I was thinking of 210.4(C) but I see Exception #2 cancels it out in this case.
I probably agree, but would need to carefully parse the definitions of Branch Circuit and MWBC to confirm.
Was this done on a single phase or three phase system?
Single phase.
I you are starting with 3 ungrounded conductors and a neutral, you have 3 CCCs, but if you disconnect one of the ungrounded conductors and make it a spare, you now have 4 CCCs per the code. Where you are using only two phase and the neutral from a 3 phase wye system as a multi-wire circuit, the neutral must be counted as a current carrying conductor, so you have the neutral, the two phase conductors and the spare as current carrying conductors. 310.15(E)(2) in the 2020 or 310.15(B)(5)(b) in the 2017.
I guess the language needs changed a little then? I guess if you had same thing but the fourth conductor were a switched leg you now have 4 CCC's. If it is the "home run" to the panel chances are whenever you do use that "spare" it will be the 4th conductor of a "full boat" and you still only have 3 CCC's.
If there that many issue then those people are not qualified and should get trained or not allow to do electrical work.
I agree, and I'm not really following the argument that if these people don't know what they're doing and presumably don't know or don't read the code book, how are more codes going to help
Most people, unfortunately, seem to learn mainly by inspectors giving them corrections.I agree, and I'm not really following the argument that if these people don't know what they're doing and presumably don't know or don't read the code book, how are more codes going to help
Re-inspection fees is the answer. I know some places don't have them and inspector could potentially return multiple times to reinspect a place. Given a significant fee for reinspection should be enough motivation to get things right the first time, or at least the second time. Here first reinspection fee is $50, second is $100. That should be enough motivation in most cases to at least care about making sure you have done right after at least the first inspection I would think.
I can think of only one written violation for me & that was prior to reinspection fee. No argument, it was a complete miss by me.
They are pretty good at verbal requests with most the contractors, usually is over little things that they know probably isn't too big of a deal yet feel they should still be enforcing it. Or at least until you take on a job in an area you haven't worked in before or occasionally when an inspector is still new at inspecting.
I have seen a lot more open service neutrals than I have open branch circuit neutrals, and the open service neutral does a lot more damage.I've done MWBC's but I never liked them. I've seen a few items get burned up by losing the neutral in a circuit. I've seen junction boxes crammed full of 6, 9, or 12 circuits and all markers lost, if they were ever there. A neutral splice sometimes becomes 5 or 6 wires, hard to make a good splice on. Much of this done by people who should know better but working under deadlines or on midnight service calls. What could go wrong?
The service neutral at least will have more potential for some amount of balance, plus will usually have some offset by the grounding electrode system, which very well may make it operate much longer before something has total failure where a branch circuit or feeder doesn't have that second path and results end up being more obvious.
It did, until the power supplies changed.
