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Yeah but (and I'm not disagreeing with your desire for conservatism here...), remember they connect the power cables to the breaker panel with clamping set-screws - same on the main power feed on the wire/pole. I wouldn't use wire nuts for 10kW, but I'd feel perfectly fine using power splice...

Looks really clean, nice job :) Probably the certification process that costs so much - after that they like to bend you over and "service the account..."

A wire can be spliced with wire nuts, insulated splice cripms, or insulated splice clamps - as long as the connection is done inside a box and the wires are the same conductor size (i.e. you are especially not allowed to reduce the size of the downstream wire), strain relief clamps are also...

I totally agree with steelypip on this, but I'd recommend SOOW cable if it's going to be outside. You can use spider boxes as power distribution if you're worried about the individual circuit loads. Temporary power systems get a lot of leeway, and are less heavily regulated. If you're not...

There's just the liability issue to deal with - if someone give you advice here and you do something (either intentionally or not) that hurts someone - their attorney could find this thread and try to tie anyone who posted here to a lawsuit. You still need permits, I see from your signature...

I believe you need permits and an Electrician to do this. If not the electrician (assuming you are one), you still need permits. At 10kW 120V you are basically talking about standard 100Amp service. there is plety of energy there to start fires or kill if not done correctly. There are NEC...