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Appendices 85
Cabling installation, maintenance and safety tips
Prior to installing or maintaining your cables, review the following list of important
safety
considerations:
• Keep all CAT 5 runs to a maximum of 10 meters each.
• Maintain the twists of the pairs all the way to the point of termination, or no more than one-half
inch untwisted. Do not skin off more than one inch of jacket while terminating.
• If bending the cable is necessary, make it gradual with no bend sharper than a one inch radius.
Allowing the cable to be sharply bent or kinked can permanently damage the cable’s interior.
• Dress the cables neatly with cable ties, using low to moderate pressure. Do not over
tighten
ties.
• Cross-connect cables where necessary, using rated punch blocks, patch panels and
components. Do not splice or bridge cables at any point.
• Keep CAT 5 cable as far away as possible from potential sources of EMI, such as electrical
cables, transformers and light fixtures. Do not tie cables to electrical conduits or lay cables on
electrical fixtures.
• Always test every installed segment with a cable tester. “Toning” alone is not an
acceptable
test.
• Always install jacks so as to prevent dust and other contaminants from settling on the contacts.
The contacts of the jack should face up on the flush mounted plates, or left/right/down on
surface mount boxes.
• Always leave extra slack on the cables, neatly coiled in the ceiling or nearest concealed
location. Leave at least five feet at the work outlet side and 10 feet at the patch panel side.
• Choose either 568A or 568B wiring standard before beginning. Wire all jacks and patch panels
for the same wiring scheme. Do not mix 568A and 568B wiring in the same installation.
• Always obey all local and national fire and building codes. Be sure to firestop all cables that
penetrate a firewall. Use plenum rated cable where it is required.
7 white/brown white/brown
8 brown brown
Table D.1: UTP Wiring Standards (Continued)
Pin EIA/TIA 568A EIA/TIA 568B