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Sagot :
The homeowner has reported that sometimes the electric furnace trips the 240-V, 60-A circuit breaker connected to it. Upon examination, it is found that the furnace contains three 5000-W heating elements designed to turn on in stages.
Solution
The power rating of the circuit breaker = volt x current
= 240 x 60
= 14400 W
So, we have 3 units of 5000W each.
Explanation and Recommendation
When the first unit is turned on, the consumption is 5000W and the circuit breaker does not trip. When two of the 5000W units are turned on, it adds up to a consumption of 10000W.
The circuit breaker is still intact. But when the 3rd 5000W unit is turned on, the consumption reached to 15,000W which is greater than the 14,400W mark, and thus the circuit breaker trips off.
So, switching on all three units at once can cause the circuit breaker to trip off.
So, the recommendation would be that at a particular time maximum of two units can be turned on.
Even such, the two units cannot be turned on in series or they won’t receive 240 V each.
Another recommendation would be to use a circuit breaker of a higher power rating, more than 15,000W so that there will be no tripping.
To know more about circuit breakers, visit:
https://brainly.com/question/17040163
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