Here is an example of a homeowner trying to do his own service. Outside was a piece of plumbing pipe with thre 3/0 copper wires running into the service in the basement. Inside he stopped the pipe and ran the wires directly into the service panel. After I fail him the first time, he removed the 3/0 wires and ran 4/0 SEU cable throught the same pipe. After a few trips there I think I finally set him straight. Unfortunately, I still might have to go back one more time to final out his job.
Harold, Is that the finished product?. If it is it will leak like a sieve!. Are you allowed to clamp wires like that in an entry to a panel?. Sure there are bushings, but what is the bare minimum in this respect?. I see a green wire to the left of the 2nd pic, it looks like it is going through the top of the clamp, but seems to be outside of the thread in the lower part of the panel??!. It makes me wonder if this wasn't a Home Depot advised install?. Customer must have asked "what can I use for the bend into the house?" HD guy "Use this, water or wires, it's all the same, the check-out guy told me so".
I really don't get it. These amature service upgrades. How in the world do these people know how to properly do a load calc. and determine conductor sizes, but can't figure out things like putting conductors in conduit?
It's like being able to rebuild a carbeurator but not knowing how to put gas in the tank.
Back when I couldn't spell NEC I did a DIY upgrade from 60A to 200A service on my house. I nicked up the outer coating on the THHN I installed; pretty badly. I made a point of asking the inspector about it and he told me not to worry since that covering was only there for oil protection and oil wasn't likely a problem in my house. (no I haven't opened an oil change shop in my basement since then...)
Also what's the SEU cable on the left? What's the service size. 200amps hence the failure of the 3/0 right?
Its always been my understanding that the nylon jacket is there simply for mechanical protection. I remember reading somewhere (I can't remember where) that when the UL tests wire they remove the nylon jacket from the wire.
That's what a manufacturer's rep told me about the nylon jacket. I asked him what about if the jacket gets damaged when it first comes off the reel? Does the insulation get damaged while being pulled through the rest of the run? He told me "it's UL listed and everyone uses it...NEXT QUESTION?" Anybody who ducks a simple question in that manner makes me suspicious. Since I've have problems in the past with THHN, I prefer to avoid it whenever possible (it's not often possible).