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#85073 - 05/27/03 10:40 AM Article 285 TVSSs  
txsparky  Offline
Member
Joined: May 2001
Posts: 552
Magnolia,.Texas U.S.A.
How often do you see the TVSS double lugged to the main breaker in a panel? I see it pretty regularly [Linked Image]

However, in reading 285.21 it sounds as though that doublelugging is required. More specifically 285.21(A)(2)Feeder Supplied Building or Structure
Quote
The transient voltage surge suppressor shall be connected on the load side of the first overcurrent device at the building or structure.

Do some people interpret this a meaning attached to the first overcurrent device or what? I interpret as meaning downstream of the first device.

[This message has been edited by txsparky (edited 05-27-2003).]


Donnie

2017 / 2014 NEC & Related Books and Study Guides

#85074 - 05/27/03 01:15 PM Re: Article 285 TVSSs  
ElectricAL  Offline
Member
Joined: Oct 2001
Posts: 597
Minneapolis, MN USA
Tx,

The lugs must be listed for more than one conductor. I agree with your concern.

The TVSS works better when its leads are as short as possible / practical and when they are connected as close as possible / practical to the lowest impedance conductors in the assembly.

I've attended a couple presentations by a local power quality consulting group that cleary demonstrates the benefits of not just slapping the TVSS unit in to "get it hooked up". The best TVSS performance is achieved by reconfiguring the existing hardware enough to provide lugs as close to the main service conductors as practical, and to mount the TVSS unit to keep the leads short.


Al Hildenbrand

#85075 - 05/27/03 09:41 PM Re: Article 285 TVSSs  
Redsy  Offline
Member
Joined: Mar 2001
Posts: 2,056
Bucks County PA
Tex,
I,m confused. (Not uncommon).
If it is "double-lugged" to the main, wouldn't it likely be on the line side?



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