Recent content by ElectroChem

  1. ElectroChem

    Sub Mains to a Load Centre in a Domestic Dwelling

    A couple of points 1. The RCD requirement of AS3000 is for final sub circuits, i.e. the final circuit coming out of the DB/Loadcentre. Sub-mains are not final circuits and do not require this protection. Depending on the installation conditions they may require mechanical protection, I offer no...
  2. ElectroChem

    Relay Design and Wiring

    https://lamplec.co.uk/ProductDetails/?code=INC202
  3. ElectroChem

    Relay Design and Wiring

    Maybe not the channel Spoon was thinking of but one called Technology Connections has done some features on old pinball machines. Ladder logic can absolutely represent physical relays, that's where it started. In regards to your system, I wouldn't switch the extractor through the 8-pin relay...
  4. ElectroChem

    Will an RCD offer any protection in a building with NO earth circuit?

    The simplest reason is - that's not an RCD's job. The only job an RCD has is to compare the current in and current out through it's measurement coil. If IN=OUT then all is well. If not then trip. There are absolutely devices who's job is to detect if current stops flowing. I've used them on...
  5. ElectroChem

    Will an RCD offer any protection in a building with NO earth circuit?

    If the connection has broken inside the appliance and contacted the chassis instead, then with no neutral return path there will be no current and the appliance will not work. The casing will be live and if someone touching it completes a path to earth/neutral they will get a shock, but the RCD...
  6. ElectroChem

    Current flow in neutral but no voltage ?

    Almost there but still not quite. Rather than thinking of the negative half of the sine wave as 'putting voltage on the neutral', what actually happens is that voltage is still on the active wire, but now it's negative to earth reference rather than positive. The neutral stays at 0V as it's...
  7. ElectroChem

    How can i start a different pump at each start ?

    Now that's a useful bit of kit. I was trying to design a relay flip-flop in my head.
  8. ElectroChem

    Adult apprentice wages

    20 years of data experience will get you nowhere on the path to a Cert III Electrician qualification. There is one unit in third year TAFE regarding communications cabling, nothing else that I can think of will get you RPL credit based on data and AV experience, and that's assuming you have...
  9. ElectroChem

    What is the front of a dist board called

    Don''t know if it's a universal term, but in Australia we would call the second cover inside the front door, that you can see and operate the circuit breakers through, the 'escutcheon' from the old French escuchoun.
  10. ElectroChem

    What brand are these terminals please?

    Not obvious from the photo what brand they are, and links are very brand specific. Probably you're better off getting a full double-set from the wholesaler and replacing what's there already if using links is what you want to do.
  11. ElectroChem

    Eddi currents and conduit

    IF the tails enter the CU through the same penetration there will be no net eddy current in the casing of the CU. You will get eddy currents in the metal wall of the single conduits, over a sufficient length this would represent a measurable loss of energy as heat. At 60A and several meters...
  12. ElectroChem

    UK Replacement Transformer 230V-22V 7A

    This mob looks like they will sell you one. How's your Deutsch? https://www.diwaro.de/rolladenantriebe/zubehoer-antriebe/elektrische-anschlussteile/120036.html
  13. ElectroChem

    Will an RCD offer any protection in a building with NO earth circuit?

    Australia's LV distribution is almost exclusively PME/TNCS, here called MEN (Multiple Earthed Neutral). You'll find very few TT systems here.
  14. ElectroChem

    Is 29/30 years age too late to start an sparky apprenticeship?

    I started my apprenticeship at 31, it's definitely possible.
  15. ElectroChem

    Long cable rods

    Any chance you could blow a jetline through?
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