I have been running my Airflex with two HD Electros on one cord now for ages now with absolutly no problems........................... until this week. Monday the fuse in the plug burned out then today the replacement fuse went again. So I am thinking to convert it to run on two cords. It is very rare I have any problems with household fuses and trips though maybe one every three or four months..
The performance of the two HD Electros in parralell is very good.
Hmm , I replace my plug every couple of months . The 13amp slow burn plug fuse will be running warm but ok . If the heat eventually damages the contact surface of the plug fuse holder . The heat will increase with resistance and fuse will blow .
Its it possible the contacts were blackened when u put in the new plug fuse . Its best to replace the whole plug .
Another answer would be to find or make a 15amp fuse for the plug .
Stick with it but just keep an eye on the plug or replace regularly .