For a 300-ampere electrical circuit, what is the minimum size copper equipment grounding conductor as per NEC?
NEC Table 250.122 4 AWG is the minimum size wire for a 300-ampere circuit
What is the minimum size secondary conductor required for a 2 wire 480 volts/ 120 volts transformer rated at 2.3 KVA with 750C temperature at terminals?
NEC Table 430.248 FLI current of single phase 10 HP motor at 230 volts = 50 amperes NEC 430.22 Minimum conductor ampacity = 50 x 125% = 62.5 amperes NEC…
What is the demand factor applied in calculating feeder or service conductor load for a commercial kitchen having four electrical ovens?
NEC 220.56 Demand factor for kitchen equipment in other than dwelling unit shall be applied according to table 220.56.
What is the minimum size THWN branch circuit conductor required for a 20 HP, 480-volt, 3 Phase Induction type squirrel cage motor with nameplate FLI of 26.5 amps?
NEC Table 430.250 FLI of 20 HP 3 phase motor at 460 volts = 27 amperes NEC 210.20(A) Conductor ampacity = 27 x 1.25 = 33.75 NEC Table 310.15(B)(16) Minimum…
How many 12 AWG conductors are allowed in a 12.5 in round octagonal outlet box?
NEC Table 314.16(A)
What is the corrected ampacity of a 2/0 THWN conductors in a dry location if the ambient temperature of location is 400C?
NEC Table 310.15(B)(16) Conductor ampacity of 2/0 at dry location (900C) = 195 Amperes NEC Table 310.15(B)(2) The correction factor at ambient temperature (450C) = 0.87 Corrected ampacity = 0.87…
True or False: to find a problem in an electrical circuit, block troubleshooting diagrams can be set up for ‘yes’ or ‘no’ questions.
What is the corrected ampacity of a 2/0 THWN conductors in a dry location if the ambient temperature of location is 400C?
NEC Table 310.15(B)(16) Conductor ampacity of 2/0 at dry location (900C) = 195 Amperes NEC Table 310.15(B)(2) The correction factor at ambient temperature (450C) = 0.87 Corrected ampacity = 0.87…
What is the minimum size THWN branch circuit conductor required for a 20 HP, 480-volt, 3 Phase Induction type squirrel cage motor with nameplate FLI of 26.5 amps?
NEC Table 430.250 FLI of 20 HP 3 phase motor at 460 volts = 27 amperes NEC 210.20(A) Conductor ampacity = 27 x 1.25 = 33.75 NEC Table 310.15(B)(16) Minimum…