Electrical – How long will a treated post last in the ground

Jay, your power utility probably has an instruction sheet with specifications for the post, wire sizes, and temp meter enclosure. In some states you (the home owner) can preassemble the temp service.

Since the temp box only supports plug-ins (extension cords, etc) there aren't any load conductors to inspect. The power utility has to make the connections after they inspect the service. If you don't use a meter/breaker/recpt preassembled box, you have to make it from components.

The connection from the load side of the meter to the line lugs or the disconnect panel my have to be signed off by a Master Electrician. Check your local codes on that part.

Be sure all the parts are the proper NEMA type per specs, and don't bury any cables or conduit (but you can lay them in the trench) until utility or building inspector gives you the OK.

I almost forgot to mention, some electricians have temp services all made up that you can rent. Not a bad idea if it is going to be only short term use. You still have to run your service entry cable however.

A concrete post/form in the ground with some sort of above ground post or embedded post in the concrete is the way to go. Depending on what you want from your fence, ie: privacy, security, looks, etc. will effect what kind of materials to use for the actual visible fence. There are many choices of composite materials and vinyl products out there that are low or no maintenance and will outlast any wooden materials. The first serious structure to fail is usually where a wood post meets the ground. You need to pay special attention to this area, keep wet dirt, leaves etc from building up around the wood posts. The concrete should be sloped away from the post so water drains away and no water stands around your posts. Use good hardware, galvanized at minimum, stainless steel screws are best, but a little pricey.

I'm not sure if either contractor has really given you good advise. Tell us a bit more of what you what your fence to do and look like and we can help you more.