As a computer hardware enthusiast and a fresh DIY-er (just moved into my own house), I've purchased a digital clamp multimeter. Learned the hard way that in order to utilize the clamp to measure current, the supply line needs to be split.

Rather build a line splitter instead of settling for a product. The clamp has a 20A limit - research indicates a 12/2 wire with an equally rated male-female power plug should suffice.

Has anyone created a line splitter before - Any precautions/best practices? Thanks

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    While we're indeed a DIY site, our theme is home improvement. I'm afraid this topic falls outside that scope. You might try electronics.stackexchange.com. – isherwood Jan 16 '18 at 15:24
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    I think a question about using a clamp meter to measure current draw of a standard home electric system is on topic. He's asking about two tools that any residential electrician would use all the time. – JPhi1618 Jan 16 '18 at 16:47
  • Putting the issue of it being for computers and not a home aside, building complex tools is not the same as using them. :) – isherwood Jan 16 '18 at 16:49
  • just split an extension cord in the middle; no wire cutting or dangerous operations involved. – dandavis Jan 16 '18 at 21:02
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    Right, just get a 1' extension cord of the "flat" type, and carefully exacto down the grooves, erring toward the ground wire in the middle. – Harper - Reinstate Monica Jan 16 '18 at 22:07

I have created a line splitter like this with a heavy duty male and female three prong plug and three 14g wires - white, black, and green. 12/2 romex will have a bare copper ground, and I didn't want any exposed wire so I used actual green insulated wire for ground.

Use plugs that have an integrated wire clamp so the connections are secure, and don't leave it plugged in for longer than you need to make your measurements because the exposed separate conductors are not as strong and make a trip or tangle hazard. This is a special tool, not a permanent extension cord.

I know you said you didn't want a product, but if someone does, there are devices like this that are made to do just what you want in a safe, listed way. It has one loop for regular measurements and a second loop that multiplies the signal 10x (it just as 10 loops of the wire there).

enter image description here

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    I have a male female cord also only about 1 foot long so I can trouble shoot lighting fixtures I use. My handy tool at least every other week. – Ed Beal Jan 16 '18 at 17:11
  • @JPhi1618 - thanks, good advice. Will stop by Home Depot this weekend to prepare for the same. – eszed Jan 23 '18 at 21:14

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