Where experts and professionals share insights and inspirations to grow business and build careers
Avoid feeling tapped out when trying to apply feeder tap rules
Assume I have a 2000A [480v 3ph] breaker feeding a bunch of cables. I attach 3-#24 wires and run for 15,000.0 Ft and termintate at a 1 amp disconnect w/ fuse. [I am assuming a #24 wire is rated for 1 amp] This seems to meet 240 21 B 5.
So, the size of the tap wire can be any size?
I can run 24AWG for 15,000 ft or farther and terminate at a 1amp fuse w/ disconnect mounted outside fed from a 2000A breaker? Really??
I work in the drilling industry where things have been out of code for years and making them so is a constant battle. I recently ran into the following situation:
I discovered 3 devices with electric motors drawing between 12 full load amps and 25 full load amps. Each device has a starter with overloads for motor protection that I assume are sized correctly. Two of the devices are fed with a 4 conductor #10 cable and the third is fed with a 4 conductor #8 cable. These three devices were plugged into two 100 amp service disconnect receptacles and one 60 amp service disconnect receptacle. I told the drilling supervisor that we couldn't continue to run the devices from these disconnects as the device feeder cables were only rated to just over 30 amps. I reran these device feeders so they were fed from 30 amp breakers and one 50 amp breaker(that I turned the trip setting down to 60% getting it below the rated amp level of the feeder cable). The circuits all all 3 phase 480 volt power. A fellow electrician told me it was fine the way it was before because of the starters and overloads. Is he correct? What does the code say about this?
By clicking below, I acknowledge and agree to Penton's Terms of Service
and to Penton's use of my contact information to communicate with me about Penton's or its third-party
partners' products, services, events and research opportunities. Penton's use of the information I
Sponsored Introduction Continue on to (or wait seconds) ×