Crunch, I am not a well expert by any means but many people here who have wells have a 110 outlet on them for a light or heating element. To be fully safe you should be wiring to an insulated wire for the neutral side of your 110 outlet, which you may or may not have. The concern I would have is with the neutral side and ground. If you have a metal pipe in the ground that may be sufficient, but some pumps are using PVC which wil not take care of your ground/neutral side at all. The checking of the load is part of it and as has been pointed out a motor has a heavy start load compared to the running load. But if you has using numbers already used a 30 amp circuit to your pump and it is only drawing 20 amps, so you wire into that circuit your 110 circuit is protected by that 30 amp breaker if you don't add another breaker at the outlet or fuse. So if you use 12 guage wire for the 110 outlet and there was to be a short in it, it could heat enough to cause a fire and never trip the 30 amp breaker. Of course if you decide to buy another wire or pvc pipe, you must be clear of the already buried wire to the pump. See if you can get that wire and any other wires marked.

Someone has used the term PHASE in this conversation and someone else has used the term LINE. They are not the same. If your pump is 3 phase and I guess it could be, be sure someone who knows 3 phase is working on that circuit. kt

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