Forum Posts

• December 7, 2019 10:22 AM PST

  in the topic ground fault protection in the forum Electrical Engineering

  Ground fault protection of equipment is not allowed per NEC 695.6(G)
• November 17, 2019 12:05 PM PST

  in the topic 60A fuse in the forum Electrical Engineering

  (27A × 1.25) + 14A = 48A 8 AWG rated 50A at 75°C largest branch circuit ground fault and short circuit protective device : 20 hp motor = 27A × 2.50 = 68, next size up = 70A the feeder protection: not more than 70A + 14A, = 84A. Next size down = 80A Therefore, for this specific arrangement, you would use 8 AWG conductor and an 80A breaker.
• October 21, 2019 8:47 PM PDT

  in the topic GFI is not grounded? in the forum Electrical Engineering

  Supplying the circuit with the GFCI must be grounded.
• October 12, 2019 11:15 AM PDT

  in the topic Branch circuit in the forum Electrical Engineering

  Yes, you are allowed.
• October 4, 2019 9:20 PM PDT

  in the topic CB or OCPD rating of the feeder. in the forum Electrical Engineering

  Stacy Littleton said: I'd like to just comment on the CB or OCPD rating of the feeder. The ampacity is determined by the method described, 125% of the anticipated full load. The OCPD then can be selected base on that. For feeders, the standard size value for OCPD can be rounded down from that ampacity rating, not up as required for branch circuits. You are correct the feeder must be sized to have an ampacity at least (minimum) 125% of the load, if it is a continuous load, as stated in 215.2(A)(1)(a). The overcurrent device must also be sized to at least 125% of a continuous load as stated in 215.3. You might be able to round down from the conductor ampacity but it cannot be rated less than 125% of the load, whether or not it is a standard size. These rules are the same for branch circuits in 210.19 and 210.20.