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Cable table which column to use

Baldyhugh
Hi


Im currently doing a bit of circuit design and am a bit rusty. I’m planning to use a 3 core swa for a single phase circuit. Do I choose the 2core cable single phase column in The regs book current capacity tables even though im using a three core cable or the three or four core cable column? Some of the tables show a little asterix denoting ‘with or without a protective conductor’ which would help in my instance, however table 4d4a doesn’t show this. 

Thanks in advance

Peter
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    I'd say 4D2A normally. 4E2A might be appropriate if the cable has thermosetting (rather than thermoplastic) insulation AND you're happy to run it at 90 degrees - but most terminals preclude that of course.


    4E4A is for 90 degree armoured - and would seem an "interesting"  choice for an unarmoured cable like HiTuff, but I suppose might be justified if the manufacturer was confident of a higher rating without increasing conductor temperature (perhaps they're trying to sell into the SWA market and don't want to tell customers that they might occasionally have to go up a size).


       - Andy.
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  • 0
    I'd say 4D2A normally. 4E2A might be appropriate if the cable has thermosetting (rather than thermoplastic) insulation AND you're happy to run it at 90 degrees - but most terminals preclude that of course.


    4E4A is for 90 degree armoured - and would seem an "interesting"  choice for an unarmoured cable like HiTuff, but I suppose might be justified if the manufacturer was confident of a higher rating without increasing conductor temperature (perhaps they're trying to sell into the SWA market and don't want to tell customers that they might occasionally have to go up a size).


       - Andy.
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