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

jim wrote:

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?

Two RCDs and a three-way split neutral bar.

what is a three-way split neutral bar.?

George (dicegeorge) wrote:
what is a three-way split neutral bar.?

One for RCD1 one for RCD2 and one for the unprotected section

Toby...

George (dicegeorge) wrote:

what is a three-way split neutral bar.?

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

www.denmans.co.uk/downloads_public/17th_mk.pdf

(assuming a pre-populated split unit, other configs can be built to suit
requirements)

jim wrote:
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?

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.


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

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?
--

[george]

~ ~


"Andy Burns" wrote in message
et...
George (dicegeorge) wrote:

what is a three-way split neutral bar.?

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

www.denmans.co.uk/downloads_public/17th_mk.pdf

(assuming a pre-populated split unit, other configs can be built to suit
requirements)

George (dicegeorge) wrote:
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?

"Andy Burns" wrote in message
et...
George (dicegeorge) wrote:

what is a three-way split neutral bar.?

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

www.denmans.co.uk/downloads_public/17th_mk.pdf

(assuming a pre-populated split unit, other configs can be built to
suit requirements)

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...