I am working on a security gate installation. The electrical cabinet at the gate has 10 amps max loading (120V single phase). It is feed by a 20 amp circuit breaker. Do I have to size the feeder wire to the panel for a voltage drop at 20 amps or can I use the 10 amp loading since it is a dedicated circuit. What code section do I use to justify it with the inspector.
Security Gate Voltage Drop
- Thread starter KKraync
- Start date
- Status
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
KKraync said:
The NEC is quiet on voltage drop in that scenario. There is FPN about VD in note 4 to art 210.19(A)(1). It is a good idea to figure VD regardless.
I would use the 10 amps for calculation purposes
tryinghard
Senior Member
- Location
- California
Size the branch circuit conductor supplying the gate with the gates actual 10A load. With NEC I?d start in Definitions: ?Branch Circuit, Individual?, then 210-19, then 210-21(B)(1), & 210-23.
In this light you can supply the individual load and respect 3% VD, so VD=2x12.9xIxD/CM (Table 8), of course the 3% of 120 V would be 3.6 volts loss.
In this light you can supply the individual load and respect 3% VD, so VD=2x12.9xIxD/CM (Table 8), of course the 3% of 120 V would be 3.6 volts loss.
- Status