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  1. R

    LED drivers not giving out correct voltage

    I've just bought a bunch of led drivers (12VDC), but they're giving out between 24-32VDC. I'm assuming their faulty. However, testing my old halogen drivers (12VAC), the voltage their outputting on a dimmer (fully on) is only 7VAC. My multimeter seems fine - just getting a bit confused as...
  2. C

    Calculating the correct cpc size

    Good evening all, Some help with following would be much appreciated. A 20 Amp rcbo in a CU supplies an adaptable box on the outside wall of a house via 2.5mm2 T & E. From the adapatable box a short lenght of SWA supplies a couple of sockets and light in a shed. My question is does the 1.5mm2...
  3. J

    Is this correct.............

    Morning just wondered if this is correct in the 1 and 2. Haven’t touched the power supply cables just changed the water pump wiring as ordered a new pump. Thanks
  4. F

    Square head bolt - correct term

    Hi lads, could anyone tell me the correct term for this type of bolt please? I'm fairly sure it starts with the letter "B". Farmer
  5. D

    dumper dynostart wiring - finding correct diode-help required please!

    Hi, I am new to the forum so firstly hello all. I have a basic understanding of auto electronics but have encountered a problem that is beyond me and need your help. I am retrofitting a dynostart (startermotor/generator) to a dumper engine that was previously hand-crank start. It is a Hitachi...
  6. R

    Finding the correct cable table

    A lot of these mock exam questions are not specific about armoured or non armoured multicore cables, flat twin or not etc, the correct table to use can be a bit of trial and error until you get the correct answer for Volt drop for example.
  7. S

    Choosing the correct ballast?

    I have a job to repair a light in office, 1200x600 grid tile fitting, I am under the impression it's the ballast that has gone, I couldn't get access to the fitting at the time but believe the lamps to T8 lamps 4x 30w (3ft) what ballast would I need for this??? Assuming it's the old magnetic...
  8. Marti

    What is the correct voltage for Tasering students? Is it in the 18th?

    Admins - you know what to do if this post is unsuitable - blame the plumbers ;) There is a point to my factious thread. Last few weeks of my level three. Mature students in class, all self funded. Folk are wondering in late, whinging, delivering assignments at the last minute et-cetra. The...
  9. D

    Guidance on correct qualifications for entry into trade

    Good evening, I am completely new to the forum, hence on this forum. I am currently a serving Fire fighter and have been interested in the potential of becoming an electrician as a career change in the long term. What I really need is the correct information on what qualifications are required...
  10. R

    How do you measure 3 Phase Supply confirming it is correct as in 400V between phases etc.

    I have my AM2 exam and the question I have is how would you confirm supply polarity? Would you do the following tests:- L1-L2 L1-L3 L2-L3 L1-N L2 - N L3-N L1-E L2- E L3-E doing this you should expect 400V reading? Finally, test Neutral to Earth and expect to be 0 volts. Would the main...
  11. A

    Cooker supply 12kw correct cable size

    Hey guys I’ve run a 6mm for a cooker, runs about 10metres. The customers has changed her mind on the cooker and gone for a 12kw range. Went back today to finish off and saw this lovely surprise. I know you have to take diversity into account. But for my peace of mind. Would 6mm 32a MCB be fine...
  12. J

    Correct cabling for flat consumer unit supplies

    I'm after some advice please guys.. I've got a job where the builder is converting a shop and flat above into 3 separate flats. There is currently just a 100a single phase supply into the shop on the ground floor. I have requested a new three phase supply to be installed, which will be located...
  13. N

    Test Rig IR Test Correct Proceedure

    Hi Guys. So I have a test coming up and wanted to get a bit of advise regarding the best way to test so I don't fail. On the rig there is a shower unit connected to a Pull cord isolator with neon. So to test it I guess I am going to have to 1. open the shower and remove the live 2. turn on...
  14. A

    Which Amperage is correct?

    I need to work out the amperage concerning a light. It is an IKEA single LED spot clip on light. The wire from the light plugs into a transformer plug. The details on the plug are as follows. PRI: 100-240V 50/60Hz 0.05A SEC: 7V 0.43A 3W I fully understand the equation and calculation...
  15. D

    Correct transformer for 12V waste water Pump.

    I recently bought a 12V Whale Gulper 220 waste water pump to remove water from a shower on the groundfloor of my house in Germany (no way to gravity empty the bath/shower.) I am after advice on if I have the correct 240V AC to 12V DC transformer. The pump is a diapragm pump and the instructions...
  16. B

    what is the correct sequence for locating faults?

    i'm a bit confused with this question, it doesn't state what kind of fault so the question is open to a broad spectrum, i'm aware the first point is speak to relevant people regarding faults but after that it could go so many ways. am i missing something here? i'm reading through the nvq3...
  17. D

    Circuit that displays correct P-N-E on a small portable distro board

    Hi All, I am designing a few small single phase power distribution boards for stage use. A 63A CeeForm inlet will supply multiple 16A CeeForm outlets Between the I/O will be a dual pole breaker > a RCD > then individual MCB's for the 16A outlets. There will also be a panel meter displaying...
  18. Edtwozeronine

    Correct symbols for physics notation

    Our tutor wants us to use what looks like a Beta symbol for Tesla's, but in our official notes from city and guilds they want us to use a capital B. Another thing that I'm having trouble with is the proportional to symbol. What does it mean mathematically speaking? Is there a button for...
  19. Doomed

    being thick

    16mm 3 core swa single phase clipped direct outside (shaded) on a 63 B type 60898 Do I really mean that the maximum length is 68m, or am I being really thick tonight? Trying to look at a way of providing more power to an outlet pillar that happens to be the furthest point from the supply cabinet...
  20. 247 handyman

    How to check if a fuse feeds a ring final or 2 radial circuit

    Hi guys. I need to check if I have a ring or 2 radial running from a fuse. I have an old wylex fuse box in which someone has put a blue 15amp fuse in a red 30amp carrier. If I disconnect the 2 cables and check for continuity of the 2 lines then the 2 neutrals will this tell me if I have a ring...

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