The other thing that astounds me is why would someone want to be an electrician, if they find the concept of electrical circuits and current flow so confusing. It's all very well knowing the regs and passing a course, but if you simply find the concept of electrical flow around a circuit baffling, then perhaps you have chosen the wrong career? I chose electrics for my career as from a very young age I was making things with batteries, bulbs and switches and it all made perfect sense how it worked. I chose not to be a brain surgeon (just by way of example) because I know I would never have been any good at that.
This is the root of the problem....
billly the baker, or alan the accountant, or pete the postman, or clive the carpenter (add other names as appropriate)...
decides.. I know how to wire a 3 pin plug and I put those new lights up in the lounge myself...
I will do a quick course the start my own electrical trade....
But they were crap at science at school and can barely do any maths.....
The fundamental basic understanding of electrical science should be grasped to a greater degree than any understanding of the regs IMHO....
regs are open to interpretation... (and are often debated on the forum as to the best method to achieve compliance...)
BUT...
the laws of physics and electrical flow haven't changed no mater how the regs change.....
So how can anyone who has done an electrical training course of some description be unable to calculate...
I need to get power to a load..
How big is the load...
How much current will it draw...
What size of protective device will be needed (inc any startup surges)
What size cables can carry these loads....
Are there any volt drop issues....
Any special earthing arangments...
Identify if something is exposed extraneous or double insulated.....
etc..
etc..
etc..
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and lets be honest here most of these questions relate to DOMESTIC loads.....
Hardly any major complex calculations IMHO!
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There is an increasing number of people who do an alleged course and come away with no understanding of how to calculate anything...
they just keep using pre-set standard installations that they did on a 6x6 wall board for a practical exam!
so...
ALL sockets MUST be 2.5mm 32A ring...... erm.. nope!
ALL lights MUST be 1.0mm 6A loop at rose.... erm nope!
ALL cookers MUST be 6.0mm 32A with 1x cooker switch per cooker... erm nope!
ALL showers MUST be 10.0mm 40A with plastic supply pipes cross bonded... erm nope!
ALL down lights MUST be firerated... erm nope!
etc..
etc..
Or we get questions like......
I am wiring a shed with a 2way RCD protected DB,
I am putting the sockets onto a 32A ring lights on a 6A radial...
The whole lot is coming off the 20A RCD protected conservatory circuit...
There are 2x Double sockets 1x bulkhead and 1 x external floodlight over the door...
I plan on using 4.0mm 3core SWA for the 4m from the house to the shed...
Have I missed anything??
Answer.. YES: Design, Calcs, Common sense and Value for money for the customer!!!!!!
Sorry but that is a DIY level of question...
NOT the type you expect from a charging, "qualified" electrician....
Understanding the regs IS important...
BUT if you cannot grasp basic science and calculations for loads and cable sizes...
and you have got to leave site to ask on the internet if a 4.0mm cable is big enough for the greenhouse heater...
How can you be competent to work safely identifying issues as they arise that need resolving and prevent danger and injury to yourself and others...
And how can you possibly know if your test results are acceptable???
IMHO these are the basic legal obligations of competence to work alone as required by EAWR 1989 reg 16 & H&S if you are doing paid work for customers!
say a 6.0mm cooker circuit has a R1+R2 of 0.9 and a Zs of 1.12ohms..
It may appear all good for a 32A type B....
But if the circuit is only 6m long your reading imply its 85+m long..
could be dodgy joint somewhere...?
I am not convinced that some members asking questions are able to test correctly and verify if their test results actually meet regs....
Even though they may well be able to clip cable, screw trunking and wire a two way light switch!!!!
Someone was on the other day who had clearly energised a circuit without doing any dead tests!!!
as the plug in tester wasn't giving the correct lights!!!!!!!!!!
The symptoms described simply could NOT have happened if correct testing had been done.
And another person considering doing a PIR...
but asks if a kitchen should be on its own circuit?????
I can only guess they have only skim read a few regs to pass some multi-choice assessment?
If I chose to do a car mechanics course
http://www.openstudycollege.com/courses/car-maintenance.html
and got a 12v meter from maplins..
started charging £10 per hour for servicing work....
don't think many people would call me a competent mechanic and leave me unsupervised tinkering with their Jag or Range Rover???
Even though DIY car mechanical work is legal and ok....
But then we are talking about Electrical work which is all safe.. no one can be injured ..
and any fool can start their own business once the course is done...
And we must treat ALL questions as though they are from competent person who know how to design, install, test, inspect and certify everything!
Friendly and Honesty are NOT mutually exclusive things!!!!
often it is you best friends and mates who will tell you you are being a Pratt and need to sort yourself out a bit!
So if someone is clearly out of their depth....
do we comment or not??????????????????
opcorn