My brother has a place with an outbuilding that probably formerly was a guest or workers house, now he uses as a place to do artwork or read and write (as a hobby). I’ll call it a studio. The main house and studio were built sometime in the ‘40s. Due to tree roots, he has had to dig up the entire iron sewer line which goes from the studio to the main house. In the process, he found the conduit completely rusted out, and needs to be replaced. The subpanel in the studio also needs to be replaced because it has been problematic for a while, and is a mess. I plan to help him with the electrical, and have a few questions I could not clarify reading previous posts here. The ~100 foot conduit contains three 8 gauge wires feeding the subpanel (no ground), and two more 12 gauge wires feeding outdoor flood lights, which are controlled by a switch at the main house. In the studio, there is a tiny kitchenette with a sink and a small electric 4 burner stove with oven, and a mini fridge. There is also a bath room with a small (25 gal?) electric water heater. There is no heating in the studio except for the occasional use of a portable 1000W heater. The breaker on the main house feeding the subpanel is 60 amps. Does the breaker and wire size seem adequate? We could upsize if recommended. Also, we would add a fourth wire for a ground in the new PVC conduit. The extra two wires in the prior conduit for the outside lighting seem contrary to code. Should those be placed in a separate conduit if still switched at the main house? Thanks in advance for any information you can provide.

Bought some Wago lever nuts to use in a couple of cramped boxes to save space over wirenuts. What I find a little concerning is after closing the levers the wires don't seem to be all that tight in that you can turn the wire in the connector fairly easily. Can't help the feeling that the connection could be a candidate to build up resistence similar to the problems some backstab connectors exhibit. Anyone have any long term experience in their use? Yes, I am using the correct wire size/connector with solid wire.