bluejets
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23 hours ago, Crossy said:
Multiple rods are fine under UK regs (with certain constraints) if needed to get the earth resistance down to an acceptable level, the interconnect from the CU to the array of rods being treated as the main earth point. We tend only to have rods on TT installations anyway, relying on the PEN or PE (if it's TNS) conductor.
You are of course only permitted one Main Earth Terminal (MET) where all your installation earths go.
Yes, to be fair and clear in the description, earth grids are used here as well BUT not in what would be considered "standard" installations, be it domestic, commercial or industrial.
Grids, as you point out, only have the one MEN connection but are largely confined to supply authority HV transformer yards.
There is no need or requirement to have ground resistance included in any installation inspection etc.
Bit off subject but only variation on that was the install of a lighting protection system with isolated earths at a local hospital.
Interesting to note that this was 20 years ago and checking the strike counter some weeks ago has revealed a zero strike count.
I think it was more related to the architect trying to score brownie points with design.
I have seen/installed earth grids in coal mining situations where the ground resistance is upta crap........they are restricted to mine systems which are not connected to what is normally considered the supply authority grid, usually at punch mine with generator supply but this has more to do with coal mine strict requirements regarding any above earth voltage rise (for obvious reasons).
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13 hours ago, Crossy said:
If there's a metre or so between the rods why not hook them together directly rod to rod
Would be frowned upon in many countries due to requirements for one main earth point only.
Would interfere with certain test proceedures and leave the test technician scratching their head.
A big no-no down under and probably many other places as well.
A bit like the "manual" float switch we had as temporary during a PLC fitout on the Dawson River pump station a few years ago.
Old German programmer was about to begin to re-write all his software thinking there was an error.
As for main earth cabling size, it is regulated the size of the mains.
So if copper and 16 square mm , earth would be 6 square mm.
I very much doubt any domestic install would need to be any larger than that.
After all, in the MEN system, it's a means of pegging the supply to ground potential.
The portion between the n/l and the ground rod, as long as no sub circuit earths are connected between, carries no fault current.
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18 hours ago, statman78 said:
If you are only booking air travel within Thailand check out the Thai Smile site.
They won't be around long enough.
Always used them previously but now all gone.
Reason for booking Thai Airways.
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On 11/30/2023 at 5:21 PM, carlyai said:
What's this 'arc flashing' thinggy?
You've already been told.
Be aware it does not need to be some extra large commercial/industrial site for this to happen.
Consumer mains are fed with ability to drive thousands of amps fault current.
Video link below for your convienience and education.
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Intend to book and pay local Thailand travel for early next year with Thai Airways from Australia using Paypal.
Forsee any problems there given there now exists some form of "not allowed anymore" within Thailand itself.
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21 hours ago, Crossy said:
Only by pulling the outgoing meter tails
One needs to first test for live at the consumer board and then, test for dead after turning off all loads.
Otherwise, risk of electrical burns (at best) from ionisation as one draws out the inevitable "flash" as cables are withdrawn from the meter.
Granted, at higher loads but .....who knows what is connected and runnng at the time.
Best advice, don't fug with it, get the PEA.
There is a proper proceedure to follow when re-connecting as well to ensure correct polarity regardless of how many photos one takes.
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Always the Chinese or Europeans...what about everybody else?
When they made the temporary change from 30 to 45 days, it was great.
Always find loosing the day of arrival and day of departure as part of the 30 days is a right pain.
45 days gave just that bit extra all-be-it a massive jump in travel insurance cost (non-proportional).
Notice airlines tend to do the latter as well if one makes the arrival departure dates more than the limited 30 days.
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Or....use the combos which use a separate neutral cable for the input.
Advantage is only one pole spacing.
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Been trying to look for bookings for flight times etc. for this coming February on Thai Smile web site from Aus, Suvarnabhumi to Udon Thani flight but it keeps returning as "not available".
Flights to Khon Kaen come up ok.
Dropped a line to them near on a week ago thinking maybe they have discontinued the Udon Thani flights and only received the standard reply, "we'll take a look and get back to you" (twice)
Just wondered if anyone there has had problems along the same line by locally booking. Cheers
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Yes, I'd tend to forget the WD40 also.
It's not going to help anything one bit, only cause a mess.
If the motor uses a centrifugal switch, this might require attention after all the years, however, leave well alone until the new cap is fitted.
If all ok then forget it.
You'll more than likely cause more damage than do any good trying to get to it so if it looks like it may need attention, take it to a good repair shop.
As above, forget the fan caps as they will not work.
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On 11/7/2023 at 5:31 PM, gamb00ler said:
I don't think I messed it up.
No, you have it correct.
Now as the label shows, better if you come from Asia Pacific.............
Anyhow, something to consider, given the input power is a conventional transformer (must be old unit)...consider as I have done in the past in a squeeze.
Some will complain like a stck pig, however..........I have in the past used a triac style dimmer of appropriate VA rating on transformer primary to control output.
Note that this will NOT work on smps units.
Given the output of your device is transformer / rectifier smooth to DC, perhaps no problem.
It might, given the fact that it is phase control, perhaps create noisy environment for an audio amp.
Try it at your own risk though as you would not have any control/monitoring equipment available or the knowledge to do it.
Then again you could also series up a 550W incandescent bulb.......
