16th Edition (reference only) – NOW superseded by the 17th Edition IEE Regulations.

chapter 5

chapter 6

Data cabling and networks
  9.1 - What is data cabling and why do
------- we need it?
9.4 - System design and categories

  9.2 - What are digital systems? 9.5 - Installing data cabling
  9.3 - Copper or glass fibre? 9.6 - Useful information

9.5 - Installing data cabling

Twisted-pair and optical fibre cables must be tested before installation in accordance with the manufacturer’s specification. Great care must be taken to avoid electrostatic discharge damage, which can result from the charge held by the operator, which may be due, for example, to walking on certain types of carpet which include man-made fibres. The chassis of the equipment on which work is intended must be securely earthed, and an earthed wrist strap worn by the operator.

The following lists of good and bad practices should be followed.

Good practice – things to DO
Locate the main cross-connect near the centre of the area concerned so that cable distances are limited.
Always use more cable than you need. Leave plenty of slack.
Each horizontal cable should be terminated on a dedicated telecommunications outlet.
Ensure that cables are at a sufficient distance from equipment that may generate heat or electromagnetic interference.
Maintain the twist of all cable pairs right up to the point of termination.
Label both ends of each cable.
Use connecting hardware that is compatible with the installed cable.
Tie and dress cables neatly with a minimum bending radius of four times the cable diameter.
Test each part of the network as it is installed.
All metallic conduit or trunking must be earthed.

Bad practice – things to AVOID
Do not allow cable lengths to exceed the allowable maximum.
Do not create multiple appearances of the same cable at several distribution points (bridge taps).
Do not leave wire pairs untwisted.
Do not over-tighten cable ties, do not use staples and do not bend cables sharply.
Do not use connecting hardware that is of a lower category than the cable being used.
Do not join cables to increase their length – replace with a longer cable.
Do not secure cables so that there is stress on the terminations.
Limit cable bundles to 50 cables to avoid crushing the lower cables.
Prevent kinks occurring in cables during pulling.
Do not use undue strain when cable pulling.
When cable routes pass through walls, the hole should be suitably sleeved and cables should enter and leave the hole at 90o to the wall.
Make sure that the network is thoroughly tested on completion.


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Extracted from The Electricians Guide Fifth Edition
by John Whitfield

Published by EPA Press Click Here to order your Copy.

Click here for list of abbreviations