Why am I only getting 130 volts at some power sockets?
Does anyone have an idea why on the same circuit 4 boxes have 240V and 3 boxes have only 120V?


It may be there is a loose/corroded/burned connection in the 4th or 5th circuit box.

It may be you are using a voltage detector that has LED indicators for specific voltages, and does not make an exact measurement.



I would turn off the circuit breaker for that circuit, lock it out (to prevent other people turning it on), verify that nothing is live, verify again, then check resistance from live on 4th socket to live on 5th socket using a good quality Cat-II or better meter.