Anything that would lead to a "pool fire" in the same area or in an area adjacent to Electrical Seal Heater. We consider a liquid that is below it's flashpoint and more combustible/flammable than an NFPA Class IIIB to have risk of a pool fire. So, a pipeline that runs through the areas, a tank in the areas, a pump in the areas, etc.
In some old buildings, the building itself may be a source of fire (made of wood).
Typcially, during the design, the original engineer will state fire case, and give source(s) of fire.
"Do not worry about your problems with mathematics, I assure you mine are far greater."
Albert Einstein
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