ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

Page 1 of 2 1 2 >
Topic Options
Rate This Topic
#15188 - 10/09/02 04:46 PM TVSS question
sparky Offline
Member
Registered: 10/18/00
Posts: 5303
I have a BV bb Q here that i cannot answer, any help appreciated...

Quote:
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.
Frank


~Steve
Top
Work Gear for Electricians and the Trades
#15189 - 10/09/02 04:59 PM Re: TVSS question
HotLine1 Online   content


Member
Registered: 04/03/02
Posts: 6776
Loc: Brick, NJ USA
Sparky:
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)
John
_________________________
John
Top
#15190 - 10/09/02 08:58 PM Re: TVSS question
wolfdog Offline
Member
Registered: 10/24/01
Posts: 135
Loc: Dallas,TX
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.
Top
#15191 - 10/10/02 12:09 AM Re: TVSS question
Scott35 Offline

Broom Pusher and
Member
Registered: 10/19/00
Posts: 2707
Loc: 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.


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!
Top
#15192 - 10/10/02 03:56 AM Re: TVSS question
sparky Offline
Member
Registered: 10/18/00
Posts: 5303
thannks guys;
i think i'll refer the individual to this thread, maybe then we can be more specific
Top
#15193 - 10/10/02 07:08 AM Re: TVSS question
JBD Offline
Member
Registered: 07/12/01
Posts: 599
Loc: WI, USA
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
Top
#15194 - 10/10/02 02:44 PM Re: TVSS question
Frank Cinker Offline
Member
Registered: 07/29/01
Posts: 311
Loc: Pennsylvania
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.
Top
#15195 - 10/10/02 05:26 PM Re: TVSS question
HotLine1 Online   content


Member
Registered: 04/03/02
Posts: 6776
Loc: Brick, NJ USA
Frank:
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.

John
_________________________
John
Top
#15196 - 10/11/02 03:19 AM Re: TVSS question
Frank Cinker Offline
Member
Registered: 07/29/01
Posts: 311
Loc: Pennsylvania
John-
That's kind of what I thought. Thanks for the information. I'll return it this weekend and get the proper TVSS.
Frank
Top
#15197 - 10/11/02 09:09 AM Re: TVSS question
tdhorne Offline
Member
Registered: 03/22/01
Posts: 345
Loc: Maryland, USA
Frank

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
_________________________
Tom Horne

"This alternating current stuff is just a fad. It is much too dangerous for general use" Thomas Alva Edison
Top
Page 1 of 2 1 2 >

Member Spotlight
Member Since: 02/23/13
Posts: 204
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
1 registered (HotLine1), 111 Guests and 7 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 51
HotLine1 43
gfretwell 17
Trumpy 16
Ruben Rocha 13
 
Newest Members
clee512, Jdscott2005, FAIZAN, Regitest2, sureshazhagai

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals