I had a service call last week to look at a outlet that had burned up. I am trying to surmise what happened to cause the small fire. Let me tell you what happened and you can tell me what really happened.

The outlet had a 6 outlet cover plugged into it*(without the hold down screw). The fire was actually between the outlet and the adaptor. No question where the fire happened. Big burn hole in the outlet and big burn hole in the adapter. This is obviously the weak spot in the system. The fire didn't happen until a delivery truck pulled down the service drop outside and then the outlet caught fire.

My question is how did the delivery truck cause the fire. Did it cause a low voltage-high current that the weak spot in the line could not handle?

BTW, they had more of the 6 outlet adapters plugged in over the outlet covers with no screws. More fires waiting to happen. They are fixed now.