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T/N/C Switch

07/30/2014 7:20 AM

What is TNC Switch & its function in ACB Panel?

If possible then please explain with the help of SLD.....

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Pathfinder Tags: ACB TNC SWITCH
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#1

Re: T/N/C Switch

07/30/2014 7:44 AM

OMG WTF

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#2
In reply to #1

Re: T/N/C Switch

07/30/2014 8:05 AM

???????

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#10
In reply to #2

Re: T/N/C Switch

07/30/2014 2:32 PM

He said WTF. Look it up.

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#3

Re: T/N/C Switch

07/30/2014 8:30 AM

Read this

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#12
In reply to #3

Re: T/N/C Switch

07/31/2014 1:45 AM

Already gone through it...

none of them are satisfactory......

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#4

Re: T/N/C Switch

07/30/2014 9:15 AM

Do stop using TLAs, Murphy.

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#5

Re: T/N/C Switch

07/30/2014 9:52 AM

I've got to go in to town later, I'll call in at The Nottingham Company and ask.

I get the feeling I'll get blank looks.

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#6

Re: T/N/C Switch

07/30/2014 10:44 AM

Thought it was Hand/Off/Auto in another language, but I can't find one that translate to those letters. Still could be as the term Auto and Off may not be what it is considered in, say, French, as technical terms aren't always the direct translation that you would expect.(i.e. - they use a different term than Off for not activated) I've spent many wasted hours trying to comprehend French drawings trying to translate using a standard translation guide. For technical terms, you need a technical translator, and that usually means - call an engineer over there.

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#7
In reply to #6

Re: T/N/C Switch

07/30/2014 11:33 AM

I worked for a French company. Never seen TNS as a switching option.

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#8
In reply to #7

Re: T/N/C Switch

07/30/2014 11:41 AM

Okay - so now we need to hear from the Germans, the Spanish, the Italians, the Japanese, the Scandinavian countries,.....

Thank you - we can eliminate that one - I never said it was French - just another language than English.

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#9

Re: T/N/C Switch

07/30/2014 2:31 PM

TN-C is a method of providing an Earth connection. Is that what you are talking about?

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#11
In reply to #9

Re: T/N/C Switch

07/30/2014 10:20 PM

TN-C Terra Neutral - Combined. AKA CNE/PME

Which you can switch so long as the combined neutral/earth is early make, late break.

It would help if the OP told us the full details.

Can someone tell me what SLD is please?

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#14
In reply to #11

Re: T/N/C Switch

07/31/2014 2:56 AM

SLD = Single Line Diagram or what I used to call a "schematic".

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#21
In reply to #14

Re: T/N/C Switch

07/31/2014 9:04 AM

Ooopps

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#13

Re: T/N/C Switch

07/31/2014 2:09 AM

TNC a trip-nutral-close switch. Normally it stays at nutral position and indication of breakers' status is with indication lamps else the switch has to stay in trip/nutral / close positions to indicate. Trip -- switching off the breaker and close - switching ON. In another nomanclature TNC is test nutral and close switch where in T est is a position load is not connected i.e breaker output id open and the functions of the breakers will be avaiable for testing purposes. In close position the breaker will get connected to load sooner it is switched on ( closed). Nutral position the breaker is drawn out and no way connected to power and available for repairs and can coolly be taken out of the cubicle. But mostly these switches are mechanical

THE FIRST COMBINATION IS MOST COMMON.

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#15
In reply to #13

Re: T/N/C Switch

07/31/2014 3:09 AM

Thx for the clarification.... it helps a lot, can you please post one sample SLD if possible...

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#19
In reply to #15

Re: T/N/C Switch

07/31/2014 7:10 AM

NOT able to load file. I want to know from someone... which format is allowed here for posting a drawing/ circuit etc.

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#20
In reply to #13

Re: T/N/C Switch

07/31/2014 7:58 AM

http://www.larsentoubro.com/lntcorporate/uploads/product/C-Power%20Manual.pdf

See page 8-19 for TNS and Sample circuit SLD.

http://www.allinterview.com/showanswers/60633.html

See this for detals of TNC types ( Some one has already refered to this)

http://www.gepowercontrols.com/ex/resources/literature_library/catalogs/industrial_components/downloads/Record_Plus_Catalogue_EN_Export_ed09-11_680860.pdf --- Another manual mentioning TNC and control ckt. Pls go thru for detailing.

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#16

Re: T/N/C Switch

07/31/2014 3:41 AM

Isn't there a manual for this panel, Boss?

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#17
In reply to #16

Re: T/N/C Switch

07/31/2014 3:55 AM

Not available in manual because we need to integrate it in existing ACB Panel

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#18

Re: T/N/C Switch

07/31/2014 4:24 AM

It is a 3 position switch. In Trip Position, CB Trips (Energized thru Shunt Coil of CB). In Close Position, CB Closes or can be made ON (Energized thru Closing Coil of CB). In Neutral Position all the operations on AUTO mode or from REMOTE can be done, as per user scheme.
You have normal TNC and TNC with Spring Return. In Spring Return TNC, the switch returns to Neutral Position and hence cannot be locked either on TRIP or CLOSE position (Required to isolate the closing/trip coil which may be short-time rated). Normal TNC can be locked on either TRIP or CLOSE Position.
These switches are also called as Breaker Control Switches.

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