Nec 702.6

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I'm not sure why you want to use a key interlock in stead of the MTS?
Can you please explain the situation and what you are trying to achive.
Not trying to dodge your question, but need to know more information about your system. (size of feed, gen set ....)

Thanks...
 
stickboy1375 said:
Most interlock kits are UL listed so I would say yes they are fine to install and meet the requirements of 702.6
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Its not what your thinking about.

I believe he is talking about a "Kirk Key" system.

For this application you would have 1 key, you would place a heavy duty lock on the two breakers that can not be closed at the same time.

The key is can only be removed from the lock if the breaker is locked open, so you can not close the second breaker before opening, locking, removing the key and now unlock the second breaker.


kfenn22 said:
I'm not sure why you want to use a key interlock in stead of the MTS?
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Much less expensive, just add the locks to the existing gear.


usinmentor said:
Per NEC 702.6 can key interlocks be used or are they accepted on an MCC main tie main to prevent parraleling?
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I think so, but I bet you can find out for sure at Kirk Key

There is a ton of info on that site.
 
iwire said:
Its not what your thinking about.

I believe he is talking about a "Kirk Key" system.

For this application you would have 1 key, you would place a heavy duty lock on the two breakers that can not be closed at the same time.

The key is can only be removed from the lock if the breaker is locked open, so you can not close the second breaker before opening, locking, removing the key and now unlock the second breaker.




Much less expensive, just add the locks to the existing gear.




I think so, but I bet you can find out for sure at Kirk Key

There is a ton of info on that site.
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Those are pretty interesting... I bet mine is cheaper... :grin:
 
Check with your local AHJ. I am aware of several that look for UL-1008 listing for transfer switches and will not approve Kirk Keys.
 
bphgravity said:
Check with your local AHJ. I am aware of several that look for UL-1008 listing for transfer switches and will not approve Kirk Keys.
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Then they abuse their power.

Kirk key installation is "...suitable for the intended use and designed and installed so as to prevent the inadvertent interconnection of normal and alternate sources of supply in any operation of the transfer equipment."
 
A Kirk key system is accepted as a MTS. I have them both on an Siemens Panel and Allen Bradley MCC, 5 or 6 locations, all inspected and approved.
 
If they are not allowed I can think of dozens of facillites that are in trouble, sure they can be used.

Note: Kirk Key is a brand name like megger or kleenex, they are called key interlocks and are made by several companies
 
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