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2025SU ELC-119-02BL NEC Calculations
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When the selection of the overlod device for a motor is not sufficient for starting a motor of the following (10 Hp, 3 phase, 240V, FLC 23Amps, temperature rise 30 degrees C), the overload device shall be permitted to be increased to 140% of the nameplate FLC of the motor?
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A thermal protector integral with the motor is required to prevent dangerous overheating. Motors greater than 20 amps will be required to be protected by 156% of the FLC given in the Tables 430.248, Table 430.249, and Table 430.250.
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The maximum rating of a inverse time breaker can be increased to what percentage when the minimum size of 115% is insufficient to starting a motor?Note : 150 amp Full Load Current for Motor
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The full load amps, from the nameplate of a 50 HP, 480 volt, 3-phase squirrel cage motor is 62 amps. What should be the maximum rating or setting of the instantaneous trip circuit breaker which provides short-circuit and ground-fault protection to this motor circuit?
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The following motors are connected to a 240 volt, 3-phase, 4-wire feeder. All terminations on this circuit are 75 degree C. (Instantaneous Trip Breakers)
The overload device for the 7.5 HP motor should be selected to trip at:
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The following motors are connected to a 240 volt, 3-phase, 4-wire feeder. All terminations on this circuit are 75 degree C. (Instantaneous Trip Breakers)
The minimum size THHN copper conductors for the feeder of this motor circuit would be:
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The following motors are connected to a 240 volt, 3-phase, 4-wire feeder. All terminations on this circuit are 75 degree C. (Instantaneous Trip Breakers)
If all branch circuit, short-circuit, ground fault protective devices are instantaneous trip breakers, what is the maximum size of the following that can be used for the short-circuit and ground fault protection for the feeder of this circuit?
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The following motors are connected to a 240 volt, 3-phase, 4-wire feeder. All terminations on this circuit are 75 degree C.
A dual element time delay fuse is to be installed on the 5 HP motor branch circuit. It should have a maximum ampere rating of :
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Where the overload relay of a motor starter will not allow a motor with a marked service factor of 1.15 to start under load, it may be increased to a maximum of:
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The full load current for a 2HP, 230 volt, single-phase motor would be:
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