3.1.2 Electric cables for non-fixed wiring applications are to comply with an
acceptable and relevant Standard.
3.1.3 Cable insulation and sheathing materials are to be flame retardant and
non-hygroscopic and of a type that emits a minimum of smoke and toxic fumes when
overheated.
3.1.4 Cables are to meet, at least, the requirements of IEC 60332-1-2: Tests on
electric and optical fibre cables under fire conditions Part 1-2: Test for
vertical flame propagation for a single insulated wire or cable Procedure for 1 kW
pre-mixed flame, or an acceptable and relevant national standard.
3.1.5 The cables are also to be of low smoke emission type when tested in
accordance with IEC 61034: Measurement of Smoke Density of Cables Burning under
Defined Conditions.
3.1.6 Where practicable, the cables should also be of zero halogen type when
tested in accordance with IEC 60754-1: Test on Gases Evolved During Combustion of
Materials from Cables.
3.1.8 Where electric cables are required to remain operational in the event of a fire, they
are to be of a fire resistant type, easily distinguishable from other cables and
compliant with the performance requirements of the appropriate part of IEC 60331:
Tests for electric cables under fire conditions Circuit integrity, when tested
with a minimum flame application time of 90 minutes, as follows:
- IEC 60331-21: Procedures and requirements Cables of rated voltage up to
and including 0.6/1.0 kV;
- IEC 60331-23: Procedures and requirements Electric data cables;
- IEC 60331-25: Procedures and requirements Optical fiber cables; or
- IEC 60331-31: Procedures and requirements Cables of rated voltage up to
and including 0.6/1.0 kV, where the overall diameter of the cable exceeds 20
mm.
3.1.9 Cable routes within chambers are to be kept as short as possible and are to be
adequately protected where there is a risk of mechanical damage.
3.1.12 Underwater cables and lines must be designed for an external hydrostatic excess
pressure equal to 1,3 times the maximum operating depth. The pressure resistance is
to be verified by pressure-testing each made-up length after the connectors have
been fitted.
3.1.13 Electric umbilicals are to be routine tested in the manufacturer's works in the
presence of a LR Surveyor.
3.1.14 In cables for winding on drums, no mechanical forces may be transmitted by electrical
components of the cable.