how do you wire a double pole contactor is it phase feed to a1 neutale feed to a2 and load phase to 1 and n?

Answer 1

I am assuming that your control system is A.C.
Coil is fed bycontrol signal L to a1. N to a2.
Power feed goes through switched poles,connections to which are normally located on opposite sides of contactor block. ie
L N (power source)
I * I
I * I
L1 N1 (Heater load)

Answer 2

a1 and a2 are the contactor coil, so wire your (control signal + control neutral) to them (to energise the coil and "make" the contactor).
there should be 4 connections left on your double pole contactor, 2 at the top and 2 at the bottom. so wire your supply phase + neutral into the top and your Load phase + neutral into the bottom

Answer 3

well take n and put phase one on H, then multiply double pole by T, devide by x2

Answer 4

If you don't know you shouldn't be monkeying with electricity.
You'll kill yourself