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Clearance requirements for Transformer from external obstructions
Applies to LV Transformers by SquareD/Schneider Electric
Transformers radiate heat when in operation, which must be dissipated
Older, non-Energy Efficient Ventilated Dry Type Transformers must be installed so that a minimum of 6 inches clearance is available between a ventilation opening and any wall or other obstructions. Energy Efficient (EE Type) Ventilated Dry Type Transformers must be installed so that a minimum of 3 inches clearance is available between a ventilation opening and any wall or other obstructions. This does not apply to bottom ventilation openings. Non-Ventilated Transformers should also be a minimum of 3 inches from any obstruction on all sides and top. Epoxy Resin Filled Transformers may be mounted directly on the wall, but require 12 inches on both sides, top and bottom. Unit Substation Style Transformers require a minimum of 12 inches around the ventilation opeinings, and local codes may exceed that. The clearance requirement is clearly marked on the nameplate of the Transformer. Should the nameplated requirements or local codes vary from the above, the greater of the two takes precedence.
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