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# How do you calculate the total amps used in the house?

Wiki User

2015-07-15 18:28:50

for USA, Canada and countries running a 60 Hertz supply service.

This is a complex question that requires you to do some reading, as it confuses even electricians. The applicable reference is: NEC 220.40 Feeder and Service Calculations.

Typically if you are asking this question you should call an electrician to help you. However if you read the applicable NEC article you will be able to calculate your own service.

This can be done by using a clampmeter, this is a instrument that clamps over the main incoming cable ( hot wire ) where it enters the distribution board. You set the meter to read amps and this gives you the total amps being used at that time.

I always ask the customer to find their electrical useage for the last twelve months. Use the highest month in KWHr, divide that by days in month, then hours in day, then supply voltage such as 240-volts. This will show the highest average ampere demand for which your service conductors are supplying. Don't forget to convert to watts at the end.

Surprisingly, most homes average about 10 amps continuous or less. Minimum service rating is 100 amps.

If you are paying \$.1 per KWHr and the bill is \$150 over 30 days, then you used 1500 KWHr, or 8.68 amps per hour continuously on average.

You could simply install socket power readers on all the outlets that have electrical appliances attached to them, and that would give you an indication of your power usage. If you wanted to know amps, then that's something else all together.

In residential installations, this is usually not a necessary factor to calculate. The utilities companies usually only offer 100 amp, 200 amp or 400 amp service. The typical new home in today's market will use the standard 200 amp service.

If you have concerns like having a garage that you will do work in using electrical equipment, then you would want an electrician to calculate the additional load. 200 amp service is quite adequate for most purposes unless you have the aforementioned scenario. My son has a welding shop and business and operates the entire shop with 200amp residential service including a 3 phase generator.

Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized

IF YOU ARE NOT REALLY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.

Wiki User

2015-07-15 18:28:50
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