... leave a service coil - a few extra feet of cable coiled up inside the ceiling or other out-of-the-way place. However, do not exceed the 90m rule.23SLIDE 24Common cabling installation faults ... pass through or over sharp edges, holes etc.23 Installation Tips Do’s and don’ts for installation. This advice applies equally to copper and fibre-optic cable. 23SLIDE 20Don’tn … cut unlabelled ... recommended.23SLIDE 18Don … use the correct categorised 4-Pair Cable.n … label each cable before installation, mark it at both ends - more than once - using a waterproof marker. n … make the longest...