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Assuming the can lights is all that will be on this 15 amp 120 volt circuit and each one has no more than a 75 watt bulb installed you can install up to 19. This is determined by multiplying the amps x the voltage to get the wattage. 15 x 120 = 1800. Then multiply the 1800 x 80% and you get 1440 which places an 80% load on the circuit which is all you safely want. You then divide the 1440 by 75 which is the wattage of each bulb and you get 19.2. You could add more if you use fluorescent bulbs but someone could come along later and install incandescent bulbs and overload the circuit. So stick with no more that 19 to be safe. Remember this is a 15 amp ciruit so you must use AWG # 14 wire and not #12. If you use AWG #12 and a 20 amp breaker you can have 25 can lights with 75 watt bulbs on the circuit.
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How many electrical outlet can be install to a 30amps breaker?
A 30 amp breaker is usually used for a dedicated 30 amp device. Ordinary 15 amp receptacles can not be connected to a breaker of higher trip capacity than the rating of the receptacle. The wire size for a 30 amp breaker is #10 AWG.
Can you use a 2 pole 60 amp breaker to feed one circuit?
No, you cannot use one in place of the other.
Is it ok to run three 240 on one 50 amp breaker?
If you are asking, can three separate 240 volt circuits be run off of one 50 amp breaker then the answer is no. Not without knowing what the loading of the three circuits are and whether all three circuits could be on at the same time.
How many 20amp outlets in commercial building per circuit?
All depends on how big your main breaker is and what size wire you are using,one 20 amp outlet needs #12 wire not more than 50feet away from main breaker
What size breaker is needed to supply a sub panel that is feeding a range and dryer?
If there is a possibility of both operating simultaneously, then a 100 amp breaker (actually 80 amp if you can find one), and appropriate wiring would be required. Even if they were not expected to operate simultaneously, it would be prudent to wire as if they were.
