ECN Forum Forums General Topics of the Trade General Discussion Area Non-CTL panel

sparky,
One would think so. But with these minis that are notched deep enough to fit into almost any panel, one could conceivably end up with 80 OCPDs. Even on a panel that doesn't have a clear "CTL" rating, we should be bound by the NEC limitation of a maximum of 42 OCPDs. But how is Joe-handyman to know this!?

The Class CTL rating allows the use of listed "twin" or "half-size" breakers.

If there is no Class CTL label in the panel than only full size breakers may be used. It is always up to the installer (and AHJ) to install equipment as it is intended (listed).

Cheater breakers (breakers that do not contain a rejection feature) are for replacement use in only old non-Class CTL panels (of course the old panel had to be listed for these breakers).

JBD,

The upper limit should still be 42 breakers, correct? I assume a mini counts as 2 OCPDs. You could conceivably install 30 minis in a 30 ckt. panel and have 60 OCPDs. This would be a violation of 408.15.

[This message has been edited by Redsy (edited 01-09-2002).]

It would not be possible if you are using Class CTL breakers. A Class CTL panel is designed within the 42 circuit limitation.

Non-Class CTL breakers should not to be used. If you cheat and put them into non-approved panels then you are misapplying them. The installer accepts all risk associated with the misapplication of electrical equipment.