Just been talking to electrical contractors about CU work at a small
flat. It has an 8 way and a (4 way CU for Econ 7). The condition of
the wireing is good and the installation looks to have been well done.
The cabling within the cu's is Red/Black with green/yellow sleeved
earthing. The cabling has been run very neatly within the CU's. The
contractor wants to replace them both with a new CU with mcb's - which
is nice but the work is going to cost. I would like to see the elec.
shower (only) on a separate CU with, say, RCBO., and just replace the
existing wire fuse carriers with plugin mcb's. Contractor says words
to effect that regulation not happy with that. I can see his point but
do not know if it is mandatory?
If I can find the £££ I'll have the whole lot replaced - but is it
really needed given the above? thanks.
may help you with what is required. I am a bit busy ATM to give more help so
have a read and then post back any more questions.
On Monday, 12 October 2015 18:43:46 UTC+1, ARW wrote:
Didn't see your original.
IMHO there is not much safety advantage with MCBs over rewireables. Neither
provide much protection against electric shock.
Replacing the rewireable fuses with plug in MCBs is pretty pointless and is
probably going to cost more than a packaged bundle of CU + RCDs + MCBs whi
ch are only about £50 or so (until January) as pre-Amendment 3 stock is s
Adding a separate CU for the shower will require henley blocks and tails et
c which adds to the cost and looks messy.
If the wiring is in good order throughout the flat then a CU swap should be
Except for the Economy 7. If there are 2 consumer units, it's probably
using the supplier's timer to control the heating. Moving to a single
consumer unit will require adding a timer, and possibly contactors
depending how many heaters there are.
The alternative is to replace the two consumer units with two new ones -
though ideally there should be a single main switch to turn everything
off, in this kind of installation it may not be easy to achieve.
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