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Discussion Starter · #1 ·
Any experience with inspection for spacing between 2 MCCs? How to interpret CEC 2-308? what is the spacing between 2 MCC's facing each other? Is it measured between the 2 bus bars, between 2 denergized buckets or the buckets totally drawn out?
I got reference from an inspector that it is between the buckets partially but would like a second reference.
If the buckets are 40 cm de-energized, not totally drawn out. would the space required in front be 1.4m?
 

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Good question. We know we need a minimum of 1.0 meters, but now we have to define what they mean by connected, test, or fully disconnected position. Honestly, if it were me I would ensure there is 1.0 meter plus the depth required to fully draw out a bucket.
 

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2-308
The space referred to in Subrule (1) shall be in addition to the space required for the operation of drawout-type equipment in either the connected, test, or fully disconnected position and shall be sufficient for the opening of enclosure doors and hinged panels to at least 90°.

Also don't get hung up on the 1 meter clearance. Table 56 changes that based on voltages.
 

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Discussion Starter · #6 ·
Thanks for all inputs. I am looking for actual inspection results. In our case it is a an existing prefab e-house where we need to install 600V MCC's front to front, so the spacing considering draw out equipment is critical. The situation is that draw out equipment (starter buckets) become de-energized when extracted only 2-4 inches, but would take a full 1' to take it out of the mcc. I got feedback from a CSA inspector at manufacturing facility and he approves to consider only 2-4 inches to have the bucket de-energized. I am asking if this interpretation is ok or there might be another inspector that has a different interpretation. The conservative interpretation of full extraction doesn't allow installation of another MCC in the e-house, that is why I need to check if we can compromise on a more optimized interpretation.
 

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Thanks for all inputs. I am looking for actual inspection results. In our case it is a an existing prefab e-house where we need to install 600V MCC's front to front, so the spacing considering draw out equipment is critical. The situation is that draw out equipment (starter buckets) become de-energized when extracted only 2-4 inches, but would take a full 1' to take it out of the mcc. I got feedback from a CSA inspector at manufacturing facility and he approves to consider only 2-4 inches to have the bucket de-energized. I am asking if this interpretation is ok or there might be another inspector that has a different interpretation. The conservative interpretation of full extraction doesn't allow installation of another MCC in the e-house, that is why I need to check if we can compromise on a more optimized interpretation.
Refer to the bottom image in the pic on post 4.

It's really self explanatory.
 

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Thanks for all inputs. I am looking for actual inspection results. In our case it is a an existing prefab e-house where we need to install 600V MCC's front to front, so the spacing considering draw out equipment is critical. The situation is that draw out equipment (starter buckets) become de-energized when extracted only 2-4 inches, but would take a full 1' to take it out of the mcc. I got feedback from a CSA inspector at manufacturing facility and he approves to consider only 2-4 inches to have the bucket de-energized. I am asking if this interpretation is ok or there might be another inspector that has a different interpretation. The conservative interpretation of full extraction doesn't allow installation of another MCC in the e-house, that is why I need to check if we can compromise on a more optimized interpretation.
No actual inspection results for you, but reading that rule again, it specifically says the 'disconnected position'.
I'd run it by your inspector, but I think he may ask for the 1M, plus the 40cm X2 ... 1.8M total (because you could have both buckets across from each other disconnected)
 
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