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Old 03-25-2013, 07:43 PM   #1
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Can I tie two breakers together to make a 240v breaker?


I know about how both sides of a 240v circuit must be off, or there will be voltage at a 240v device; but what is wrong with tying two 120v breakers together?

I assume it isn't allowed because a 240v breaker is 50% more than 2 120v breakers; but I have a bunch of 120vs and I need a 240v, so I am just wondering what the problem is.

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Old 03-25-2013, 07:52 PM   #2
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Can I tie two breakers together to make a 240v breaker?


Factory 240v/2 pole breakers have internal common trip, something lacking from 2 handletied 120v/single pole breaker, therefore not allowed to be used in line to line applications

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Old 03-25-2013, 08:22 PM   #3
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Can I tie two breakers together to make a 240v breaker?




Maybe I'm the one misunderstanding...240.20(B)(2)
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Old 03-25-2013, 08:27 PM   #4
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Can I tie two breakers together to make a 240v breaker?


The problum is you need a double poled breaker not two singles.
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Old 03-25-2013, 08:54 PM   #5
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Can I tie two breakers together to make a 240v breaker?


I guess I'm misunderstanding then. Fair enough. Had the reference wrong...240.15(B)...

Quote:
240.15 Ungrounded Conductors.
(A) Overcurrent Device Required. A fuse or an overcurrent
trip unit of a circuit breaker shall be connected in
series with each ungrounded conductor. A combination of a
current transformer and overcurrent relay shall be considered
equivalent to an overcurrent trip unit.
Informational Note: For motor circuits, see Parts III, IV, V,
and XI of Article 430.
(B) Circuit Breaker as Overcurrent Device. Circuit breakers
shall open all ungrounded conductors of the circuit both
manually and automatically unless otherwise permitted in
240.15(B)(1), (B)(2), (B)(3), and (B)(4).

(1) Multiwire Branch Circuit. Individual single-pole circuit
breakers, with identified handle ties, shall be permitted
as the protection for each ungrounded conductor of multiwire
branch circuits that serve only single-phase line-to neutral
loads.
(2) Grounded Single-Phase Alternating-Current Circuits.
In grounded systems, individual single-pole circuit
breakers rated 120/240 volts ac, with identified handle ties,
shall be permitted as the protection for each ungrounded
conductor for line-to-line connected loads for single-phase
circuits.
I understand the red section....manually and automatically (I.E. - internally and externally, yes?)...

Doesn't the blue section override that as "otherwise permitted in ......"

Not arguing, simply asking
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Old 03-25-2013, 08:59 PM   #6
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Can I tie two breakers together to make a 240v breaker?


Quote:
Originally Posted by jproffer View Post
I guess I'm misunderstanding then. Fair enough. Had the reference wrong...240.15(B)...



I understand the red section....manually and automatically (I.E. - internally and externally, yes?)...

Doesn't the blue section override that as "otherwise permitted in ......"

Not arguing, simply asking

you're correct, but the correct 'identified handle tie' will usually cost the same as or more than a standard current plug on circuit breaker.


I actually didn't know that exception was there, so i learned something today..
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Old 03-25-2013, 09:02 PM   #7
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Can I tie two breakers together to make a 240v breaker?


Thought maybe I was missing something...that happens

Glad we got it cleared up.

That exception might be new in '11....not sure.
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Old 03-25-2013, 09:04 PM   #8
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Can I tie two breakers together to make a 240v breaker?


Quote:
Originally Posted by jproffer View Post


Maybe I'm the one misunderstanding...240.20(B)(2)
Interesting...
I can buy a package of 3 approved handle ties for $5 and use some 120v breakers I have no use for, or buy a 240v for $18.

Have to chew on that one.
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Old 03-26-2013, 10:48 AM   #9
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Can I tie two breakers together to make a 240v breaker?


Quote:
Originally Posted by jproffer View Post
I guess I'm misunderstanding then. Fair enough. Had the reference wrong...240.15(B)...



I understand the red section....manually and automatically (I.E. - internally and externally, yes?)...

Doesn't the blue section override that as "otherwise permitted in ......"

Not arguing, simply asking
How many single pole breakers are rated 120/240V? Aren't "slash rated" single pole breakers fairly uncommon for residential panels?

EDIT: Nope, looks like almost all non-GFCI or AFCI breakers are slash rated. Is this exception a major change in the code? It looks like double pole breakers are no longer required in almost any residential application. A handle tie can be used instead. Weird.
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Last edited by mpoulton; 03-26-2013 at 10:57 AM.
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Old 03-26-2013, 10:55 AM   #10
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Can I tie two breakers together to make a 240v breaker?


I have no idea how common they are. I was just throwing that code reference into the conversation.
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Old 03-26-2013, 05:03 PM   #11
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Can I tie two breakers together to make a 240v breaker?


Quote:
Originally Posted by mpoulton View Post
How many single pole breakers are rated 120/240V? Aren't "slash rated" single pole breakers fairly uncommon for residential panels?

EDIT: Nope, looks like almost all non-GFCI or AFCI breakers are slash rated. Is this exception a major change in the code? It looks like double pole breakers are no longer required in almost any residential application. A handle tie can be used instead. Weird.


exception exists at least as far back as the 2002 code.(240.20 prior to 08)

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