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Posted by Tom P on January 28, 2012, 12:41 am
On 01/22/2012 10:09 PM, Rick wrote:

Outside of the UK, Eire, a few ex colonies and strangely the UAE nobody
seems to use the ring vircuit system with fused plugs.

Posted by Rick on January 28, 2012, 12:10 pm

I suppose that in the days before consumer units with RCDs were commonplace,
it wasn't unknown for people to replace a 15A fuse in the fuse box with the
equivalent of a 6 inch nail, which on a 30A ring circuit may not have been
such a good idea.
Therefore the inclusion of a 3, 5 or 13A cartridge fuse inside the plug was
probably a sensible idea, although I have seen people wrap wire and even
tinfoil around a blown plug fuse, which goes to prove that no matter how
well you design something it's almost impossible to make it totally idiot

However, safety standards on the majority modern appliances are now so high
that there is now little, if any, need for fused plugs.

Posted by Morris Dovey on January 22, 2012, 3:28 pm
 On 1/22/12 8:57 AM, Rick wrote:

Generally as Mikek described, with heavier circuits for kitchen
appliances (and electric clothes dryers, where used).

Bathrooms are wired like other rooms, and there is usually a single
central (frequently natural gas) water heater that serves both kitchen
and bath.

Morris Dovey

Posted by amdx on January 22, 2012, 3:46 pm
 On 1/22/2012 8:57 AM, Rick wrote:

   Power enters our homes as 240v with a center tap (called neutral).
In our circuit breaker box the two hot lines (L1 and L2) have 240V
between them, this is sent out to dryers, ovens, water heaters, and
HVAC. Then for the the 120v lines L1 and neutral (plus a ground wire)
are distributed to lights and outlets, The same is done with L2 and
neutral. There is an attempt to keep the load on each leg somewhat
equal. These 120v lines generally have a 20amp circuit breaker and use
12 gauge wire, some very old homes have 15 amp breakers/fuses and 14
gauge wire.

Posted by Jim Wilkins on January 22, 2012, 4:12 pm

In the US portable consumer appliances are generally limited to 15A at 120V.
The wall outlets are rated at 15A or 20A, with only a few per circuit
breaker and separate circuits for overhead lighting.

Electric stoves and clothes dryers have dedicated 240V circuits with
appropriate plugs and breakers like 30A. This house had an electric
fireplace in the basement with a 240V 30A plug, which I use to run a large
air compressor. It's a standard low-cost tract house from 1970 and has a
200A service with 40 circuit breaker positions plus separately metered
electric hot water.

Hobbyist-sized arc welders and plasma cutters can be either hard-wired (as
are water heaters and large air conditioners) or they can use a 50A 240V

When we need occasional three phase power for machine tools we use static or
rotary converters or electronic Variable Frequency Drives running off 240V.


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