Battery room explosion proof type fixtures
- Thread starter shoffnerm
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rick5280
Senior Member
Re: Battery room explosion proof type fixtures
Article 480 of the 2002 NEC is the article you need to follow. The NEC handbook has a comentary following 480.9(A) which says that by following Article 480.9(A) you can keep this area from being classified. That is, by ventilating you change it from a classified area (Hydrogen?) to an unclassified area.
You do need to be worried about corrosion, in your raceways & boxes.
Rick Miell
[ August 13, 2003, 03:55 PM: Message edited by: rick5280 ]
Article 480 of the 2002 NEC is the article you need to follow. The NEC handbook has a comentary following 480.9(A) which says that by following Article 480.9(A) you can keep this area from being classified. That is, by ventilating you change it from a classified area (Hydrogen?) to an unclassified area.
You do need to be worried about corrosion, in your raceways & boxes.
Rick Miell
[ August 13, 2003, 03:55 PM: Message edited by: rick5280 ]
Re: Battery room explosion proof type fixtures
shoffnerm, I assume you have eight strings of batteries installed in a phone office. If you have HVAC which provides normal air changes is sufficient to prevent hydrogen build-up, and that is enough to satisfy NEC 480.9
There are some local jurisdictions that may require a hydrogen monitor and an exhaust fan in the event HVAC fails.
The only I would be concerned is if the room is sealed, no HVAC, and no ventilation. Otherwise it should be OK
shoffnerm, I assume you have eight strings of batteries installed in a phone office. If you have HVAC which provides normal air changes is sufficient to prevent hydrogen build-up, and that is enough to satisfy NEC 480.9
There are some local jurisdictions that may require a hydrogen monitor and an exhaust fan in the event HVAC fails.
The only I would be concerned is if the room is sealed, no HVAC, and no ventilation. Otherwise it should be OK
brian john
Senior Member
- Location
- Leesburg, VA
Re: Battery room explosion proof type fixtures
Derk:
Could be a single UPS? Some UPS systems utilize 192 cells.
We have numerous flooded lead acid batteries under maintenance contracts and ventilation is the used in all the installations.
Not saying corrosion may not be an issue but in 25 years of doing battery work, I have not seen this problem (boxes and fitting corroding
Derk:
Could be a single UPS? Some UPS systems utilize 192 cells.
We have numerous flooded lead acid batteries under maintenance contracts and ventilation is the used in all the installations.
Not saying corrosion may not be an issue but in 25 years of doing battery work, I have not seen this problem (boxes and fitting corroding
Re: Battery room explosion proof type fixtures
Brian it could be a UPS, 192 just works out for 8 48-volt strings. Doesn't matter, either way. I have designed many UPS and DC plants, some AHJ require extra ventilation some do not. As long as there is ventilation, there is no real danger. The biggest issue I run accross is spill containment for flooded batteries.
As you say corrosion is not an issue. I do not use enclosed raceways for DC cable rather cable ladder. The only place corrosion is an issue is at the battery term plates, inter-cell connectors, and cables that connect to the term plates. I use lead coated compression connectors with no inspection holes and all cables and terminal connections treated with "NO-OX". Or in other words follow the manufactures direction to the letter, and use compression connectors with a crimping tool that uses either circumcial or hexagon compression dies, no "pinch compression. Burndy makes a full line of connectors and tools for DC power work.
Good Luck
Dereck
[ August 13, 2003, 08:23 PM: Message edited by: dereckbc ]
Brian it could be a UPS, 192 just works out for 8 48-volt strings. Doesn't matter, either way. I have designed many UPS and DC plants, some AHJ require extra ventilation some do not. As long as there is ventilation, there is no real danger. The biggest issue I run accross is spill containment for flooded batteries.
As you say corrosion is not an issue. I do not use enclosed raceways for DC cable rather cable ladder. The only place corrosion is an issue is at the battery term plates, inter-cell connectors, and cables that connect to the term plates. I use lead coated compression connectors with no inspection holes and all cables and terminal connections treated with "NO-OX". Or in other words follow the manufactures direction to the letter, and use compression connectors with a crimping tool that uses either circumcial or hexagon compression dies, no "pinch compression. Burndy makes a full line of connectors and tools for DC power work.
Good Luck
Dereck
[ August 13, 2003, 08:23 PM: Message edited by: dereckbc ]
brian john
Senior Member
- Location
- Leesburg, VA
Re: Battery room explosion proof type fixtures
in other words follow the manufactures direction to the letter.
The number of projects we get called into to correct issues where this is not followed bogles the mind.
in other words follow the manufactures direction to the letter.
The number of projects we get called into to correct issues where this is not followed bogles the mind.
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