Always make sure you use properly sized extension cords to avoid voltage drop and the ensuing damage to whatever is plugged in to the cord. I have been trying to drill this one into a guy I have been working for who just bought a $6000 insulation blowing machine which I predict will not last a year without him fucking it up. Same guy bought a $15,000 spray foam machine which sent him to the hospital the first and only time he used it, he hired me to use it four times now it sits in a warehouse collecting dust