You are adding an extension to your home (one guest bedroom and an attached bath

Question

You are adding an extension to your home (one guest bedroom and an attached bath). The bedroom needs a 100 W lamp fixture, a 150 W ceiling fan, 2 wall outlets (one will be used for a small 200 W TV and the other for some small wattage appliance like a phone charger). The bathroom will have a 100 W lamp fixture and an outlet (maybe for a 1200 W hair dryer). You want to run one new circuit for the bedroom & the bathroom.

What is the maximum possible current in the circuit?

What should be breaker rating (15 A, 20 A or 30A) for the new circuit?

Explanation / Answer

Total Power = 450+1300 =1750 W

Mximum current 1750/120= 14.58 A

Breaker rating could be 15 A , to be on a safer side , we can take twice the required = 30A breaker

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