ECN Forum Forums General Topics of the Trade General Discussion Area 200a sub lugs

Could this "stab rating" be a Canadian requirement that is not a requirement in the states, like the shielding over the primary conductors in panels?

Roger

panels have different stabb ratings, sorry, they're not all 70amp. Either way you could not have a 200a dp circuit coming from a 200a panel. (unless the panels per stabb rating alows it)


[This message has been edited by Eddy Current (edited 12-14-2006).]

Eddy A typical 200 amp panel with a 100 amp stab rating can legally be equipped with 200 amp breaker assuming it is allowed by the manufacturer.

They get around the 100 amp per stab rating by using 2 stabs per phase.

If the breaker was for example installed at the top it would use circuit positions 1,3, and 2,4.

The large breakers in Siemens panels are a parallel 2-pole degign. They take up 4 spaces and look like a 4-pole breaker.

EDIT: Just like iwire said


[This message has been edited by u2slow (edited 12-14-2006).]

Eddy, SQ D QO 200's are the same.



Roger

Ok, I've seen a few of those - Always wondered why they were like that. Thanks guys for clearing that up for me.

I don't have any links, but cutler hammer makes a 200 amp rated lug kit for their BR series panels. I've bought a few in the last few years.

So does Siemens and Murray (Same company)...

I have seen several panels with 70 per stab ratings, but most were older models, not many have that restriction any more, for whatever reason.

U2Slow:

You sure that's not just a Siemens main breaker? That's the same arrangement that GE uses for their mains in their TM series panels. How would you handle the load connection if this breaker was plugged onto the regular bus bar? Parallel #6 conductors to the load? I don't think so.

Those four-pole breakers are for specially-designed main breaker mountings only. They have factory bus bar extensions or adapters to fit into the lugs of the breaker. Also, unlike in a regular panel where adjacent poles are on different legs, the four-pole mains are configured with the two poles on the left being on one leg and the two on the right being on the other.

The breakers like the Square D and Siemens ones that Roger and E57 posted illustrate the true four-pole breakers. They are also available (or were) available from C-H the last time I checked. They take up two poles on the left AND right side, so technically they are still occupying four full pole spaces.

I have also seen 70 amp stabs, but usually in panels that have spaces designed to accept piggyback breakers at the bottom. Since the stab isn't full-size so that piggybacks will only fit where they belong, their rating isn't as high as the full-size spaces.

[This message has been edited by EV607797 (edited 12-14-2006).]