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Allowable resistance to ground

Allowable resistance to ground

Allowable resistance to ground

(OP)
We have two submergable heaters in a concrete cooling tower sump.  They are about 7 months old.  Our MCC showed a ground fault and investigation show the heater to have 0.33 ohms to ground which is not very much.  Is this acceptable?  I didn't think any thing but zero would be but can't find a reference.

RE: Allowable resistance to ground

Heater element to ground should be in few megaohms. 0.33ohms is effectively a short to the ground and hence the ground fault. Replace the heater..

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