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Discuss Wiring supply in top of Isolators RCDS and mcbs in the UK Electrical Forum area at ElectriciansForums.net
One reason I like the Schneider "Quadbreak" style of fused-switch is they isolate both sides of the fuse, so you can feed either way and don't have to worry if the load is UPS-y and leaks a lot even with the supply disconnected (i.e. potentially both sides are "live").if you get it the wrong way round the fuses remain live when the isolator is switched off.
Why do you say mcbs it will ?When it goes against the manufacturers instructions???
Is this a theoretical question, or have you come across it on a job?
Isolators, it probably doesn’t matter as it’s just a switch… but mcbs and RCDs it will
I’ve been told the exact opposite from Hager technical support, direction doesn’t matter and doesn’t effect operation at all.When I spoke to hager tech about this they said that mcbs must be fitted the correct away round as I remember it ,it was to do with the direction the arc traveled in the event of a fault or overload
When fitted to a DB/CU yes, but that is to do with the mechanical arrangement and possible results of arc gasses on the cables, etc. Not electrics as such. Also some MCB do not have identical clamps on either side, so there is a further mechanical reason for which end is on the busbar.When I spoke to hager tech about this they said that mcbs must be fitted the correct away round as I remember it ,it was to do with the direction the arc traveled in the event of a fault or overload
The MI tell you which end to connect to the busbar, and which end goes to the outgoing circuit.
I will speak to hager again and get a second opinionI’ve been told the exact opposite from Hager technical support, direction doesn’t matter and doesn’t effect operation at all.
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