Gentlemen: This question concerns both application and safety(perhaps more) on direct Immersion Electric Heaters in a sump of a Cooling Tower. The Heaters are in direct contact with the water of the sump (cold water basin) to prevent freezing (typically 40 to 45 degrees). The sump areas are typically large enough to access through a door onto a cat walk. This places a worker directly above a sump area with a potentially charged (heater energized and failing) water source. Finally, my questions!! Is there a Megohm reading that the heater should pass to be considered safe, and does or should any type of code call for a specific type of breaker or fuse(circuit protection)for this application ?? More information available if required, thanks.
