Renowned for having good fire resistance and also a smaller cross section for a given current carrying capacity than other cable types

• aka pyro (from makers name Pyrotenax)
• Copper tube sheath with magnesium oxide insulation
• Fireproof
• Rigid
• Occasionally seen in domestic premises, mainly in blocks of flats
• Widely used for fire alarm systems in commerce
• Unterminated ends prone to absorbing moisture from the air
• Special cable terminations required
• Ideal for flammability risk areas, eg traversing a thatched roof.
• Picture shows 1.5 mm² MICC with outer diameter 7.2 mm

MICC is one of the toughest of cables because:

• its metal cased
• it handles very high temperatures
• it still works even if you hammer it quite flat – the conductors and mineral insulation all compress in the same proportion, and you have to go a long way before it shorts out