Is 62 - Year Old Building Wire Still Good?

Ravenvalor

Senior Member
Thanks for all of the great help. I talked the customer into removing the wire and upgrading the outside service to 200-amps so that I can install a 4/0 SER AL cable across the carport ceiling and down into the basement where the new sub-panel is going.
 

Frank DuVal

Senior Member
Location
Fredericksburg, VA 21 Hours from Winged Horses wi
Occupation
Electrical Contractor, Electrical Engineer
Brief 100v Megger readings H-G can see end-of-service life for equipment that continuity testers can not.
That's funny! :LOL: When in use it is 120 volts.... I do not call that a megger test for house wiring. Maybe a megger test for automotive work. Interesting to note, Megger has discontinued those really low voltage meggers, and now they go to 1 KV. You can still do 50 volts for electronic circuits.

600 Volt wire is good for more than 600 Volts for brief times, as a service factor is already in there. It does not fail at 700 volts.
 

ramsy

Owner/Operator
Location
LA basin, CA
Occupation
Service Electrician 2017 NEC
Megger has discontinued those really low voltage meggers
Nope! Megger's modern MIT 430/2 series still has 50v / 100v / 250v / 500v / 1kv.

600 Volt wire is good for more than 600 Volts for brief times, as a service factor is already in there. It does not fail at 700 volts.
Yes, manufacturers may even have a Hi-Pot test for new THWN in the 1kv range, but do you really expect 60yr-old rubber & cloth to survive 1500 volts, as suggested earlier?
 
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