ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
UL 508A SPACING
by ale348 - 03/29/24 01:09 AM
Increasing demand factors in residential
by tortuga - 03/28/24 05:57 PM
Portable generator question
by Steve Miller - 03/19/24 08:50 PM
Do we need grounding?
by NORCAL - 03/19/24 05:11 PM
240V only in a home and NEC?
by dsk - 03/19/24 06:33 AM
New in the Gallery:
This is a new one
This is a new one
by timmp, September 24
Few pics I found
Few pics I found
by timmp, August 15
Who's Online Now
1 members (ale348), 302 guests, and 14 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#97806 03/28/06 05:46 PM
Joined: Jan 2004
Posts: 1,507
G
Member
Based on the 2002 NFPA72, is it now permissible to have the outgoing and return conductors in the same bridle rings when installing a Class A fire alarm circuit??

[This message has been edited by George Little (edited 03-28-2006).]


George Little
Stay up to Code with the Latest NEC:


>> 2023 NEC & Related Reference & Exam Prep
2023 NEC & Related Reference & Study Guides

Pass Your Exam the FIRST TIME with the Latest NEC & Exam Prep

>> 2020 NEC & Related Reference & Study Guides
 

#97807 03/28/06 06:31 PM
Joined: Mar 2002
Posts: 582
R
Ron Offline
Member
Generally yes, same bridle ring, different cable, unless specified by Contract differently.

6.4.2.2.2 All styles of Class A circuits using physical conductors (e.g., metallic, optical fiber) shall be installed such that the outgoing and return conductors, exiting from and returning to the control unit, respectively, are routed separately. The outgoing and return (redundant) circuit conductors shall not be run in the same cable assembly (i.e., multi-conductor cable), enclosure, or raceway.

Exception: The outgoing and return (redundant) circuit conductors shall be permitted to be run in the same cable assembly, enclosure, or raceway under any of the following conditions:
(1) For a distance not to exceed 3 m (10 ft) where the outgoing and return conductors enter or exit the initiating device, notification appliance, or control unit enclosures.
(2) Single conduit/raceway drops to individual devices or appliances.
(3) Single conduit/raceway drops to multiple devices or appliances installed within a single room not exceeding 92.9 m2 (1000 ft2) in area.

[This message has been edited by Ron (edited 03-28-2006).]

[This message has been edited by Ron (edited 03-28-2006).]


Ron
#97808 03/28/06 11:26 PM
Joined: Jan 2004
Posts: 1,507
G
Member
What happened to the required spacing (recommended) called out in the appendix?


George Little
#97809 03/31/06 12:02 AM
Joined: Mar 2002
Posts: 582
R
Ron Offline
Member
The annex text is still there, but Annex A is not a part of the requirements of the NFPA document but is included for informational purposes only.

A.6.4.2.2.2
A goal of 6.4.2.2.2 is to provide adequate separation between the outgoing and return cables. This separation is required to help ensure protection of the cables from physical damage. The recommended minimum separation to prevent physical damage is 305 mm (1 ft) where the cable is installed vertically and 1.22 m (4 ft) where the cable is installed horizontally.



[This message has been edited by Ron (edited 03-30-2006).]


Ron

Link Copied to Clipboard
Powered by UBB.threads™ PHP Forum Software 7.7.5