Cable Enclosure Theory
 - Choosing Cable Enclosures
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The following steps take you through the key decisions in selecting the correct pit/ surface ducting and cover combination.

Cable runs often traverse through different urban environments. Specific consideration needs to be given to each individual enclosure.

For an introduction to cable enclosures, click here.

choosing the right cable enclosure

choose the right size

The correct pit/surface ducting channel size must be selected - each of the following aspects of cable management need to be reviewed to choose the right width, length and depth of enclosure.

Important factors include:

Minimum depth coverage for cables

Purpose of pit

Is segregation of cables required?

Will the pit be used for storage?

Other criteria

Choosing the right location Location
a. Traffic & Loading

Traffic – where enclosures are located in vehicular or non vehicular areas and where the possibility of non-deliberate traffic in non-vehicular areas exists.

Loading – load standards are a tool to enable an objective comparison of products by providing an independent measurement scale.

b. Durability

To ensure a long life, enclosures, according to their intended location, must be selected on the basis of their materials and installed correctly.

Important to note:

Pits positioned along a cable route can typically cause various types of  load scenarios.

Each pit location should be individually considered

Click here to see typical uses of cable enclosures.

choosing the right safety & security

Safety & Security
Cable enclosures must not only facilitate overpassing foot or vehicular traffic, but also protect humans and livestock against physical contact with potentially live parts through accidental contact, unauthorised access and injury from on-site manual handling.

Additionally, the contents of an enclosure must be adequately protected from the ingress of water and foreign matter.

Important factors include:

Level of security required

Minimising the chance of damaged cables making lids live

Earthing of pits

Slip resistance

Ingress of foreign matter

Manual handling

Water ingress

choosing site & user requirements Site & User Requirements
a. Installation & Maintenance
The correct method of installation is critical for an enclosure’s long term performance and structural integrity. Consideration must be given to ease of authorised access to the enclosure.
b. Aesthetics & Identification

Should the cover be discreet and match the pavement surface?

Do contents need to be distinguished from other services?

Are there other unique requirements?

Important factors include:


Conduit entry



Visual continuity

Pit marking


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