Seismic Supporting

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Alwayslearningelec

Senior Member
Location
NJ
Occupation
Estimator
My spec says that seismic is required for lighting fixtures and some other misc equip. How is this achieved. Thanks. I remember a past estimator saying ..."ah it's in the conduit number".

Thanks
 
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Cooper B-Line's New Seismic Fixture Clamps

[ Download Product Sheet ]

Features:

* BA-SFC Series provides seismic restraint for light fixtures within a suspended ceiling.
* Labor saving installation - B-Line's BA-SFC Series securely attached light fixtures to the ceiling T-bar frame and eliminates dropping additional wires or chains.
* Provides positive rigid attachment of light fixtures to ceiling grid members, in compliance with ICBO Acceptance Criteria 184 (AC 184).
* Satisfies NEC 410.16(C) which requires positive attachment for secure fastening of luminaries.
* Load rating: 200 lbs.

UPC/Part No.

Catalog No.

Description

Box Qty.
78205145911

BA-SFC

Seismic Fixture Clamp (set of 4) for attachment of one standard 2" x 4" light fixture to T-bar ceiling.

25 sets
78205145912

BA-SFC-E

Seismic Fixture Clamp (set of 2) for attachment of two standard 2" x 4" light fixtures end-to-end onto T-bar ceiling.

25 sets
78205145913

BA-SFC-S

Standard 2" x 4" light fixtures side-by-side onto T-bar ceiling. Requires one set of BA-SFC to complete system.

25 sets
78205145914

BA-SFC-CF

Standard 2" x 2" light fixtures to T-bar ceiling. Requires one set of BA-SFC to complete system.

50 sets
78205145915

BA-SFC-CFS

Seismic Fixture Clamp (set of 2) for reinforcement of main runner connection joints.

100 sets
 
Depending on where you're at you'll probably need 2 or 4 wires tied off to each fixture depending on local building codes. Same type as are tied off to the grid.
 
Here, on some larger jobs the means of support is spelled out by the engineer as part of the Building Code requirements.
In every day practice, on the smaller jobs, the requirement varies a little from jurisdiction to jurisdiction with most requiring 1 independant support tied to corners of 2x2 and smaller fixtrures and 1 independant support on each end of 2x4 fixtures.
Often times the E/C will contract out the anchoring and support wires to the ceiling installer.
Take a look at 300.11 for some help.

Here is a typical requirement from specs:
V. LIGHT FIXTURE SUPPORTS ​
​
[FONT=Arial,Arial][FONT=Arial,Arial]– Due to seismic conditions, only "Heavy-Duty" ceiling systems may be used. ​

A[/FONT][/FONT]. [FONT=Arial,Arial][FONT=Arial,Arial]All light fixtures shall be attached (with approved screws or clips) to the suspended ceiling grid systems at two opposing sides.
B. Wires required to support the fixture:
1. Fixtures less than 10 lbs: One #12 gage hanger wire from the fixture housing to the structure above. This wire may be slack.
2. Fixtures between 11 to 55 lbs: Two #12 gage hanger wires connected from the fixture housing to the structure above. These wires may be slack.
3. Fixtures 56 lbs or more shall be supported directly from the structure above without using the ceiling suspension system for direct support.
4. Pendant Hung Fixtures shall be supported with # 9 gage wire without using the ceiling suspension system for direct support
[/FONT][/FONT]
 
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