Installation methods of Table B.52.21 (IEC-60364-5-52)

Reference Method

Description

method a A1 – Insulated single core conductors in conduit in a thermally insulated wall
A2 – Multicore cable in conduit in a thermally insulated wall
method a B1 – Insulated conductors or single-core cables in conduit on a wooden, or masonry wall or spaced lees than 0.3 x conduit diameter from it
B2 – Multicore cable in conduit on a wooden, or masonry wall or spaced lees than 0.3 x conduit diameter from it.
method a C1- Single core or multi-core cable on a wooden wall or spaced lees than 0.3 x conduit diameter from it.
C2 – Single core or multi-core cable on unperforated tray run horizontally or vertically.
method a D1 – Multicore core cables installed in conduit or in cable ducting in the ground
D2 – Single core cables installed in conduit or in cable ducting in the ground
method c E -Multi-core cable on a wooden wall or spaced more than 0.3 x conduit diameter from it. Multi-core cable on perforated tray run horizontally or vertically.
F – Single core cable on a wooden wall or spaced more than 0.3 x conduit diameter from it. Single core cable on perforated tray run horizontally or vertically (Show more on table as below)
method ef G – Bare or insulated conductors on insulators

Method of installation F (table B.52.21 of IEC 60364-5-52) options:

Reduction factors for groups of more than one circuit of single-core cables to be applied to reference rating for one circuit of single-core cablse in free air.