Notes:

• Cat A system is one where the wiring system is inherently suitable for installation below ground and no further mechanical protection is required.
• Cat B system is one where the wiring system is suitable for installation below ground only with additional mechanical protection provided for the cable or cable enclosure.

Below Ground Clearances

• Wiring systems installed below ground must:
• Maintain separation from other services in accordance with Table 3.7 of AS3000 (summarised in below ground separation distances).
• Use HD PVC conduits for all underground cable runs.

Services Crossover 

• Separation distances outlined in below ground and above ground or as per manufactures specifications must be maintained where services cross over.

Above Ground Clearances 

• Wiring systems installed above ground must maintain a separation from other services in accordance with above ground separation distances.
• Electrical equipment, including switches, socket-outlets and other accessories, in accordance with Clause 4.2.2.6 of AS 3000 must be:
• Arranged to provide a separation of not less than 300mm horizontally
• Positioned 600 mm vertically from any opening or recess in the opposite side of a wall, ceiling or floor that is required to be fire-rated.

Conduits - In Concrete

• Conduits which are completely concrete encased must:
• Be installed with adequate separation and be bunched in accordance with the Structural and Electrical Engineers’ requirements.
• Have a minimum clearance of 1.5 x times the size of aggregate.
• Be steel or HDPE in high strength concrete (anything over 40MPa). Note: avoid casting in conduits in high strength concrete if possible.

Fixing and Supports

• Fixings and cable support systems must be installed as per manufacturer’s specification.

Pits

• Electrical pits to be labelled, free of debris and sitting on a gravel bed of no less than 300mm and / or provided within drainage to the stormwater system.