Degree of protection for electrical equipment in exhaust
ventilation ducts and exhaust fans
1 The electrical equipment referred to in these
regulations should be certified "safe type" and wiring, if fitted,
and should be suitable for use in zone 1 areas as defined in IEC Publication
79 -Electrical Apparatus for Explosive Gas Atmospheres (Gas Group
II A and Temperature Class T 3).
2 Exhaust fans should be of a non-sparking type
in accordance with IACS Unified Requirement F 29, as revised.