Flexible cords through raised cleanroom floor.

[stevenielsen]

Would 400.14 allow you to run flexible cords through and under a clean room raised floor when only qualified persons are servicing the installation?

 

[barbeer]

Better to say 400.3 and 400.8 would prohibit the use in this instance. IMHO of course

 

[infinity]

If this room falls under Article 645 you'll need to look at 645.5(B).

 

[cowboyjwc]

I agree with barbeer though I really don't want to and infinity typed just what I was going to say.

Barbeer the only reason I don't want to agree is that I don't really see a problem with it per say.

 

[barbeer]

Good find- thats way back there!

 

[infinity]

Good find- thats way back there!

Yes, rooms constructed under the highly restrictive Article 645 do have some advantages. A relaxation of the some of the wiring methods permitted is one of them.

 

[Pierre C Belarge]

645.5(B) Cord-and Plug Connections. The data processing system shall be permitted to be connected to a branch circuit by any of the following LISTED means:

Take a look at 645.5(D)(5) Cables, other than those covered in (D)(2) and those complying with (D)(5(a), (D)(5(b), or (D)(5)(c), shall be listed as Type DP



UL White Book
Data Processing Cable (EMRB)DP-1, DP-1P, DP-2, DP-2P, DP-3, DP-3P

A whole list of requirements here.

 

[ron]

Pierre,
Check out this ROC for the next code cycle:

12-82 Log #688 NEC-P12 Final Action: Accept
(645.5(D) (New) )​

________________________________________________________​

Submitter:​

Timothy M. Croushore, Allegheny Power​

Comment on Proposal No:​

12-114​

Recommendation:​

Revise the main text of 645.5(D) to read as follows:
(D) Under Raised Floors. Power cables, communications cables, connecting
cables, interconnecting cables, cord-and-plug connections, and receptacles associated with the information technology equipment shall be permitted under a raised floor, provided the following conditions are met:
Add a new (3) ahead of the existing (3). Renumber existing (3) through (6) to (4) through (7). The new (3) is as follows: (3) Supply cords of listed information technology equipment in accordance with 645.5(B).
Revise the text of existing (4) and renumber it to (5) as recommended above. The revised text and revised number are as follows: (5) Openings in raised floors for cords and cables protect cords and cables against abrasion and minimize the entrance of debris beneath the floor.​

Substantiation:​

These suggested revisions comply with the intent of the
original submitter. These revisions are discussed in my affirmative ballot
comment. Cords are manufactured differently than cables due to the
requirements for flexibility of the cord. There is confusion in the industry
whether cord-and-plug connections from listed information technology
equipment supply cords are permitted under the raised floor. This proposal
permits listed cords under a raised floor where the length of the supply cord and attachment plug cap does not exceed 15 feet in length. Should any portion of the cord be on the surface of the raised floor, the requirement for protection from physical damage would apply.​

Panel Meeting Action: Accept
Number Eligible to Vote: 12
Ballot Results:​

Affirmative: 12​

 

[Pierre C Belarge]

Thanks Ron for the heads up on this possible change.