Iron and Machine
Some may not know this but it's crucial info. Do not have your iron on the same electrical plug as your sewing machines. The iron is constantly going off and on. That may mess with the machine. The irons that don't have auto shut off still go on constantly to bring the iron up to selected temp. If you are sewing and the iron perks up to use power then your machine may have a drop in power, if the iron drops power then the machine could have a serge of power. Over time this could cause lots of damage to the machine.