fiquare amp load

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Location
Three Lakes Wisconsin
Occupation
master electrician
Can you guys tell me if I need to add my two parallel line's amp feeding my 480 volt three phase 42 circuit panel to get the correct amp load on each phase? or can I get the correct load reading if I put my amp meter on just one of the incoming feeder lines.
Thank you for your help.
 

Jraef

Moderator, OTD
Staff member
Location
San Francisco Bay Area, CA, USA
Occupation
Electrical Engineer
How accurate do you need to be? If you have parallel conductors feeding one phase, and you want to read the current on that phase, you should get a clamp that goes around all of the conductors. If you read one conductor, there will be differences in resistance of the conductors and therefore slightly different amounts of current. But if +-2% is OK, then yes, you can read one and multiply.
 
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