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#180991 - 09/18/08 12:01 PM Cords above ceilings  
renosteinke  Offline
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
This picture - please forgive the poor quality - shows new construction. The customer has added a receptacle above the dropped ceiling 'just in case' he later wants to add something above the ceiling.

In other words, he's deliberately planning to violate 400.8 (5), which bans flexible cords above dropped ceilings.

[Linked Image]

With the things we place above ceilings ... HVAC equipment, heat trace tape, alarm panels ... as well as the stuff that gets hung from the ceilings ... lights, projectors, etc .... is it time to reconsider this ban?


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#181026 - 09/19/08 11:23 AM Re: Cords above ceilings [Re: renosteinke]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,123
Estero,Fl,usa
Write a proposal and see what they say. I would think they will want it fairly limited in scope.
It is interesting that receptacles are not specifically banned so they must know ...


Greg Fretwell

#181027 - 09/19/08 01:11 PM Re: Cords above ceilings [Re: gfretwell]  
ghost307  Offline
Member
Joined: May 2005
Posts: 916
Chicago Illinois USA
The prohibition against it was just added a few Code cycles ago.
I don't think that it's ready to be repealed just yet.

I was told that the reason that receptacles are permitted is to accomodate the temporary use of cords while servicing or maintaining equipment. Not so that something could be plugged in and left there.


Ghost307

#181033 - 09/19/08 08:47 PM Re: Cords above ceilings [Re: ghost307]  
WESTUPLACE  Offline
Member
Joined: Mar 2004
Posts: 251
Kingwood, TX USA
In the supermarkets, they do put receptacles above the lift out ceiling to plug in transformers (oversize wall warts) for alarm and other LV ckts. They (transformers) have no cords so inspector said its legal. What stops someone from using it for a cord later is in question. Robert


#181037 - 09/19/08 10:26 PM Re: Cords above ceilings [Re: WESTUPLACE]  
twh  Offline
Member
Joined: Mar 2004
Posts: 919
Regina, Sask.
Don't you use service poles (pac poles) with cords in offices? I thought they were common in the cubicle world.


#181042 - 09/20/08 11:16 AM Re: Cords above ceilings [Re: twh]  
ghost307  Offline
Member
Joined: May 2005
Posts: 916
Chicago Illinois USA
All the power poles that I am familiar with use conduit (sometimes flex) to feed them above the ceiling.


Ghost307

#181048 - 09/20/08 03:06 PM Re: Cords above ceilings [Re: ghost307]  
mbhydro  Offline
Member
Joined: Feb 2003
Posts: 347
Winnipeg MB Canada
In Canada we are allowed to use power poles that are cord ended. Wiremold for example has this as an option for Canada only in their cut-sheet.

I saw a lot more of them in the 80's when computer terminals were first going on desks.

They were used to bring both power and coax to everybody's IBM 3270 crt.

Now that most people are in a cube farm everything is hardwired as part of the furniture package.


#181089 - 09/22/08 02:35 PM Re: Cords above ceilings [Re: mbhydro]  
mamills  Offline
Member
Joined: Nov 2001
Posts: 745
Wharton, Texas, USA
I admit to not knowing the first thing about security systems, but I would guess there are a fair-sized number of receptacles above ceilings in department stores and other commercial buildings for the purpose of powering security cameras, pan/tilt mountings, etc.

Mike (mamills)


#181098 - 09/22/08 06:49 PM Re: Cords above ceilings [Re: mamills]  
jdevlin  Offline
Member
Joined: Aug 2002
Posts: 402
welland ontario canada
The security sytem we have has no power requirements at the devices. It all located in one room with power to the cameras being supplied by the same cables that bring the video. The power is not located at the camera.
Same with the security system. All master controllers located in one location with magnet power etc all at that location.


#181177 - 09/24/08 02:00 PM Re: Cords above ceilings [Re: jdevlin]  
ghost307  Offline
Member
Joined: May 2005
Posts: 916
Chicago Illinois USA
I haven't seen power requirements for an individual camera or security device in years. The power for all of the equipment is DC either routed on the coax or along separate wires in the camera cables. That DC is derived from the head-end equipment back at the Security Desk. Any 120V power that needs to be obtained locally (like pan/tilt/zoom) are wired in an armored flex.

I think the security world took a hard look at the cop shows in the 70's where the bad guys would just unplug the camera while they robbed the place.


Ghost307


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