busman
Senior Member
- Location
- Northern Virginia
- Occupation
- Master Electrician / Electrical Engineer
Got asked by an HVAC contractor to change a 120V circuit for a home air handler to 240V, the voltage of the new handler. Obviously not hard to change in the panel, but how would you be able to be sure that this is an Individual Branch Circuit. Obviously, BAD things will happen if there are other loads on this circuit. I so far have done the following:
1) Visually traced the Romex from the basement panel, outside the house where it follows the refrigerant lines and into a sealed attic space (cape code house) above the finished attic where the AH is located.
2) Put an ammeter on the line with the AH shut off to verify no load.
3) Shut off circuit and checked everything in the house that I could find to make sure they were still energized.
4) Put a wire tracer on the circuit to try to find any branches above the attic ceiling; didn't detect any.
Is there anything I'm missing?
As always, thanks in advance; you are a great source of information.
Mark
1) Visually traced the Romex from the basement panel, outside the house where it follows the refrigerant lines and into a sealed attic space (cape code house) above the finished attic where the AH is located.
2) Put an ammeter on the line with the AH shut off to verify no load.
3) Shut off circuit and checked everything in the house that I could find to make sure they were still energized.
4) Put a wire tracer on the circuit to try to find any branches above the attic ceiling; didn't detect any.
Is there anything I'm missing?
As always, thanks in advance; you are a great source of information.
Mark