The Electrical Contractor Network

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

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!


2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
Parking lot pole light swap....
by gfretwell
Yesterday at 08:46 PM
International Wire Colour Codes
by Tjia1981
10/23/16 12:08 PM
Son of Sparky
by HotLine1
10/20/16 07:43 PM
Speaking of Plugmold ...
by gfretwell
10/17/16 02:37 PM
Broken battery charger? Check for cobwebs!
by gfretwell
10/17/16 02:30 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 14
ghost307 7
HotLine1 7
renosteinke 6
Potseal 4
Who's Online
0 registered (), 299 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#23705 - 03/25/03 05:39 PM Panels
LuminateME1 Offline

Registered: 03/06/03
Posts: 25
Loc: Seattle,WA,USA
20/20 panels 24/40 panels--I have an idea of what this is all about, but would love to hear your clarification of panels. A 20/20 can handle 20 circuits, with 20 breakers only. Please .............join in

Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#23706 - 03/25/03 05:51 PM Re: Panels
txsparky Offline

Registered: 05/25/01
Posts: 578
Loc: Magnolia,.Texas U.S.A.
A 20/20 panel can use only 20 full size breakers.A 20/40 can use 20 full size,40 minis or any combination in between.You are not to exceed the 40 breaker maximum by adding piggyback style breakers.

[This message has been edited by txsparky (edited 03-25-2003).]

#23707 - 03/25/03 05:56 PM Re: Panels
HotLine1 Offline


Registered: 04/03/02
Posts: 6792
Loc: Brick, NJ USA
The way I understand it:
20/20 means that the panel is built & listed for 20 branch circuit poles. (20 single poles or 10 double poles, or any combo to 20)
This also indicates that "full size breakers are "only" allowed in this panel.

24/40 means 24 full size breakers (24 poles)
or by installing listed "twins" or "piggy back" a maximum of 40 poles. The panel buss is supposed to be manufactured with a means to prevent the insertion of "twins" in excess of the "listed" quantity.


#23708 - 03/25/03 07:39 PM Re: Panels
LK Offline


Registered: 01/21/03
Posts: 1721
Loc: New Jersey
How about C-H Panel 100Amp 30 space has anyone used this panel.


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