mayanees
Senior Member
- Location
- Westminster, MD
- Occupation
- Electrical Engineer and Master Electrician
My question concerns the NEC requirements for tapping a circuit breaker output terminal for use in a metering application.
We're specifying metering throughout a facility where CTs will be installed at power panels.
If the panel has a spare breaker, it will be used for the voltage input to the meter. But in the case where there are no spares, we'll need to terminate the ~18 AWG tap wire for the meter on some voltage source. (it will be fused to comply with tap rules)
If the mains have 2/0 terminations, it would be easy to slip the ~18 AWG wire under the terminal and retighten, but I'm concerned that the terminal would have to be listed for that application.
Can anyone speak to that?
One alternative would be to intercept an output low-amperage feeder with a tap block and run the PT leads from there. But it would be so much easier to tap a CB output terminal.
Any comments or suggestions are appreciated.
We're specifying metering throughout a facility where CTs will be installed at power panels.
If the panel has a spare breaker, it will be used for the voltage input to the meter. But in the case where there are no spares, we'll need to terminate the ~18 AWG tap wire for the meter on some voltage source. (it will be fused to comply with tap rules)
If the mains have 2/0 terminations, it would be easy to slip the ~18 AWG wire under the terminal and retighten, but I'm concerned that the terminal would have to be listed for that application.
Can anyone speak to that?
One alternative would be to intercept an output low-amperage feeder with a tap block and run the PT leads from there. But it would be so much easier to tap a CB output terminal.
Any comments or suggestions are appreciated.