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Bonding both sides of an swa cable

MrJack96
Is it necessary to bond both sides of an armoured cable if it’s not being used as a CPC and if you bond it at the supply side of an electrical motor starter panel is there anything in the regs where it should be bonded too or can it just be bolted to the chassis stud using a 6mm fly lead off the gland. 


thanks for your help in advance guys.
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  • Former Community Member
    0 Former Community Member
    It should be earthed at least at the source end, as it is clearly an exposed conductive part.


    Most calculation methodologies and much tabulated cable data assumes that the armour is reliably connected to earth at both ends.


    If the switchgear, MCC's etc is metalclad, then you achieve this simply by the use of the correct cable gland, banjo and bolt (as you describe with a connection from the "chassis stud"). Whether you chose to connect the banjo to the switchgear earth bar in addition to your core CPC is up to you, but good practice says that you should as either the core, or the armour or both may need to carry fault current . It ultimately depends on how the gland plate is fitted (or is integral to the metal enclosure ?)


    Regards


    OMS
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  • Former Community Member
    0 Former Community Member
    It should be earthed at least at the source end, as it is clearly an exposed conductive part.


    Most calculation methodologies and much tabulated cable data assumes that the armour is reliably connected to earth at both ends.


    If the switchgear, MCC's etc is metalclad, then you achieve this simply by the use of the correct cable gland, banjo and bolt (as you describe with a connection from the "chassis stud"). Whether you chose to connect the banjo to the switchgear earth bar in addition to your core CPC is up to you, but good practice says that you should as either the core, or the armour or both may need to carry fault current . It ultimately depends on how the gland plate is fitted (or is integral to the metal enclosure ?)


    Regards


    OMS
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