Is local AC isolation absolutely required?

Electron666 4 months ago

Do you absolutely need a local AC isolator or can a cable just go from a MCCB straight to the equipment being served? If no isolator is required, does the MCCB have to be 4-pole? The earthing system is TN-C-S and protective equipotential bonding is present. Thanks

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0 Chris Pearson 4 months ago

I think that more information is required.

It may depend upon what the MCCB is serving. If it is just the one piece of equipment (or group thereof) it may be sufficient to isolate at the MCCB.
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0 Chris Pearson 4 months ago

I think that more information is required.

It may depend upon what the MCCB is serving. If it is just the one piece of equipment (or group thereof) it may be sufficient to isolate at the MCCB.
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0 Electron666 4 months ago in reply to Chris Pearson

It’s a large piece of mechanical plant 1000A three-phase. Space is at a premium and standalone isolators of that size and cable bending radius would be challenging. Therefore looking to meet safety and compliance only rather than best practice in this instance. Thanks
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