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Wiring 133/230Y System

Former Community Member
Former Community Member
Is there anything I need to consider when designing and wiring for this type of system? TN-S without the neutral distributed.
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  • 0
    Do I use 0.8 seconds instead of 0.4 for my disconnection time?

    Table 41.1 puts the Uo boundary between 0.4s and 0.8s at 120V nominal - so as your Uo is 133V nominal (and TN), then by the book you should still be using 0.4s disconnection time for small final circuits (or 5s for socket circuits over 63A or other final circuits over 32A or any rating of distribution circuits).

       - Andy.
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  • 0
    Do I use 0.8 seconds instead of 0.4 for my disconnection time?

    Table 41.1 puts the Uo boundary between 0.4s and 0.8s at 120V nominal - so as your Uo is 133V nominal (and TN), then by the book you should still be using 0.4s disconnection time for small final circuits (or 5s for socket circuits over 63A or other final circuits over 32A or any rating of distribution circuits).

       - Andy.
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