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Reference Method |
Description |
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A1 - Insulated single core conductors in conduit in a thermally insulated wall A2 - Multicore cable in conduit in a thermally insulated wall |
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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. |
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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. |
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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 |
 
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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) |
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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.
