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Adding circuits to Murray 200 amp 40-Space 40-Circuit Main Breaker Load Center

Adding circuits to Murray 200 amp 40-Space 40-Circuit Main Breaker Load Center

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  #1  
Old 05-16-14, 11:31 AM
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Adding circuits to Murray 200 amp 40-Space 40-Circuit Main Breaker Load Center

I have Murray 200 amp 40-Space 40-Circuit Main Breaker Load Center LC4040B1200 which currently has 4 open spaces. I need to add the following circuits to it:
- 240V 50A (double poll) - hot tub
- 240V 40A (double poll) - sauna heater
- 240V 40A (double poll) - sauna heater

These circuits would normally require 6 open spaces.

I am considering 2 options...

The option I know I can do is
- add the hot tub circuit directly into LC4040B1200
- install a 4 space main lug subpanel off the LC4040B1200 and have sauna heater run of subpannel

I am thinking that I could have also used the Murray MP240240CT2 1/2-Inch Frame Breaker with Two Double Pole 40-Amp Breakers, which allows me to do the two 240V 40A off just two spaces, hence do not need to add the subpanel.

I was trying to figure out if the LC4040B1200 allows for use of duplex (or in this case quad) MH-T breakers, but can not appear to find this information online or on the label on the load center.

Could you please advise if I can do the quad MH-T breaker or not.

Thank you so very much.
 
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  #2  
Old 05-16-14, 12:43 PM
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Based on the model number the panel cannot use tandems.

. Leave the larger loads in the main panel.
 

Last edited by pcboss; 06-04-14 at 11:31 AM. Reason: removed comment that did not apply
  #3  
Old 05-16-14, 02:12 PM
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PC, he has four empty spaces. As long as two of those spaces are adjacent he doesn't need to move any circuits in the panel, just add the sub. I agree that with those heavier loads to be added it makes sense to move some smaller loads to the sub to allow for the remaining new load to be in the service panel instead of the sub.
 
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Old 05-16-14, 03:24 PM
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Thank you much for the advice. How did you check that the load center can not use tandems by the model number?

I was trying to confirm it myself, but could not figure it out. Would love to learn how to check it.
 
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Old 05-16-14, 04:15 PM
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Would love to learn how to check it
LC4040B1200 If it took tandems it would have read something like: LC2040B1200. See Furds post below
 
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Old 05-16-14, 04:19 PM
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I have Murray 200 amp 40-Space 40-Circuit Main Breaker Load Center LC4040B1200
LC = Load Center, 4040 = forty spaces, forty circuits. Up until the last code cycle a "Lighting and Appliance Panelboard" the common service panel in a residence, was limited to a maximum of forty-two circuits. While that limit no longer stands any panel built under the old standard must adhere to the standard in place when it was constructed as long as it is in use.

If you had had a 2040 panel that would have denoted a panel with 20 spaces, all of which were suitable for tandem circuit breakers. A 2030 would denote a panel that had 20 spaces and 10 of those spaces were suitable for suitable for tandem circuit breakers.

Easy when you know how.
 
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