The biggest threat would come if you have an extension cord plugged in, the longer the cord the more energy it would send to the generator. One of the best ways to protect against the pulse would be to use Metal Oxide Varistors (MOV) across the receptacle on the generator. They only cost about $1 each if your voltage is rated at 120v buy a 220 v Varistor. In fact it may not be a bad ideal to use them to protect all you equipment.