Hello and welcome to Just Answer. My name is ***** ***** I will be happy to assist you with your electrical question.
1) Have PECO perform the following and confirm:
A) They should install a Power Quality Monitor at their transformer and also on the LOAD side of the house meter. The Power Quality monitor will check for voltage spikes, sags, over voltage, etc.
B) The tap lug connections on the PECO transformer and at the meter LINE and LOAD side lug connections need to be confirmed for proper torquing/tightening to make sure there are no loose connections.
C) PECO needs to perform phase to phase (240VAC) voltage measurements and each phase to ground (120VAC) voltage measurements at the transformer and inside the meter enclosure. The 120 and 240 volt nominal voltage levels need to be measured and confirmed if within the tolerance percentage of their transformer specs and also account for any voltage drops up to the LOAD side of the meter.
D) Confirm with PECO if you are the only customer on their transformer. If other customers on the transformer, find out if any other customers are experiencing similar problems such as you are having.
E) Have PECO confirm that there is no loose neutral connections at the transformer or at the house meter.
2) It is also recommended to have your local licensed electrician present during the PECO service call and have the electrician explain what was previously checked on your customer premise electrical distribution equipment. I recommend this in case PECO tries to point any fingers by stating the problem is not on their end, but on your end.
Reply back to me and let me know what develops on the situation............Thanks...........Kevin:)