Discuss electric shower tripping in the UK Electrical Forum area at ElectriciansForums.net
1.no, i have a pension i dont need to chargeWonder if the OP is charging for this?
So its a recent install, the customer bought the kit, the installer isn't returning calls, the OCPD may be too low, we don't know if the RCD or MCB are tripping.
We do know the person fault finding doesn't have the appropriate kit.
Has it ever worked?
Did the installer provide a cert?
Wonderful!
Yes i am real^^ you read this forum regularly yet start a thread full of holes.... Are you real?
Your "friend" needs to report this chancer to trading standards, the employ a reputable spark with current practice, skills, expertise, and test kit
Funny I get 43a9.8kw appliance and its 40.833333333a.
Think the OP did his calc based on 240v.Funny I get 43a
Often manufacturers quote power used at 240V for their rated power but it should be on their instructionsFunny I get 43a
Funny I get 43a
From a design perspective @davesparks , while I appreciate technically you are correct, using 230v as the nominal voltage in calculations gives you a safer margin of error in cable selection. This is also specified at pg 316 BS7671. Now before you say well if you do that by the time you get to 30v you would end up with 9800/say, 30v = 326 amps...Design parameters dont go down from 230v. So who of you calculate say PFC with anything but 230xCmin/Zs or ccc with anything but xw/230? And I do understand if you take the resistance of the element and R =V/I and manufacturers instructions and specifications, but still if I was designing the circuit and deciding on the cable that is the way I have been taught. And I have had this "discussion" before and taken it back and written the various viewpoints calculations from both viewpoints and the tutor in question still insisted that all design calculations assume harmonised voltage, which at the end of the day only makes things safer. Let fly the dogs of war!
Yes i am real
And what holes ,why do you feel the need to put friend in inverted commas
Well it does say to post polite and professional thoughsay 'up yours'
From a design perspective @davesparks , while I appreciate technically you are correct, using 230v as the nominal voltage in calculations gives you a safer margin of error in cable selection. This is also specified at pg 316 BS7671. Now before you say well if you do that by the time you get to 30v you would end up with 9800/say, 30v = 326 amps...Design parameters dont go down from 230v. So who of you calculate say PFC with anything but 230xCmin/Zs or ccc with anything but xw/230? And I do understand if you take the resistance of the element and R =V/I and manufacturers instructions and specifications, but still if I was designing the circuit and deciding on the cable that is the way I have been taught. And I have had this "discussion" before and taken it back and written the various viewpoints calculations up on the whiteboard from both viewpoints and the tutor in question still insisted that all design calculations assume harmonised voltage, which at the end of the day only makes things safer. Let fly the dogs of war!
Bad workmanship has not changed it existed 40 years ago as it does today but installation practices have changed considerably. Now there are much refined methods of fault tracing brought into being because the old ways were not sufficiently reliable. To attempt such work now it is advisable to first become fully aware of all the parameters involved. I trained in the early 60s but would in no way say that the "things" are still the same things, the basic circuit principle is but the method of safe control has been much enhanced. We no longer look round for a metal water pipe to wrap an earth wire around.I dont have a megger, I have a fluke, Installation practices of 40 odd years ago are still practiced today,its the way they are installed ie bad workmanship that cause the problems,wiring systems have not changed since I was on the tools but certain regs have,earthing,testing,circuit discrimination I could go on but ultimately most of it is down to bad practice.
I would have had my a**e booted from my journeyman for some of the installations I have seen
Well as I said I can agree with your viewpoint without slur or demur, however there is it seems another viewpoint that does ignore your science and goes for a margin that obviously you dis-agree with. If you are truly based on scientific fact you will of course be aware that very often we get (or at least I do) 247/9 v. What do you do with that scientifically measured fact in design? And what if in the future tappings are changed to 230v? Do you inbuild future possibilities like someone adding a couple of sockets and a cooker to a ring for instance? Please bear in mind I am acting devils advocate as this subject bugs me and it is meant in a spirit of enquiry and healthy discussion.
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