Cable Reference Installation Methods

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Introduction

The IEC 60364 standard defines a number of installation methods which represent the various installation conditions. By the following icons, they are divided into groups and defined by the letters A to G which determine how to read the table of the current-carrying capacities in conductors.

Method A

Method A.jpg
  • A1 - Insulated single core conductors in conduit in a thermally insulated wall
  • A2 - Multicore cable in conduit in a thermally insulated wall

This method also applies to single core or multicore cables installed directly in a thermally insulated wall (use methods A1 and A2 respectively), conductors installed in mouldings, architraves and window frames.


Method B

Method B.jpg
  • B1 - Insulated single core conductors in conduit on a wall
  • B2 - Multicore cable in conduit on a wall

This method applies when a conduit is installed inside a wall, against a wall or spaced less than 0.3 x D (overall diameter of the cable) from the wall. Method B also applies for cables installed in trunking / cable duct against a wall or suspended from a wall and cables installed in building cavities.


Method C

Method C.jpg
  • C - Single core or multi-core cable on a wooden wall

This method also applies to cables fixed directly to walls or ceilings, suspended from ceilings, installed on unperforated cable trays (run horizontally or vertically) and installed directly in a masonry wall (with thermal resistivity less than 2 K.m/W).


Method D

Method D.jpg
  • D1 - Multicore or single core cables installed in conduit buried in the ground
  • D2 - Multicore or single core cables buried directly in the ground


Method E

Method E.jpg
  • E - Multicore cable in free-air

This method applies to cables installed on cable ladder, perforated cable tray or cleats provided that the cable is spaced more than 0.3 x D (overall diameter of the cable) from the wall. Note that cables installed on unperforated cable trays are classified under Method C.


Method F

Method F.jpg
  • F - Single core cables touching in free-air

This method applies to cables installed on cable ladder, perforated cable tray or cleats provided that the cable is spaced more than 0.3 x D (overall diameter of the cable) from the wall. Note that cables installed on unperforated cable trays are classified under Method C.


Method G

Method G.jpg
  • G - Single-core cables laid flat and spaced in free-air

This method applies to cables installed on cable ladder, perforated cable tray or cleats provided that the cable is spaced more than 0.3 x D (overall diameter of the cable) from the wall and with at least 1 x D spacings between cables. Note that cables installed on unperforated cable trays are classified under Method C. This method also applies to cables installed in air supported by insulators.


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