from CT to meterbase unless its on the outside of the can. on the disco side of the CT its all yours so bonding bushings are allowed. but it varies.

 

[buck33k]

Have you thought about useing a bonding bushing?

Yes that would be no problem using a larger nipple. The meter bases come with concentric KOs. This is'nt something I'm actually dealing with but was just something I was wondering about. Might be standard practice to just open KO to full size and bond as you suggested.

 

[Buck Parrish]

No, you don't need to open all the concentric knockouts and use a bigger nipple.
What I was talking about bonds the RMC and the can.
The bonding bushing will have a lug on it. Use a jumper from their to the can.
You may have been thinking about a grounding lock nut. Then you would have to use a bigger nipple. But that wouldn't be prudent.

 

[tom baker]

I have done some CT metering for our local POCO and the bonding is per their standards, using a 10 AWG. Actually they wire up the CTS, we just install the can, conduit, line and load side conductors.