Hello All, I just recently got an old 40 amp variac and stripped it down to the core. My question is do I need to put a .125" gap in the core if I am using a 5 KVA pig. I may at times push the pig further than 5 KVA but I don't think beyond 35 amp input current. I will probably stay at 25 amps. BTW, the primary voltage rating on this pig is 14.4 KV. Thanks for any answers to my question, Dwight