What is the max amperage rating you can legally install? Currently all the circuit breakers on my plugs is 20A. Can I go to 30A? For some reason when I use my microwave and electric fryer together it trips the power. Strangely the 2 together does not use 20A, if I can believe their wattage rating in their manuals. I forgot, my fridge is also plugged in on the same plug. Are using the 3 together on the same wall plugs considered too much?