....shock horror.....
If it was me, I'd cut my losses and simply chuck it and buy a new unit to be honest.
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11 hours ago, gamb00ler said:
Sadly it's a North American model with no ability to select the input voltage.
That may be however, if you look on the model details sticker/plate there might be allowance for "automatic" range of input voltages.
Especially if the power supply is smps as most from the last 15 -20 years would be.
Name plate would show input as example 110-220v ac.
Failing that, get a new unit....cost and availability of a decent step down transformer would make it impractical.
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14 hours ago, carlyai said:
The problem was/is the incoming 3 phases would drop out for about 5 to 10 secs. This was happening randomly.
Do not see what that has to do with genset change over.
However, as I mentioned, a time delay is necessary, not only on loss of main supply but also re-instate.
"no problem without it you say"...wait for it...it will happen.
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On 11/1/2023 at 12:05 PM, carlyai said:
I have a 15 sec start generator command delay after the incoming power fails.
..............and on power reinstate....?????
Absolutely necessary as well.
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The best way to get correct information is at the Thai consulate in Sydney for example.
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.......................just when you think you've lived long enough to have seen it all, along comes another Gyro Gearloose.
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I'm surprised to see PEA even entertain time of use arrangement.
In Aus at least, if you want a battery system with grid feedback, you don't get a penny for what you feed back to the grid.
I expect they apply the "have your cake and eat it too" as not being acceptable.
Off topis perhaps but I see one of the WA energy suppliers wants to offer people $100 to allow them to turn off their feed back when and how they(the energy supplier) see fit.
Age old problem, energy suppliers have no way of regulating what is coming into the grid, short of turning off feed back.
Oversight, don't think so,overruled by pollies more likely.
So much for green planet, this at a time when energy is in short supply and hot summer on the horizon.
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Point is...he is a foreigner with no respect for the country he is in or the safety or otherwise of the people.
Regardless of what the local kids may or may not do on their machines.
They can deal with that in their own way.
Show him the door, don't let him back in again, and take the bike and crush it.
Let it be a lesson to others as well.
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Simply a matter of lack of preventative maintenance.
I've had motor vehicles much older than that (45 years old in fact) and never had a breakdown or "burst into flames".
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On 10/23/2023 at 11:03 AM, Crossy said:
I've used a tank-cutter in the past to "re-locate" an errant cable hole, of course it's guaranteed that something will be in the way 😞
That's always the problem...........the guts is scattered all over the interior leaving only the ends free.
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18 hours ago, Muhendis said:
"Your ovens old so no spares available. Suggest you buy a new oven"
I'm not surprised since it was installed over ten years ago.
Sounds like a cop out to me.
Usually one finds elements somewhere, not necessarily original but replacement just the same.
Manufacturers of ovens and the like very rarely make the elements themselves.
As example, not uncommon for us to do repairs/replacement elements on equipment 50 years old here in Aus.
Why bother you say.?
Look at the cost of new considering just what is in the package.
If you provide model, make, any details shown on the equipment , you may get people doing a search for you instead of just guessing and then commenting.
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On 10/20/2023 at 9:16 PM, Daffy D said:
the original fluorescent had the connecting wires come out from the middle of the fitting while the new LED all seem to come out of the end.
hehehehe...yes....we always complain about that and avoid using anything with that physical constraint.
It's alway had me wondering why they do this...when we prewire an installation, the light cable is ALWAYS taken to the centre of where the light will locate. Same on existing installs.
Only 2 options you have.....one, take it back and get one that suits........two, relocate your wiring entry point in the ceiling. (latter a right pain in the butt even when one knows what they are doing)
We opt for number one ...always.
If customer insists on using these brumby fittings, we tell them the extra cost involved ( usually double) and it's amazing how quickly these fittings are returned to whenceforth they came.
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22 hours ago, Olmate said:
Wrong again, but your not from Qld, so who cares.!
"your"...surely you mean "you're" as in you are....get an education.....
hehehehehe,,,wrong again boofhead,
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Here's the thing...It IS offerered to ALL........some may take it, some may not......... I'd be willing to bet 6to4 on that most who take it voted NO anyhow........ and the thing is.....it was as always a secret vote...... So who the hell would know if one or the other is actually entitled (term used very loosely I might add) to take the offer.
Talk about argue the point...get some brains and work it out.
It's a bulls**t move on the part of the government, and they should be hauled over the coals over it.
Next thing we'll see the same offer applied when some have a particular defeat in a regular election...........just b/s.
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The value of solar spotlight wattage compared to the old system
in The Electrical Forum
Posted
I don't really see the need to run battery operated spotlights for 12 hours at a time.
That would really be "some" battery, especially at 2000w as they tend to run up around 40 to 80v dc.
If you need to run that amount, fit mains lights, unless of course you are out in the never-never.
Other than that, probably best to go and buy a couple and try them out, navigate away from the el-cheapos naturally.
You'll find most are over-rated on what they say the performance would be.
Just don't expect to get what is written on the pack, either run time or life expectancy.
As an added note on the latter, one used to see ridiculous claims on thousands of hours life....all been removed down under here at least...never see it on the box anymore.
Always said it was crap.Maybe the LEDs would hold out but the drivers tend to shit themselves and replacing any part is not even considered anymore.