- Joined
- 11 Jan 2004
- Messages
- 43,990
- Reaction score
- 2,894
- Country
Same with plaster. Pink oop North, grey down South.
It was always grey round here, finish, bonding now its pinkSame with plaster. Pink oop North, grey down South.
Which bit of the country are you in?It was always grey round here, finish, bonding now its pink
Is there any evidence that occasional relatively short-lived high currents less than the cables alleged 'CC@ (or even a little over that) have any significant impact on cable life?Well yes i do not disagree with that,in essence, however even loading throughout the ring should be attempted in order to avoid overloading or large amounts of load bias even if not overloaded would be expected to enhance life of cables to nearly forever.
You are, of course, only able to make such comments because you are talking about rings. The cable does not know whether it is part of a ring or radial circuit but, in the latter case, one cannot usefully 'spread the load around the circuit' (current-wise) and nor is there any significance of "the middle third" (or any other portion) of a radial circuit - with a radial circuit which has multirole connected loads, the current carried by the cable just progressively increases as one gets closer to the origin of the circuit, with the circuit's entire total load current going through the cable near to the origin.Simple thoughts of a quick in yer head nature are usually all that are required or even back of a fag packet if you like. There is no need to make great reams of calculations to acheive this aim. Two simple rules cover its (providing that total ring overload has been dealt with) 1/ even spread around the ring and/or 2/ most loads around the middle one third of total ring length and then you should have a ring that lasts a long time and no particular portion aging much more rapidly than the remainder.
As I said, designers cannot 'design properly' when one is talking about a sockets circuit, the use of which is beyond the designer's control. As you say, they can only guess about likely usage.Yup. The aim is to make current time broadly similar tgroughout, that could go towards not overloading any part of the ring , keeping ring length (or radial length as well) to a reasonable minimum will also help with volt drop and fault clearing (at least earth faults with fuses anyways) .. .... It was not unknown around here , back in the day, for folk to use 3kw fan heaters and again some used tgree or even four on one ring, some folk had tge trusty old immersion heater attached to the ring in those days, it was by no means uncommon.
CumbriaWhich bit of the country are you in?
So do we, take the motorhome & EBikes, avoiding school holidays, stay at a site in Borrowdale set in the woods, on the last weekend of the season, hardly any one there, red squirrels, owls hooting in the nightCumbria. Often go and see the lake, nice run out for us then a stay overnight or sometimes two nights
I`m not disagreeing with you John, well not much anyway. Yes the loads we work to have safety factors worked into them anyway.If one does stick with that caveat, then it is exceedingly unlikely that the CCC of any of the (Method C 2.5mm²) cable would ever be exceeded, since that would require that the 'full' 32A worth of loads be applied very close to one end of the ring - which I would suggest is an extremely unlikely situation.
As I said, designers cannot 'design properly' when one is talking about a sockets circuit, the use of which is beyond the designer's control. As you say, they can only guess about likely usage.
Dr. AR Dykes said:Engineering is the art of modeling materials we do not wholly understand into shapes we cannot precisely analyze so as to withstand forces we cannot properly assess in such a way that the public has no reason to suspect the extent of our ignorance.
If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Are you a trade or supplier? You can create your listing free at DIYnot Local