How to Connect a Portable Generator to a House: 14 Steps MethodTips Determine the essential appliances in the home you cannot do without. A petrol-driven generator with a rated power of about 3500W will serve for lighting, TV, fans and a fridge or freezer. The rated power is usually written on the body of the generator and it is that power the generator can deliver continuously for an average of 12 hours on a single tank of fuel.List the appliances and electrical devices you plan to use, then look at their wattage or power requirSee all 6 steps on wwwhow89%(64) Connecting Portable Generator To Home Wiring: 4-Prong and WIRING A GENERATOR 4-PRONG CABLE TO 4-PRONG OUTLET. Newer homes may have 4-prong 125/250V drier outlet NEMA 14-30R. It provides a separate ground hole besides L1, L2 and N (see diagram). For our task it has the right number of leads, but a wrong geometry.Hazards Associated With Plugging A Genset Directly to House Wiring1. Feeding electricity back into the grid (“backfeeding“) presents a hazard for linemen and neighbors. Using main breaker instead of a transfer swi..Connecting A 4-Prong Cable to 3-Prong OutletThe homes built prior to 1996 may have a 3-hole 125/250V outlet NEMA 10-30R. It provides two “hot” wires and neutral (see diagram). The old applian..Wiring A Generator 4-Prong Cable to 4-Prong OutletNewer homes may have 4-prong 125/250V drier outlet NEMA 14-30R. It provides a separate ground hole besides L1, L2 and N (see diagram). For our task..