4/0 Aluminum or 2/0 Copper type USE.
I do not think there is an actual code but general rule of thumb is 1 foot between all utilities.
UF cable(underground Feeder) Looks like romex, gray jacket. usually approved for direct burial. Check local electrical codes for burial depths, or if conduit is required. if conduit is required use THHN or THHN-2
There is no such thing as an "electrical citric".
Offcurse you required electrical service in home.
You are required to pass a series of electrical exams. This measures your knowledge on the subject matter and various safety issues to be aware of.
No you shouldn't. It will fail inspection. Use electrical (grey) conduit. It is about the same price and has the proper electrical insulating properties required. The thicker PVC(schedule 40) is best, although schedule 80 is acceptable. (Schedule 40 is required for underground service feeders.)
Conduit is not required for residential electrical IF THE WIRING IS BEHIND THE WALL. If it's exposed wiring, you'll need to use conduit.
One software I know is Auto-cad, which is needed for electrical Drawing.
This steam cleaner does not use any electrical power.
Yes, they are required by the national electric code.
Hydro electrical
There is no limitation of temporary or permanent repairs to electrical insulation. All that is required is that the splice have equal or a better insulation factor than that of the two wires that are being joined together. If it is an underground splice then that has to include the waterproof factor that underground wiring insulation has. Heat shrink over the overall taped splice will suffice for this type of installation.