7.5 Cautionary display for underground wiring
[Basic requirements]
If it is necessary to bury cables underground, the correct method to carry out the work shall be stated in the work instructions in order to prevent hazards such as the emission of smoke, ignition and fire owing to corrosion or rust of the cables.
[Design standards]
The installation work instructions shall indicate that:
a) The cables shall be run through protective pipes or conduits.
b) No cables shall be connected or spliced underground.
[Criteria]
Compliance is determined on the basis of the installation work instructions.