Why voltage drop to 75 volt when plug into 115 volt outlet?

Answer 1

If you had to ask this question here you should not try to do this job yourself, you should call a licensed electrician to correct the fault and advise what other work may be needed to bring the circuit - and maybe other circuits in your home - up to full electrical safety standards.

Serious home fires can result if this kind of fault condition is not corrected urgently.

To comply with the terms of your home insurance policy you must be sure that the circuit supplying power to any outlet uses the correct type and size of cable, the correct type of circuit breaker as well as the correct type of wall receptacle, and that all connections are tight.

Another answer

Typically this is caused by a loose connection somewhere in the circuit. Turn off the power to the circuit and remove the outlet and inspect. No problems found move to the next one and do the same. You may have to go all the way back to the panel to find the problem. Breakers sometimes burn the buss where they clip on and cause this problem. Also check the connections at the neutral bar.

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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized.

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS