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Chris
 
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Default electrical cable next to heating ducts

I am trying to run a new electrical line but have a tight space where there
is a heating duct. That brings the cable close and potentially touching the
house heating duct. I saw a reference to cables in such a situation
requiring insulation or 1" air space.

What kind of insulaiton would you use. Household fibreglass? or is there
some special requirements.

Thanks
Chris