This was the average current draw taken with a slow responding dvm so i would expect much higher peak current draw but did not measure it.
Elder amp draw.
Many amps have the max power draw on the back near the power cord.
Find out what the current draw of the 200 amp unit you will be buying is and let the electricians know.
The kenwood head unit with built in 4 channel amp that i used for my son s boombox consumed 0 5a at very low volume and 1 to 2a at reasonably high volume.
Obviously the max power draw only happens with the amp dimed so a meter would be the best way to find the power drawn under given conditions.
The corded tool power draw in amps is important when it s time to figure out what size extension cord is acceptable.
Ot general amp draw of a car stereo.
If your amp draw is high unloaded there is an issue with the system as it is currently running.
In some cases like circular and table saws amperage draw can approach 15 which may make a standard 15 amp circuit marginal.
The issue is not going to be the belt and deck at least not entirely more on that later.
You could also get a current or power meter between the amp and the socket.
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An amp running at at a low stage volume may only be putting.
They will base the wire size and circut breaker on whatever current draw you give them.
If you will be adding equipment that will draw more than the 200 amp machine in the future use that current draw for the electricians info.