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Does anyone know if the working clearance for a 3 phase 208 V disconnect is 36 inches or 42 inches front to back
Generally 36" but I am assuming it is condition 1-- art 110.26

Condition 1 — Exposed live parts on one side of the working space
and no live or grounded parts on the other side of the working space,
or exposed live parts on both sides of the working space that are
effectively guarded by insulating materials.
Condition 2 — Exposed live parts on one side of the working space
and grounded parts on the other side of the working space. Concrete,
brick, or tile walls shall be considered as grounded.
Condition 3 — Exposed live parts on both sides of the working
space
 
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