ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
T8 to LED retrofit-ballast or bypass?
by gfretwell - 01/19/21 08:05 PM
From an outsider- How does tipping work?
by NORCAL - 01/17/21 05:26 AM
Can I ask for your input?
by electure - 01/16/21 07:04 PM
Ground fault remover :-)
by NORCAL - 01/16/21 10:29 AM
Photo Editing Software?
by grich - 01/13/21 11:18 AM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
0 registered members (), 17 guests, and 19 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
T rating of a switch #220790 05/10/20 02:22 PM
Joined: Apr 2013
Posts: 4
R
Rob2019 Offline OP
New Member
1) What does it mean by *T rating of a switch*?

2) Where can I find more info on different types of general purpose switches?

Tools for Electricians:
Re: T rating of a switch [Re: Rob2019] #220796 05/15/20 04:44 PM
Joined: Aug 2011
Posts: 22
G
grich Offline
Member
T means the switch is rated for switching tungsten lamp loads...the switch contacts can handle the momentary inrush current that the cold filaments will draw.

Re: T rating of a switch [Re: Rob2019] #220798 05/16/20 12:27 AM
Joined: Jul 2002
Posts: 8,374
Trumpy Offline
Member
Rob,
Welcome to ECN,
What sort of a switch is this and what sort of application is this being used in?
I suspect that the T rating, as you refer to is the Thermal Current rating.
Switches, if they are going to be used to interrupt/make inductive loads depend heavily on "AC Ratings", like AC-3 or the like, otherwise the switch contacts will be seriously damaged by the arc created when the contacts open or close.

Re: T rating of a switch [Re: Trumpy] #220807 05/16/20 09:52 PM
Joined: Apr 2013
Posts: 4
R
Rob2019 Offline OP
New Member
Got the reply from another member; Grich

T-switches means the switch is rated for switching tungsten lamp loads....the switch contacts can handle the momentary inrush current that the cold filaments will draw.

Re: T rating of a switch [Re: Rob2019] #220810 05/17/20 02:13 PM
Joined: Dec 2002
Posts: 204
G
geoff in UK Offline
Member
Interesting but confusing. I'll admit I hadn't heard of T rating and was waiting for an informed answer.
However, I've always thought inductive loads much more demanding of switches, so is T rating a "plus", or more a limitation?


Featured:

2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Posts: 362
Joined: April 2003
Show All Member Profiles 
Top Posters(30 Days)
Trumpy 15
NORCAL 10
Popular Topics(Views)
274,056 Are you busy
207,838 Re: Forum
195,521 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3