Clear Space Rules and Associated Equipment

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hans90

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Pismo Beach California
Many years ago I remember a discussion regarding allowing a Transformer Secondary disconnect to be installed above and back of a transformer on th ewall, since it was common to the Transformer installation,
and the clear space rule did not require spacing the disconnect off of the wall, flush to the front of the transformer.
I thought that it was allowable to mount on the wall above the transformer.
I cannot find the wording in the section 110. 26.

Am I mistaken on this rule, I thought it was a code change several cycles ago.

Any help would be appreciated.

Steven Dittmann P.E.
 
If above you need to do something like this. The maximum encroachment permitted on the working space is 6".

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Clear Space Rules

Clear Space Rules

Yes I was thinking that at the worst case, but I remember something about being able to mount to the wall, without the off set. Some code discussion years ago.

Thanks
 
I've managed to live thru a lot of Code cycles and I don't recall that ever being allowed by the NEC.
I've seen it, and seen it "slip by", but don't ever recall it being Code allowed.
 
Some may read the maximum encroachment space of 6" as extending from the wall for a surface mounted disconnect. ( rather than from the front of the dedicated space, when configured as in the photo.)
Unless the top panel of the transformer is removable or has penetrations, the working space would start at the front of the transformer.
The dedicated electrical space would be directly above the transformer, and could contain arbitrary electrical equipment.
 
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If the switch is mounted to the wall then the transformer cannot be more than 6" past the front of the switch due to the working space requirement for the switch.
 
infinity said:
If the switch is mounted to the wall then the transformer cannot be more than 6" past the front of the switch due to the working space requirement for the switch.
Click to expand...
Assuming that the switch needs working space. Some hold the opinion that a non fused disconnect does not require working space.
 
GoldDigger said:
Assuming that the switch needs working space. Some hold the opinion that a non fused disconnect does not require working space.
Click to expand...

Since the OP mentioned that the swich is on the secondary side I would make the assumption that it has an OCPD for protection of the secondary conductors.
 
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