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01-09-2012, 01:44 PM #11
Re: Cooling Tower Fan Motor - Water Ingress
I've never heard of static charge being induced on a blade set in clean air. I've seen environments such as flour silos where the contaminants in the air can cause static charge but usually in these special locations the motor would be Ex rated and bonding would be applied to any and all components.
I have very little knowledge of cooling towers but I would imagine if the air is very humid or saturated with spray then potential differences or static charges would be even less likely as moisture would allow any differing potentials to equalise by leakage.