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  1. ElectroChem

    Garage lighting 1 single pole to control all 3 and 1 sensor switch to control middle one

    Yep, you need either a two-pole switch or use the single-pole to drive a two-pole relay or contactor, you can't differentially drive two sets of lights with single pole gear.
  2. ElectroChem

    Speed change

    When you say the VFD setting has not changed what do you mean exactly? Have you checked each VFD's display to record the frequency output? If they are all on a common speed control then possibly dropping out 6/12 drives could affect the voltage input to the others speeding them up slightly?
  3. ElectroChem

    Is the potential elec output worth the effort?

  4. ElectroChem

    Is the potential elec output worth the effort?

    Either Justcurious got himself a new sock puppet, or we've lost another one to the free energy gremlins.
  5. ElectroChem

    CamLock Box install - 3 Phase

    CamLock fittings are kind of overkill for your stated application, is this something the supplier has specified? Here in Australia I would use a 32A 4/5 pin plug and socket arrangement for such a supply, I'm sure there are equivalent products in the US market. Have a talk to someone who does...
  6. ElectroChem

    150mm Aluminium cable installation tips and tricks?

    Are you wedded to the concept of using aluminium? Really at that short a run and number of bends, I'd really think 95mm2 copper flexible cable would be so much easier and not all that much more expensive.
  7. ElectroChem

    how to work out what size commando plug I need.

    Are breaker curves different in the UK? I though D curve breakers were specifically for high inrush inductive loads. A D32 breaker shouldn't trip until inrush hits at least 320A, well above what a 22kw star-delta should draw on startup.
  8. ElectroChem

    , informed "I did, nt have enough privileges" to respond. How do I gain these "privileges?

    Indeed, IIRC Dan got a bit sick of every DIY post being met with a symphony of 'Get an Electrician' so now only those who request can respond in there.
  9. ElectroChem

    3 way switching relay

    I could make it work with a DPDT relay. Perhaps positioned in the roof near the light fitting in question. The only such relays I'm familiar with would definitely need to be inside an enclosure, they're not IP rated or touch protected to be loose in the wall/roof and wouldn't qualify as...
  10. ElectroChem

    how to wire a start button using a 3 phase contactor

    Seems Mega's been trawling the graveyard. I responded to another post before realising the thread was from February.
  11. ElectroChem

    Would an earth rod be beneficial

    Not quite Megawatt. In Australian domestic installations the supply from the overhead lines is 1/3 active phases and a combined Protective Earth Neutral (PEN) conductor. This PEN then becomes the installation's neutral conductor. A ground rod is driven and an earthing conductor run to the main...
  12. ElectroChem

    Single Phase 230V supply and 3ph Compressor install.

    I'll freely admit that you all have more experience with rotary converters than myself, which would be none. One of the benefits of living in Australia is a very unified electrical system, and the regulatory backing to tell customers that no, we can't always 'just make it work'. That said, I'd...
  13. ElectroChem

    Single Phase 230V supply and 3ph Compressor install.

    Yes and no. A full rotary converter that uses a single phase motor to drive a three phase generator will produce all the right angles and voltages. The cheap rotary converters use single phase with a cap to spin up a three phase motor, then tap the unused terminal for the third line. From my...
  14. ElectroChem

    Single Phase 230V supply and 3ph Compressor install.

    Using caps to make a pseudo-three phase supply is always a bodge. True single phase motors have their run winding designed to carry the full power of the motor, three phase motors are intended to carry a balanced load across the three windings. I would also not use a cheap rotary converter, as...
  15. ElectroChem

    Single Phase 230V supply and 3ph Compressor install.

    The 220V 9A Delta from the nameplate is consistent with a 2.2kW motor. When running with a VFD it has to be at least equal in rating, and not too hugely over as VFDs are not designed to reliably protect motors much smaller than their rating from overcurrent. If I had this compressor in front of...
  16. ElectroChem

    Volt drop maths

    That is actually exactly what the Australian rules say we can do for loads evenly spread along a circuit, although in ours it's expressed as taking half the total load applied at the end of the cable.
  17. ElectroChem

    Hi guys. To those in countries with TNC-S. What are your requirements regarding installation of earth rods for domestic installs?

    I think you'll find the fault path will still cause an imbalance in the RCD. Any current path except out on the active and back on the neutral tail from the RCD will be detected. The broken DSO neutral is upstream of the RCD, so should not affect it.
  18. ElectroChem

    16, 32 and 63 as a rating

    The way it was explained to me is that the series of values aids in coordination and discrimination between breakers. If you take the series 16, 20, 25, 32, 40, 50, 63, 80, 100 then from each point, if you go up TWO steps, then that value is ~1.6x where you started, and your downstream breaker...
  19. ElectroChem

    Hi guys. To those in countries with TNC-S. What are your requirements regarding installation of earth rods for domestic installs?

    The resistance to general mass of earth is generally not required to be measured, the stake just has to be pounded ~1m in. Some installations like substations have ground resistivity measurements in their construction standards. The electrode provides enough return to trip RCDs if there is a...
  20. ElectroChem

    Hi guys. To those in countries with TNC-S. What are your requirements regarding installation of earth rods for domestic installs?

    Australia uses a TNC-S variant we call Multiple Earthed Neutral (MEN). We are required to install an earth electrode at each installation, tied to Supply Neutral at the main switchboard. The resistance from the main earth bar to the earth electrode or any equipotential bonding point is...

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