Difference between revisions of "Cable Routes and Protection"
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| − | Some basic rules for the installation of cables to protect them from damage. | + | Some basic rules for the installation of cables to protect them from damage in domestic properties. |
==Cables in a wall or partition== | ==Cables in a wall or partition== | ||
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A cable concealed in a wall or partition must | A cable concealed in a wall or partition must | ||
| − | a) be at least 50mm from the surface [note 1] | + | a) be at least 50mm from the surface [note 1], '''or''' |
| − | b) have earthed armouring or an earthed metal sheath (eg SWA, a BS 8436 cable or MICC cable) | + | b) have earthed armouring or an earthed metal sheath (eg SWA, a BS 8436 cable or MICC cable), '''or''' |
| − | c) be enclosed in earthed steel conduit or trunking | + | c) be enclosed in earthed steel conduit or trunking, '''or''' |
| − | d) be provided with mechanical protection (3mm steel is deemed sufficient to meet this requirement) | + | d) be provided with mechanical protection (3mm steel is deemed sufficient to meet this requirement), '''or''' |
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e) be installed in a [[Safe_zones_for_electric_cables|safe zone]] . | e) be installed in a [[Safe_zones_for_electric_cables|safe zone]] . | ||
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Note 1 - If the wall or partition is made from or partially made from metal then the cable will require RCD protection or be installed as b), c) or d) above | Note 1 - If the wall or partition is made from or partially made from metal then the cable will require RCD protection or be installed as b), c) or d) above | ||
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| + | The 18th edition makes use of RCD protection mandatory for sockets and lighting circuits. | ||
==Cables Underground== | ==Cables Underground== | ||
Latest revision as of 16:21, 1 June 2019
Some basic rules for the installation of cables to protect them from damage in domestic properties.
Cables in a wall or partition
A cable concealed in a wall or partition must
a) be at least 50mm from the surface [note 1], or
b) have earthed armouring or an earthed metal sheath (eg SWA, a BS 8436 cable or MICC cable), or
c) be enclosed in earthed steel conduit or trunking, or
d) be provided with mechanical protection (3mm steel is deemed sufficient to meet this requirement), or
e) be installed in a safe zone .
The 17th edition also requires cables in the safe zone to have 30mA RCD protection if not installed as per a, b, c or d.
Note 1 - If the wall or partition is made from or partially made from metal then the cable will require RCD protection or be installed as b), c) or d) above
The 18th edition makes use of RCD protection mandatory for sockets and lighting circuits.