To meet enclosure’s functional requirements, correct pit/ducting channel sizing is critical to allow acceptable working area/free space. This maintains mechanical protection of cables and uninterrupted continuity (depth & direction) of cable route.
Undersized enclosures can result in damaged cables/possible hazards to utility workers and general public.
To ensure correctly sized enclosure is selected, refer to product pages in website where clear working area within pit or ducting channel is illustrated. This is free space inside enclosure (without obstruction).
Note: Most cable pits have tapered walls.
A number of factors determine size of cable enclosure. AS/NZS 3000 and AS/NZS 3084 stipulate criteria governing the number and size of conduits in these spaces.
Other specific factors include: