On 10 October 2011 01:46, Steve Blackmore <[email protected]> wrote:
> Fused plugs are a really good idea, and essential with the way we wire > using ring mains :) I think that is two correct but unconnected statements. The plug fuse is intended to protect the appliance flex (the device should be internally fused, if it matters). The idea is that a short in the appliance can't burn out the flex between the plug and appliance. The main circuit is protected in the same way by the main breaker, and the incomer is protected by the 100A fuse in the box we can't touch :-) The thing is, that the main breaker for the circuit is sized for the ring main capacity, and ring mains are bad. (oddly, this was one of the long running arguments with my ex. She seemed to think because she used to work for MK that her opinions were of more value than mine.) The problem is that whilst they can give you twice the capacity for the same wire size, there is no way to detect a wire break which halves that capacity. I do follow my dad's protocol of not actually breaking the wire at the sockets (he strips the wire in the middle, leaving an unbroken conductor) So, I agree that the plug fuse can protect a dodgy ring main, but it is in the wrong place to do that by design. If I wire a house I would wire a ring using spur-rated wire CSA, I think. Just in case. -- atp "Torque wrenches are for the obedience of fools and the guidance of wise men" ------------------------------------------------------------------------------ All the data continuously generated in your IT infrastructure contains a definitive record of customers, application performance, security threats, fraudulent activity and more. Splunk takes this data and makes sense of it. Business sense. IT sense. Common sense. http://p.sf.net/sfu/splunk-d2dcopy1 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
