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Activity C-1 | verifying Connection
1. Disconnect all breakers at the service panel. Once all breakers have been disconnected measure the
voltage going to each one of the sets (L1 L1) (L2 L2) (L3 L3) & (L4 L4) all should read 0 voltage.
2. Now, turn on 1 breaker, it does not matter which one. Once one breaker has been turned on,
using your voltmeter place one probe on L1 and the other probe on the other L1, measure across (L1-
L1) you should get a reading of 208-240v. Do the same for (L2-L2), (L3-L3) and (L4L4) (see above
images for example.)
a. If you measure voltage across one of the legs in a set and voltage in another leg of an-
other set, then your wires at the breakers are crossed and must be corrected. Example–
L1-L1 reads no voltage, but L1-L2 gives you voltage reading,
then your wires at the breakers are crossed and must be fixed.
Perform this voltage reading on all legs of terminal block both at the bottom and top of terminal block
turning on 1 breaker at a time. If power going to the unit is not correct, the unit will not operate correctly,
so it is important to perform this test first, before proceeding. The problem might not be at the unit,
but at your electrical panel, or breakers.
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