NYC- Raised Floor Cabling
- Thread starter cdiangelo
- Start date
- Status
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Re: NYC- Raised Floor Cabling
NYC is under the 2002 NEC with a list of amendments under Local Law #81. The only amendment that I see is this:
645.5(D)(5)(c)-deleted reference to cable types NPLF and FPL.
So it would seem that all of the provisions of Article 645 in the 2002 NEC would apply to installations in NYC. Rigid conduit is permitted but not required. Here is the link to Local Law #81.
http://www.nyc.gov/html/dob/downloads/pdf/sec4a_ll_81_2003.pdf
[ June 13, 2005, 03:57 PM: Message edited by: infinity ]
NYC is under the 2002 NEC with a list of amendments under Local Law #81. The only amendment that I see is this:
645.5(D)(5)(c)-deleted reference to cable types NPLF and FPL.
So it would seem that all of the provisions of Article 645 in the 2002 NEC would apply to installations in NYC. Rigid conduit is permitted but not required. Here is the link to Local Law #81.
http://www.nyc.gov/html/dob/downloads/pdf/sec4a_ll_81_2003.pdf
[ June 13, 2005, 03:57 PM: Message edited by: infinity ]
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Re: NYC- Raised Floor Cabling
[ June 13, 2005, 04:41 PM: Message edited by: infinity ]
Steve may be correct. I assumed that this was in a room covered under Article 645. It may or may not be. If it's not under 645 than 300.22(B) would apply. Local Law #81 does not change the requirements outlined in 300.22(B) with the exception of it including the words "fire rated spaces" in addition to the words ducts or plenums.
[ June 13, 2005, 04:41 PM: Message edited by: infinity ]
ron
Senior Member
- Location
- New York, 40.7514,-73.9925
Re: NYC- Raised Floor Cabling
You do not have to use rigid. Many of the local union EC's require rigid, some engineering specs may require rigid, but no code requirement.
You do not have to use rigid. Many of the local union EC's require rigid, some engineering specs may require rigid, but no code requirement.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Re: NYC- Raised Floor Cabling
Why would an electrical contractor require the use of rigid conduit? Don't engineers usually spec the materials used? And who would pay for it? Seems like a much more expensive installation.
- Location
- Massachusetts
Re: NYC- Raised Floor Cabling
Also to keep the workers off the bench.
Of course the reason given will be about quality and safety.
To raise the price of the job.
Also to keep the workers off the bench.
Of course the reason given will be about quality and safety.
ron
Senior Member
- Location
- New York, 40.7514,-73.9925
Re: NYC- Raised Floor Cabling
Bob's got it!
Bob's got it!
Re: NYC- Raised Floor Cabling
All is becoming clear...this would be union work in a data center in NYC. We are planning new work in an existing space that has rigid everywhere. I wanted to know where I stood before we put the SOW together. I was told that the maximum length that could be flexible was 6 feet.
Just to be more clear - we are adding new circuits to a data center with a raised floor. I have used the flexible ?bluish covered metal cable (Sealtite?))with an outlet at the end (L5-20), from the PDU in the room and left under the tile where the circuit was required. As you can guess I am not an electrician!
[ June 14, 2005, 09:44 AM: Message edited by: cdiangelo ]
All is becoming clear...this would be union work in a data center in NYC. We are planning new work in an existing space that has rigid everywhere. I wanted to know where I stood before we put the SOW together. I was told that the maximum length that could be flexible was 6 feet.
Just to be more clear - we are adding new circuits to a data center with a raised floor. I have used the flexible ?bluish covered metal cable (Sealtite?))with an outlet at the end (L5-20), from the PDU in the room and left under the tile where the circuit was required. As you can guess I am not an electrician!
[ June 14, 2005, 09:44 AM: Message edited by: cdiangelo ]
Re: NYC- Raised Floor Cabling
This may be your problem. You are limited in length as to the amount of flex cable that can be unsecured/unsupported. I think its 4', but would have to look it up and it may depend on which type of conduit.
In an NEC 645 area, you can have the flex conduits totally unsecured IF THEY ARE A UL LISTED ASSEMBLY. This was the killer for us. Our plant electricians can't do this, but an outside contractor can. Every time we use this contractor for this reason, the facilities electricians scream union busting. This approach may still not be satisfactory, as the practice of running power cords through a hole in the floor to a box on the concrete is discouraged. With listed DP power cords, you can do this. However, none of our computers come with DP stamped cords. So this forces you to mount the outlet box near the surface of the raised floor.
Our plant electricians use EMT under the floor with compression fittings and then use short whips of flex at the end to provide some choice as to where the outlet will actually be located. I like long runs of sealtite much better from an operations point of view.
This may be your problem. You are limited in length as to the amount of flex cable that can be unsecured/unsupported. I think its 4', but would have to look it up and it may depend on which type of conduit.
In an NEC 645 area, you can have the flex conduits totally unsecured IF THEY ARE A UL LISTED ASSEMBLY. This was the killer for us. Our plant electricians can't do this, but an outside contractor can. Every time we use this contractor for this reason, the facilities electricians scream union busting. This approach may still not be satisfactory, as the practice of running power cords through a hole in the floor to a box on the concrete is discouraged. With listed DP power cords, you can do this. However, none of our computers come with DP stamped cords. So this forces you to mount the outlet box near the surface of the raised floor.
Our plant electricians use EMT under the floor with compression fittings and then use short whips of flex at the end to provide some choice as to where the outlet will actually be located. I like long runs of sealtite much better from an operations point of view.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Re: NYC- Raised Floor Cabling
When you say rigid are you saying threaded Aluminum or Galvanized Rigid Conduit? Or could it possibly be EMT?
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