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understanding

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  1. J

    Understanding economy 7

    Economy 7 horstmann quartz timeclocks for water heaters with dual elements, from my understanding they would require two separate supplies to work on a off peak supply and regular supply, although after looking inside one today and looking at diagrams only 1 supply is used. How is this possible?
  2. J

    Understanding breakers and RCD, un-vented cylinders

    Hi I'm a Plumber and heating engineer and a new member to your forum. I have a basic knowledge of electrics but I'm curious about how breakers and Rcd's work and whether they prevent fires. My basic understanding is the breaker trips if more power is been drawn than is safe and an RCD...
  3. A

    Understanding lighting contactor

    Hi guys, I'm new on here, I'm a level 3 apprentice, most of my experience is commercial and domestic, my boss has just taken on a large industrial job, in which we are testing and rewiring everything, first we are doing the lights, we will be fitting some lighting contacters, which will run...
  4. Loki

    Understanding manually calculating Zs

    Hi, I know that Zs = Ze +(R1+R2) & that you can look in the OSG page 125 to get maximum Zs figures (with the applied 0.8) but I wanted to check if my understanding to calculate it manually is correct? Example: 16Amp MCB type B 230v 16Amps x 5 (cos of type B) = 80Amps Ohms law formula...
  5. N

    Help Please, Circuit understanding (basic)

    Hi all, Just wondering if I could grab a hand understanding this circuit, or more specifically what each individual part is/what it does? Thanks for the help
  6. G

    Understanding Zs values

    Can anyone help me understand Zs values. In the On-Site-Guide page 60 Table 7.1 under the heading Maximum cable length, it states if Zs < 0.35 ohms for a TN-C-S system you can have a cable length of 107m In BS7671 page 58 Table 41.3 it states the Maximum Zs for a 32A CB to operate within...
  7. D

    Fixed Ring in Kitchen - Wanted to check my understanding

    Hi all, I've just been talking with a kitchen fitting company as we're currently looking at (surprise surprise) getting a new kitchen. Anyway, we are wanting to add in a dishwasher, and also replacing the existing freestanding fridge/freezer with two separate under counter ones. I've tried to...
  8. F

    Understanding and Implementing PAT - Bradford

    Hi All, Seaward Electronics are running a free half day PAT Testing workshop in Bradford on Friday morning if anyone is interesting in attending. This workshop will give those attending an introduction to the subject of PAT. The workshop will look at the legal requirements and standard...
  9. G

    Understanding Earth/Shock

    Hi I am studying to become an electrician. There are a few things I do not fully understand regarding shocks and earth and I cannot find the answers to some of my questions. Can anyone help me understand the following points regarding a standard TN system. 1) If you are in a loft or a 2nd...
  10. J

    Understanding led & lowering energy cost

    Would it be fair to say there are two types of recess lights: Halogen and LED, I am trying ti replace the Halogen recess light with an LED recess light. The electrician tells me there is no transformer attached to the Halogen lights, he said the Halogen fitting constitute 9w and 50w within...
  11. J

    Help needed for better understanding

    New to the forums site Iv recently studied and achieved my 2365 level 2 part p full and 17th edition wiring regs plus a few other parts. I have experience working as a electricians mate but not a greate deal. Long story short want to know best ways or going forward from where I'm at now. I want...
  12. Pete999

    Pete's Videos For new trainees having difficulties understanding 3 phase supplies

  13. D

    #Eureka - or - understanding Zs/Ze/R1+R2

    Not sure if I post in here or elsewhere (no access to the trainee section as yet, just waiting for details to be confirmed and access granted). But I had a eureka moment at around 2:30am this morning, woke up and completely understood the relationship between Zs, Ze, R1+R2, why we do R1+R2/4 to...
  14. GMES

    Understanding Rcds

    GMES submitted a new resource: Understanding Rcds - $ page Document on rcds work Read more about this resource...
  15. gazdkw82

    understanding maths/electrical science

    I’m at the point in my course where some of the maths isholding me back from progressing. I think it doesn’t help that I don’t know my way around ascientific calculator enough. It’s mainly how to input factors/multipliers, how tostructure some formula calculations etc… Do any of you have...
  16. gazdkw82

    Help understanding my friends garage set up

    Just having a conversation with a non electrician frown of mine who did a Feed to his garage 15 years ago. when he was explaining it I was bemused his house cu has a 63amp 400v RCD protection the garage is fed by 6mm swa into a cu with 6a mcb for lights (1.5mm t+e) and 16a mcb for sockets...
  17. gazdkw82

    Continuity understanding

    Hi, I'm abit confused with continuity testing. I have a questionin my learning books that gives me L1 to L2 & N1 to N2 & cpc1 to cpc2continuity readings and then a table with various socket test results L to Nand L to CPC. I have to identify which readings are ok and which are not ok andgive...
  18. A

    3 phase experience required

    Hi all, I'm severely lacking 3 phase experience and I know I will require this knowledge. I'm 28 and currently am a maintenance electrician (although my unfinished nvq is installations!) Have done house bashing and site work. If any of the mentors wouldn't mind me tagging along on one of your...
  19. G

    understanding legalisation environmental legalisation MC 102 on-line Exam

    Hi everyone i have this test in the next few weeks and was wondering if anyone has a mock test of this or any help would be appreciated.just dont want too fail this and have too resit it. Thanks
  20. Dan

    FSA, ECA and NSI sign Memorandum of Understanding

    The Electrical Contractors' Association (ECA) the Fire and Security Association (FSA) and the UK’s premier certification body in the security and fire sectors, the National Security Inspectorate (NSI), have signed a memorandum of understanding (MoU) Read the full news article

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