2006-11-03 16:57:14 · 6 answers · asked by satheesh k 1 in Science & Mathematics ➔ Engineering
Add the loads in amperes of each of the appliances on that circuit. Make sure that the total is less than the ampere rating of the circuit breaker. You should probably only use about 3/4 of the amperes the circuit breaker is rated for. For example, a 20 Amp breaker should only be loaded with about 15 Amps.
If only the wattage of an appliance is given, divide the wattage by the voltage to obtain the amperes. For example, a toaster may draw 1200 watts. 1200 watts / 120 V = 10 Amps. A light bulb may draw 60 watts. 60 watts / 120 V = .5 Amps.
2006-11-03 17:09:26 · answer #1 · answered by DavidNH 6 · 1⤊ 0⤋
Circuit Breaker Rating Calculation
2016-12-16 13:24:57 · answer #2 · answered by paschal 4 · 0⤊ 0⤋
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No. The steady-state rating has no correlation on the short circuit capacity. Circuit breakers (of a given rated current) can be purchased with various short circuit capacities. In general, the higher the short circuit rating, the more expensive the breaker. You need to select breakers (and other components) with a fault duty rating that exceeds the maximum available short circuit current.
2016-04-05 05:27:40 · answer #3 · answered by Anonymous · 0⤊ 0⤋
The rule of thumb is 2/3. You can pull 16 amps on a 20 amp breaker.
2006-11-06 14:27:17 · answer #4 · answered by Anonymous · 0⤊ 0⤋
How to calculate MCB current rating
2013-12-16 17:23:33 · answer #5 · answered by Balu 1 · 0⤊ 0⤋
ohms law
E=I / R
2006-11-03 17:02:23 · answer #6 · answered by cork 7 · 0⤊ 0⤋