Airplane Hangar Power for Doors

[Npstewart]

Im working on an Airplane Hangar. NFPA 409 is dedicated specifically for Air Plane Hangars. One of the code sections in NFPA 409 (Section 5.7.2) says "The power source for hangar doors shall operate on independent circuits and shall not be de-energized when the main disconnect switches for general hangar power are shut off".

Does this mean that I need to have two main disconnects? Ie. One for the "General" hangar power, and then one for the doors?




The word "General" in the code section above sticks out to me.

 

[xptpcrewx]

Im working on an Airplane Hangar. NFPA 409 is dedicated specifically for Air Plane Hangars. One of the code sections in NFPA 409 (Section 5.7.2) says "The power source for hangar doors shall operate on independent circuits and shall not be de-energized when the main disconnect switches for general hangar power are shut off".

Does this mean that I need to have two main disconnects? Ie. One for the "General" hangar power, and then one for the doors?


View attachment 2556844

The word "General" in the code section above sticks out to me.

I’m reading this the same way as you. Two disconnects required.

 

[Hv&Lv]

Line side tap?

 

[hillbilly1]

Interesting, that explains the separate panel and service disconnect at the hanger we have now, but the previous hanger we had, everything came out of the same panel. Wonder what the logic behind that was? The drive wheels can be disengaged to manually open the doors. Maybe it’s for the upward folding type door, instead of the sliders?