jkflipflop67
Member
- Location
- Columbus, Ohio
NFPA 409 5.7.2 requires that the power source for hangar doors on Type I and II aircraft hangars operate on independent circuits and shall not be de-energized when the main disconnect switches for general hangar power are shut off. There are eight seperate hangars and two end office spaces for a total of 10 bays. They have been seperated into two-5 meter/main service entrance arrangements to get past the 6 switch rule with ultimately a single, service disconnect required by the utility company at their transformer. Has anyone had to deal with something like this before and to what degree is the intent of NFPA 409? Do the hangar doors have to be main-lined with the utility company ahead of any disconnect or can they be tied into the distribution between the utility company's main disconnect and the individual service disconnects?