Fixed Apparatus

Cables shall be sheathed with thermoplastic, thermosetting or elastomeric material. Circular, compact, extruded, bedding fillers (if any) should be non hydroscopic.

Cables manufactured from thermoplastic, thermosetting, elastomeric or mineral insulated insulating materials may be used in fixed wiring installations. Cables commonly used in the industry are of the EPR/CSP type. Mineral insulated metal sheathed (MIMS) cable is also suitable for use in hazardous areas, but its aluminium variation requires careful consideration before use.

Aluminium conductors must only be connected to suitable terminals and have a cross- sectional area (csa) not less than 16 mm2.

Cables may also be selected with consideration to their fire resistant and/or flame retardant properties, and two standards are relevant in this respect.

IEC 331 (Fire resistant): A cable manufactured in compliance with this standard will continue to operate in a fire without disruption of essential circuits and emergency circuits.

IEC 332 (Flame retardant): A cable manufactured in compliance with this standard is self-extinguishing and will not propagate the fire.