Hawk55
Member
- Location
- Waukegan, IL
- Occupation
- Aviation Consultant - Former Director of Corporate Aviation
I'm not sure if you can answer this question - we bought four 70' 12/3 extension cord reels to be installed in a new corporate jet hangar. We asked the electricians to install them attached to GFI outlets about 48" high around the hangar, however they refused saying that they had to be explosion proof reels because they would be used below 18" above the floor, per NEC Article 13. I have never seen an explosion proof extension cord in any hangar that I've ever been in and I've run a large corporate aviation department for years. The problem is the prices for explosion proof reels for a 50' length start at about $5,000 (and can go way higher from there) vs. $800 for a conventional reel.
"NEC 513.1 Scope. This article shall apply to buildings or structures in any part which aircraft containing Class 1 (flammable) liquids or Class II (combustible) liquids or Class II (combustible) liquids WHOSE TEMPERATURES ARE ABOVE THEIR FLASH POINTS are housed or stored and in which aircraft might undergo service, repairs, or alterations. It shall not apply to locations exclusively for aircraft that have never contained fuel or unfueled aircraft". As I read this, both conditions must be met, 1) the aircraft with fuel in the tanks must be in a building with temperatures above the flashpoint of the fuel (which will never happen) AND 2) the aircraft will be stored in a hangar which might undergo service, repairs, etc. Yes we do some servicing of struts, tires, add oil, etc., but we are not a repair shop and do not have the capability for major aircraft maintenance.
Something doesn’t seem right here. If it’s a paint hangar we understand this because they have volatile compounds in use continuously with vapors in the air. The flash point of jet fuel is is over 100 degrees F. (Both Jet A and Jet A-1 have a flash point higher than 38 °C (100 °F), with an autoignition temperature of 210 °C (410 °F).) We'll never see those kind of temps in the hangar, therefore, we should not fall within the scope as defined in 513.1. At our airport we must all in be in violation because for years we have stored our planes in our corporate hangars with fuel on them and we do not have spark proof equipment. You will find NO explosion proof extension cord electrical reels in any hangar facility at our Airport, and I would venture to guess, ANY civilian airport in the state, unless it is a paint facility or maintenance facility where they have open fuel tanks (even then there are separate requirements for working in enclosed spaces). They have, however, wired the new hangar in accordance with NEC 513. All of the electrical outlets that the electrical reels would plug into have GFI protection.
Any help with this to help define the applicability of the scope would be appreciated before we go spending big bucks on explosion proof equipment.
Thanks - Hawk55
"NEC 513.1 Scope. This article shall apply to buildings or structures in any part which aircraft containing Class 1 (flammable) liquids or Class II (combustible) liquids or Class II (combustible) liquids WHOSE TEMPERATURES ARE ABOVE THEIR FLASH POINTS are housed or stored and in which aircraft might undergo service, repairs, or alterations. It shall not apply to locations exclusively for aircraft that have never contained fuel or unfueled aircraft". As I read this, both conditions must be met, 1) the aircraft with fuel in the tanks must be in a building with temperatures above the flashpoint of the fuel (which will never happen) AND 2) the aircraft will be stored in a hangar which might undergo service, repairs, etc. Yes we do some servicing of struts, tires, add oil, etc., but we are not a repair shop and do not have the capability for major aircraft maintenance.
Something doesn’t seem right here. If it’s a paint hangar we understand this because they have volatile compounds in use continuously with vapors in the air. The flash point of jet fuel is is over 100 degrees F. (Both Jet A and Jet A-1 have a flash point higher than 38 °C (100 °F), with an autoignition temperature of 210 °C (410 °F).) We'll never see those kind of temps in the hangar, therefore, we should not fall within the scope as defined in 513.1. At our airport we must all in be in violation because for years we have stored our planes in our corporate hangars with fuel on them and we do not have spark proof equipment. You will find NO explosion proof extension cord electrical reels in any hangar facility at our Airport, and I would venture to guess, ANY civilian airport in the state, unless it is a paint facility or maintenance facility where they have open fuel tanks (even then there are separate requirements for working in enclosed spaces). They have, however, wired the new hangar in accordance with NEC 513. All of the electrical outlets that the electrical reels would plug into have GFI protection.
Any help with this to help define the applicability of the scope would be appreciated before we go spending big bucks on explosion proof equipment.
Thanks - Hawk55