winslowfam
Senior Member
- Location
- VA
Hi...in our design, we would like to place a fusible disconnect switch on a wall, at 480V. On the other side of the "working space" in front of this switch is the metal side of a large electrical cabinet, which is considered a "grounded part". According to Table 110.26(A)(1), this is a Condition 2 situation, which for 480V (277V phase-to-ground) requires 42" of space between the "exposed live parts" of the switch and the "grounded parts" of the large electrical cabinet. But, Condition 1 is allowed if the other side of this working space in front of the switch is effectively insulated. This would reduce the required space from 42" down to 36". I would like to consider applying some type of approved insulating method to the metal side of the large electrical cabinet so I can qualify for Condition 1 distances. Can this be done? The working space now isn't sufficient for installing this switch if I have to meet Condition 2 distances.
