CUs are now being packaged/advertised/sold as "17th Edition [ie if the IEE Wiring regs] compliant".
Q: What is specifically "17th Edition" as opposed to 16th Edition about these CUs?
TIA
CUs are now being packaged/advertised/sold as "17th Edition [ie if the IEE Wiring regs] compliant".
Q: What is specifically "17th Edition" as opposed to 16th Edition about these CUs?
TIA
Two RCDs and a three-way split neutral bar.
what is a three-way split neutral bar.?
One for RCD1 one for RCD2 and one for the unprotected section
Toby...
One that is in three sections (which can be joined if required)
One for Neutral after main switch, for feeing neutral to each RCB and possibly for neutral to RCBOs and any non-RCBO/RCD circuits
Two for the neutrals corresponding to each RCD, e.g on page 7 of
(assuming a pre-populated split unit, other configs can be built to suit requirements)
Multiple split ways - a minimum of two RCDs usually, but can be more. Often the option of a non RCD protected section as well.
Note also that some manufacturers have taken the opportunity to "refresh" their design a little. That can mean slight incompatibilities with previous MCBs etc. (contactum for example - the new MCBs have a slight difference in positioning of some parts that means they don't sit alongside the older MCBs quite as neatly.
aha, so with a three-way split neutral bar when one of the 2 main RCDs trips it isolates both the Live and the Neutral wires going downstream if i now understand it correctly?
Yes, in a three way one, the mains feed from the meter goes to the 100A switch, then the phase (Live) output of this goes to the two RCD's and also the busbar of the non RCD'd section. The neutral from this switch connects to the other two RCD's and also to one of the three neutral strips for the non RCD'd MCBs.
Then from each RCD, the phase connects to the MCB/RCBO/etc in it's section via a busbar, and the neutral connects to the neutral strip for that RCD.
Toby...
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