Table - 8 Installation Methods for Wires/Cables
Examples
Description
Reference Method to be used to determine current carrying capacity
Non-sheathed cables in conduit in a thermally insulated wall with an inner skin having a thermal conductance of not less than 10 W/m 2 K Non-sheathed cables in a conduit on a wooden or masonry wall or spaced less than 0.3 x conduit diameter from it c Single-core or multicore cables: - Fixed on (clipped direct), or spaced less than 0.3 x cable diameter from wooden or masonry wall c Single-core or multicore cables: - On perforated tray run horizontally or vertically c,h
A
B
C
E or F
>0.3 D e
>0.3 D e
c Care is needed where the cable runs vertically and ventilation is restricted. The ambient temperature at the top of the vertical section can be much higher.
h D e = the external diameter of a multicore cable: - 2.2 x the cable diameter when three single core cables are bound in trefoil, or - 3 x the cable diameter when three single core cables are laid in flat formation.
14 MKXXS001-04/01-08-2015
Made with FlippingBook Annual report