ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
Recent Posts
Why cables look like they do
by LongRunner. 04/26/17 09:36 AM
Dimmable LED 2x4 lay in fixtures
by HotLine1. 04/24/17 05:43 PM
Old decora style outlets
by Lostazhell. 04/22/17 07:59 PM
Permit Snafus...AHJs and Contractors Jump in
by gfretwell. 04/22/17 01:11 PM
How do you find a good employee?
by HotLine1. 04/22/17 10:44 AM
New in the Gallery:
SE cable question
Popular Topics(Views)
234,727 Are you busy
169,482 Re: Forum
162,774 Need opinion
Who's Online Now
1 registered members (LongRunner), 74 guests, and 8 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
Page 1 of 2 1 2
#15188 - 10/09/02 07:46 PM TVSS question  
sparky  Offline
Joined: Oct 2000
Posts: 5,306
I have a BV bb Q here that i cannot answer, any help appreciated...

It installs in a 1/2 inch KO in panelboard. It is connected to a two pole 20 amp circuit breaker. The service panel is: 200Amp., 120/240V, single phase. There are three conductors on the TVSS, two black and one green.
When looking through catalogs I've often seen the same type with two black, one white and one green conductor. I guess my question is: What is the difference if any.


Work Gear for Electricians and the Trades

#15189 - 10/09/02 07:59 PM Re: TVSS question  
HotLine1  Offline

Joined: Apr 2002
Posts: 6,809
Brick, NJ USA
IF you are talking "Sentrex" TVSS, by Wiremold, they come in many flavors:
1 phase, 4 wire, 120/240 volt
3 phase, 5 wire (Y & Delta)
1 phase, 3 wire; 120/240 volt
3 phase, 4 wire;120/208Y
3 phase, 4 wire; 277/480 Y

Some have a neutral, some don't; all have grounds,to the best of my knowledge.
More info at Wiremold Website
(Damn, if I knew how to make a link, and where the "trademark" symbol is; oh well, I'm a 'lectrician, not a computer wiz)


#15190 - 10/09/02 11:58 PM Re: TVSS question  
wolfdog  Offline
Joined: Oct 2001
Posts: 135
Panamx is designed for a 2 pole 240 volt breaker. They have two black wires and one green.

Maybe his is designed for 120 volt operation and protects two 120 volt lines.

#15191 - 10/10/02 03:09 AM Re: TVSS question  
Scott35  Offline

Broom Pusher and
Joined: Oct 2000
Posts: 2,707
Anaheim, CA. USA
From the description, it sounds like a 240 VAC 1 Phase 2 wire TVSS device.
This would be connected via a 2 pole c/b.

Maybe the Person that posted this Q' could add some Specs from the TVSS device, such as System Voltage.

I am 90% [0.9] sure this would be used on a 200 - 240 VAC 1 Phase 2 Wire type system. Not sure how helpful it would be for 120/240 VAC 1 Phase 3 Wire systems, since there is no connection for the Grounded Noodle Conductor, but that's another story.
[Linked Image]

Scott S.E.T.

p.s. let me know if I guessed correctly, or failed the "Whaddaheck Is This TVSS Device" test.

Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!

#15192 - 10/10/02 06:56 AM Re: TVSS question  
sparky  Offline
Joined: Oct 2000
Posts: 5,306
thannks guys;
i think i'll refer the individual to this thread, maybe then we can be more specific
[Linked Image]

#15193 - 10/10/02 10:08 AM Re: TVSS question  
JBD  Offline
Joined: Jul 2001
Posts: 599
The number of wires indicate what type of protection you will have.

Line to Line, and Line to Ground - multiple blacks and a green only
Line to Neutral(noodle) and Line to Ground - 1 black, 1 white, and 1 green
Line to Line, Line(s) to Neutral, Line(s) to Ground - multiple blacks, 1 white, and 1 green

#15194 - 10/10/02 05:44 PM Re: TVSS question  
Frank Cinker  Offline
Joined: Jul 2001
Posts: 311
My electrical service is: 120/240V, 3W, single phase, 200 amps.
It sounds as if I should of purchased a TVSS with 2 black wires, one white and one green instead of 2 black wires and one green. Actually I grabbed the last one on the shelf at Home Depot. I didn't bother to even look at it until I got home. I assumed all TVSS came with a white (neutral) conductor.
The instructions indicated that a 15 amp 2 pole CB was necessary, which I did install.
I assume I don't have line to neutal protection.

#15195 - 10/10/02 08:26 PM Re: TVSS question  
HotLine1  Offline

Joined: Apr 2002
Posts: 6,809
Brick, NJ USA
IMHO, you do not have line to neutral (120 volt) protection. You have 240 volt, phase to phase protection. You could put it back in the box, & take it back to the orange apron store, like a lot of people do. They usually don't check to careful. It goes back on the shelf, and someone else "gets it".
There's a lot of "used" stuff that gets back on the shelves.



#15196 - 10/11/02 06:19 AM Re: TVSS question  
Frank Cinker  Offline
Joined: Jul 2001
Posts: 311
That's kind of what I thought. Thanks for the information. I'll return it this weekend and get the proper TVSS.

#15197 - 10/11/02 12:09 PM Re: TVSS question  
tdhorne  Offline
Joined: Mar 2001
Posts: 345
Maryland, USA

The TVSS with only three conductors is suitable for use in service equipment as the grounded conductors (neutrals) and the Equipment Grounding Conductors are all attached to the Grounding Electrode Conductor at that point. Since the neutral and EGCs are common in service equipment there is no need for two conductors and two sets of MOVS in the service equipment. In panel that was not service equipment the grounded buss and the grounded conductor buss bar would be separate and one lead to connect each to the TVSS would be needed.

Tom Horne

"This alternating current stuff is just a fad. It is much too dangerous for general use" Thomas Alva Edison

Page 1 of 2 1 2

Member Spotlight
Posts: 28
Joined: February 2011
Show All Member Profiles 

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.018s Queries: 15 (0.003s) Memory: 0.8190 MB (Peak: 0.9956 MB) Zlib enabled. Server Time: 2017-04-26 13:57:01 UTC