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  1. ElectroChem

    I Think I May Have Found Free Renewable Energy

    You're starting to annoy me. Either you're deliberately being obtuse or simply not listening to our answers. The generator IS NOT driving the fan. The generator is just one link in a chain of energy conversions that goes back to the power station burning coal or splitting uranium. Every step...
  2. ElectroChem

    I Think I May Have Found Free Renewable Energy

    The 200W motor can turn an unloaded generator, but as soon as you put >200W of load on the output, the motor will overload, slow down and stall. You will never get 3000W out of the system for more than 1-2 seconds as the inertia of the rotor is used up. The power rating of a motor reflects how...
  3. ElectroChem

    I Think I May Have Found Free Renewable Energy

    No, the generator literally can't make more power than the motor input. That's your fundamental misunderstanding. A 500MW generator being driven by a 20W motor can generate exactly 20W minus losses, that's it. The nameplate capacity of a generator is not some magic code for free energy, it's...
  4. ElectroChem

    I Think I May Have Found Free Renewable Energy

    Ask and Ye shall receive. This system you propose is functionally identical to all your previous ideas involving generators and flywheels, just with the extra step of water in pipes. Say you run your pump off the mains, and in doing so put 1000kWh of movement energy into the water. That's your...
  5. ElectroChem

    Furse Surge Protection

    *Clicked the link thinking you'd said 'False Surge Protection' hoping for a smackdown of some Chinese rubbish quote-unquote "surge protector". I'll show myself out.
  6. ElectroChem

    Trainee Info For Mentors Benefit

    I'll throw my bit in, even though you may need to kick me out of here shortly :) I'm 33, doing an adult apprenticeship in Australia as a career change. I finished the coursework component at the end of last year, now I'm working towards having my time served and hopefully signed off by this time...
  7. ElectroChem

    Jason's Story (Please read)

    Update on this case, following a coroner's inquest the responsible electrician has been charged with manslaughter.
  8. ElectroChem

    Industral cable ties

    The individual cores of the cable will still repel under fault conditions. I've seen vids of a large multicore basically exploding on a test rig.
  9. ElectroChem

    Measuring earth leakage

    Yes I saw the price, I'm working on the assumption that you wouldn't be junking your distro after each event. A larger one-time cost for greater convenience down the road.
  10. ElectroChem

    Measuring earth leakage

    A single CT around all conductors would give the imbalance current, but I'm not aware of any panel gauges that could work on such a low current value. I did manage to find THIS earth leakage relay with a digital display, perhaps that would suit better? It's Australian but an equivalent...
  11. ElectroChem

    Gas soldering iron for heatshrink?

    I've got one much like that mini-torch/soldering iron, but it has an attachment for the front that absorbs the flame to give a hot air gun. You should be able to find something similar in England surely? Tradeflame Heat & Solder, Blowtorch Kits & Accessories, Butane Kits, Micro soldering torch kit
  12. ElectroChem

    Calculating minimun sized CPC

    Not a zero impedance loop, the supply impedance was taken into account, but it was assumed as a worst case scenario that the return path added no resistance.
  13. ElectroChem

    Calculating minimun sized CPC

    Not sure if it's done the same way where you are, but in our college for calculating PSCC we were told to assume a zero impedance earth return.
  14. ElectroChem

    Trainees, Show Us Your Installs

    Oh I certainly do, please don't worry on that score. You raise good points and some of them did come up in the design process. There are no set regs for colour coding of panel wiring here, it's often left up to us or the client may have a site spec. One common one I see is orange/grey for 24V...
  15. ElectroChem

    Trainees, Show Us Your Installs

    I seem to recall a similar conversation the last time I posted a panel. I do actually have a colour scheme for this one: Red/White/Blue/Black - 415V 3P+N Purple/Grey - +24VDV/0V (earthed) Orange - VSD I/O wiring White/Black - analog wiring from CO controller to terminals (shielded 2 pair cable...
  16. ElectroChem

    Trainees, Show Us Your Installs

    Design about 3 hours, plus a bit going over options with the boss. Building the panel about 20 hours. Apologies for the rough drawing, this was my modified-as-I-go working notes.
  17. ElectroChem

    Trainees, Show Us Your Installs

    Basic operation is controlling speed of an exhaust fan based on CO levels in the carpark. Also controls a vent fan in the garbage skip storage room, with external fire alarm trigger to change fan behaviour. I'll track down and post my controls schematic, that may help.
  18. ElectroChem

    Trainees, Show Us Your Installs

    Been a while with no new posts, time to add one I think. Just wrapping up this panel now, exhaust setup for the carpark of a block of flats. Master had me design and layout from scope of works, once the building is ready I'll be top man on site for the install, looking forward to it.
  19. ElectroChem

    3 phase motor Question

    Forgive a stupid question, but isn't peak production going to be when you have the most particle generation and hence the greatest need for extraction? If anything, you want your vent running full pelt for a while after end-of-shift then spinning down overnight.
  20. ElectroChem

    australian electrical assessment

    Don't hold your breath on that. I'm a third year apprentice, my boss would expect me to be able to draw a DOL with remote start stop in minutes and wire it not much slower. Best start brushing up on your control circuit theory.
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