- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
Next time we'll invite you-- maybe you can learn something new.
700.9(b)
- Thread starter dcspector
- Start date
- Status
dcspector
Senior Member
- Location
- Burke, Virginia
Next time we'll invite you-- maybe you can learn something new.
Now that is funny.....
- Location
- Massachusetts
Next time we'll invite you-- maybe you can learn something new.
:grin: :grin:
dcspector
Senior Member
- Location
- Burke, Virginia
Thanks Roger. Looking forward to your findings. BTW I did pass the inspection last week due to the comments on this thread.
nvpowerdoc
Member
- Location
- Las Vegas, NV
Two Places where Emergency and Normal power can coincide
Two Places where Emergency and Normal power can coincide
Our AHJ (Clark County - Las Vegas) is pretty concise in their determination of where Emergency and Normal Power can coincide in the same device or box: In an ATS (naturally), and in fluorescent fixtures so designed to contain normal power and emergency power. Everywhere else they actually require a 2Hr fire rated separation between normal and emergency power .
So imagine if you will, an ATS on the 35th floor of a high rise building requires a special chase to be built (2hr fire rated walls) within the core electrical rooms (that provide normal power) on each floor of the high rise as you go up.
From an Engineering an Design perspective, I would not place emergency and normal power conductors in the same box, vault, or manhole regardless of barrier system. This simple mistake caused the Bellagio to go without power for four days because normal and emergency feeders went through the same manhole. The conductors were all fire-taped, and still there was a failure between the two systems. The insurance claim was for $4M.
Two Places where Emergency and Normal power can coincide
Our AHJ (Clark County - Las Vegas) is pretty concise in their determination of where Emergency and Normal Power can coincide in the same device or box: In an ATS (naturally), and in fluorescent fixtures so designed to contain normal power and emergency power. Everywhere else they actually require a 2Hr fire rated separation between normal and emergency power .
So imagine if you will, an ATS on the 35th floor of a high rise building requires a special chase to be built (2hr fire rated walls) within the core electrical rooms (that provide normal power) on each floor of the high rise as you go up.
From an Engineering an Design perspective, I would not place emergency and normal power conductors in the same box, vault, or manhole regardless of barrier system. This simple mistake caused the Bellagio to go without power for four days because normal and emergency feeders went through the same manhole. The conductors were all fire-taped, and still there was a failure between the two systems. The insurance claim was for $4M.
Pierre C Belarge
Senior Member
- Location
- Westchester County, New York
Powerdoc
Do you know what the cause of the failure was in the manhole? Were the conductors kept apart the proper distance?
Do you know what the cause of the failure was in the manhole? Were the conductors kept apart the proper distance?
- Status