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

>> Home   >> Electrical-Photos   >> Classifieds   >> Subscribe to Newsletter   >> Store  
 

Photos of the Week:

Wire Your House $17.95
Wire Your House $17.95

Random Gallery Image:
Recent Gallery Topics:
What in Tarnation?
What in Tarnation?
by timmp, September 10
Plumber meets Electrician
Plumber meets Electrician
by timmp, September 10
Who's Online Now
0 members (), 528 guests, and 19 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Mar 2005
Posts: 16
J
JoeMed Offline OP
Member
Typical doorbell transformer in the panel. I rarely see this but can any one direct me to why or why not, in the NEC 2002, for this type of installation.
Thanks Joe

Horizontal Ad
Joined: Jul 2004
Posts: 10,015
Likes: 37
G
Member
Do you mean mounted in a 1/2" KO in the panel? (only the line voltage leads inside) Otherwise how are you separating the class 2 wiring from the line voltage?


Greg Fretwell
Joined: Mar 2005
Posts: 16
J
JoeMed Offline OP
Member
thanks for responding, No mounted inside the panel. no separation, all romex install, the low-v wires go out in an opening in the panel, panel is an exterior installation

[This message has been edited by JoeMed (edited 06-02-2005).]

Joined: Jul 2004
Posts: 10,015
Likes: 37
G
Member
725.55 ?


Greg Fretwell
Joined: Mar 2005
Posts: 16
J
JoeMed Offline OP
Member
I'm ckecking it out and re-re reviewind article 450

Joined: Jul 2004
Posts: 10,015
Likes: 37
G
Member
"JoeMed I'm ckecking it out and re-re reviewind article 450"

Look at 450.1 ex2

450.1 Scope.
This article covers the installation of all transformers.

Exception No. 3: Transformers used with Class 2 and Class 3 circuits that comply with Article 725.


Greg Fretwell
Joined: Mar 2005
Posts: 16
J
JoeMed Offline OP
Member
I need clarification on Class 1,2 and 3. Under 725 class 1 not more than 30v.
Can you advise? 725.21 (A)

Horizontal Ad
Joined: Jul 2004
Posts: 10,015
Likes: 37
G
Member
The short answer is
Class 1, not current limited, treated virtually the same as "power"
Class 2, low voltage, current limited, like your doorbell.
Class 3, higher voltage, still current limited, like a phone line.


Greg Fretwell

Link Copied to Clipboard
Advertisement:-Right


Tools for Electricians
Tools for Electricians
 

Member Spotlight
noderaser
noderaser
Portland, Oregon, United States
Posts: 404
Joined: March 2007
Top Posters(30 Days)
Admin 3
Popular Topics(Views)
365,160 Are you busy
288,035 Re: Forum
266,704 Need opinion
New Page 2
Powered by UBB.threads™ PHP Forum Software 7.7.5