NEC 110.26(A)(3) and Transformer Locations

[Shujinko]

I have proposed installation of 2 transformers with their respective disconnects in a mechanical room. There is a HVAC duct above the proposed location for the transformers that is 6'-1" above finished floor. In my eyes this is in violation of NEC 110.26(A)(3) which requires 6'-6" clear height from the floor for workspace. But a colleague brought up a good point to me. How do electricians/engineers get away with stacking transformers one above another. In some cases if the transformers are mounted on racks the transformers are one above another, and in some cases as close as 1' or 2' away from each other. Is my proposed installation of the 2 transformers (not stacked) under an HVAC duct that is 6'-1" above finished floor a violation of NEC 110.26(A)(3)? Is my colleague's point about stacked transformers a violation of NEC 110.26(A)(3)?

 

[don_resqcapt19]

Work space starts at the face of equipment and does not include the space directly above the equipment.

 

[Shujinko]

Is there an actual definition of work space in the NEC or is this definition just from the diagrams in the NEC Handbook?

 

[augie47]

Post #2 is a highly relative point and in addition, in regard to 110.26 in general, transformers are often not included as they are looked at as not "likely to require examination, adjustment, servicing, or maintenance while energized"

 

[don_resqcapt19]

Is there an actual definition of work space in the NEC or is this definition just from the diagrams in the NEC Handbook?

There is no actual definition, just the physical dimensional description found in the code rules.

My comment in post 2 is based on where the depth measurement for the workspace is measured from. That measurement point is found in 110.26(A)(1), in the last sentence.

Also I agree with the comment made by Gus in post 4...many AHJs, do not require 110.26(A) work space for transformers.