Thread: RCDs in series
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John Rumm John Rumm is offline
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Default RCDs in series

Doctor Drivel wrote:

Installing a whole re-wi ring circuit vs a German/Dutch radial
circuit. The ring will be much cheaper. The prime reason it is used.


The reasons its used:

More flexibility


= cheaper


Better able to place sockets where required and in the quantity
required. Nothing to do with price.

Better fault tolerance,


= less safer.


No, it means it is less likely to pose a shock or fire risk in the
presence of the most common faults.

and less fire risk


You are having a laugh now.


Only at you. Less fire risk, since there is lower current passed through
high resistance connections, and the BS1363 accessories are certified by
stringent standard to carry full design load. Unlike many shuko style
accessories for example.

Easier to install


= cheaper.


Lower labour costs certainly. It also encourages creation of more useful
circuit layouts since they are less difficult to wire.

Less materials


= cheaper.


And lower environmental impact.

7.2kW load capacity


Unnecessary and no need for such high currents on domestic socket circuits.


Average kitchen: Washing Machine, Dish Washer, Toaster, Kettle,
Microwave etc. That alone could be pushing 11kW. Now what was the
nonsense you spouted again?

Over current and fault current protection accurately matching the
needs of the connected appliances and the circuit.


You what?


Overcurrent protection for each and every appliance selected at a level
appropriate for the appliance and not the circuit that feeds it. One ogf
the great benefits of fused plugs.

Fault protection can be provided independently of appliance protection
(and with discrimination), and can be designed so as to be appropriate
for the circuit.

Better discrimination on appliance overcurrent.


Nonsense.


If your appliance develops a fault and draws excessive current, it will
blow its plug fuse. Hence perfect discrimination. With a 16A radial and
no plug fuse you are relying on the circuit protection to operate; even
on a 500W appliance.

Oh, and you are right, it is cheaper as well. A win win win win win
win win win win situation as you would say.


yes, a win, win for cheapos


Cheaper and better in almost every respect. Good, you are learning.

The accident statistics do not support your claims either.

The Dutch safety record is half of ours.


Recorded using what criteria?


Look it up.


So you don't know. Thought so.

What about the German and French that use similar systems to the Dutch
with dramatically poorer results?


A poor culture towards safety. French and German radial using RCBOs on
each circuit are superior to our ring circuit socket crap.


I don't believe you think that for a moment. You are just trying to
argue for the sake of it.



--
Cheers,

John.

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