Either repair the existing cable by properly splicing it or just start over with a new cable. There is nothing wrong with splicing an EGC.so i'm going to get this fixed ASAP... i've been advised to get a splice box to splice the #4 GND on the SER but that solution bothers me a bit. there is no GND left at the meter end. we could splice it in the middle of the SER (at least the 35' 2/0; the 1/0 would be more difficult as most of it is in conduit) but i'd rather have a non-spliced ground wire.
Cost to splice it may still get you in same price range of a 36' piece, plus you need an accessible space to place the junction box.i agree but the 2/0-2/0-2/0-4 is 36' long. the 1/0 SER is 15' long so that maybe replaceable.
If the 2-2-2-4 was feeding entire dwelling unit it was acceptable per 310.15 (B)(7) to put it on a 100 amp breaker. They possibly were used to doing that frequently and knew it was acceptable but maybe not aware of why.i hired a licensed electrical company to do this job in April. they did no load calculations; they derated no wires (he acted like he didn't even know what it was). i asked the electrician for 125A in each unit, minimum. what i got was 2-2-2-4 feeders that carry 90A, and even while they were installing, they assured me the feeders had 125A ampacity. then they put in 100A tenant breakers & 100A mains in the subpanels. they must've thought i was a total fool.
so i fired them and bought new feeders and new subpanels to fix their crummy work. i had to have a minimum of a 125A panel w/ 60A double pole for tankless water heater in one of the units (the smallest one). i figured out how to do my own load calcs and 125A was the MINIMUM required in each unit to support the load.
i got a friend to help me fix this because i knew i could not handle the 1/0 and 2/0 SER's. unfortunately, he cut the EGC's. now i'm fixing his mistake. however, his error is more acceptable because, while it's wrong, it was at least an honest mistake.
after i realized the electrician screwed me, i called the AHJ but here, in my neck of the woods, the AHJ is a joke. i went to them about the load calcs, the non-de-rated cable and the fact i got two 100A panels when i was told i'd get two 125A. the AHJ doesn't really check their work, but goes by what the contractor signs off on what he SAYS he did. the AHJ guy said he can't force contractors to do load calcs or to install derated cables... he said the contractors would call the mayor who would then call his boss & his job would be in jeopardy. that's when i realized the AHJ & contractors are in bed together and neither one give a rat's a$$ about the end customers. it's a giant good ole boy system here.
so i'm on my own...
if anyone wants to impart electrical knowledge to help i'd appreciate that. if not that's OK too; i'm figuring it out on my own.
Your contractor needs to replace that SER, are you sure he had a license???If the 2-2-2-4 was feeding entire dwelling unit it was acceptable per 310.15 (B)(7) to put it on a 100 amp breaker. They possibly were used to doing that frequently and knew it was acceptable but maybe not aware of why.
But still a problem if you needed a 125 amp feeder. With (B)(7) and 125 amp - you are about 4 amps too much for #1 so 1/0 Aluminum is what would be required.