Strip lights go out when I turn on the saw
- Thread starter Nozzle
- Start date
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For a resistive load P=I²R=V²/R Where P is average power, V is RMS voltage and I is rms current. This is what makes RMS voltages and currents interesting and applies regardless of whether the waveform is a sinewave or not.
Of course peak voltage is important too, that is why you got "modified sinewave" inverters which switched on for only part of the cycle so that the ratio of peak voltage to rms voltage was the same as for a sinewave without all the complexity of generating a real sinewave.
Of course peak voltage is important too, that is why you got "modified sinewave" inverters which switched on for only part of the cycle so that the ratio of peak voltage to rms voltage was the same as for a sinewave without all the complexity of generating a real sinewave.
I had assumed it was obvious, but we're talking about an unsigned mean - the mean of |V| if you wish.
Kind Regards, John
Exactly. As I wrote:
As you point out, I should have added that I was talking about resistive loads.
Kind Regards, John
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Indeed, if instantaneous current is not proportional to instantaneous voltage then the RMS current times the RMS voltage will no longer be equal to the mean power.
L
lxboy
Get the electrician back, the cable supplying your workshop is undersized.
He won't be happy !
He won't be happy !
That may or may not be true - but, if you read the whole thread, you'll see that the extremely low apparent voltages seem to exist throughout the OP's house - not just in the workshop.
Kind Regards, John
L
lxboy
Well, if that's the case,the electrician should have notified the DNO.
Kind regards,
lxboy
Kind regards,
lxboy
If the electrician who wired the extension did any testing at the time, presumably (s)he would have picked up very low voltages (had they been present at the time) and, as you say, reported it to the DNO. So, either the electrician did no testing (the OP seems to have disappeared, so we can't ask him about documentation) or else the low voltage situation has arisen since then. Whatever, as you will have seen, the OP was advised to contact his DNO.
Kind Regards, John
L
lxboy
I'm still tuned in to this thread and check back every so often but it went a little off topic but I didn't want to stifle the chat people seemed to be enjoying! My electrician and I did chat about the low volts but it was/is only ever intermittent. I have reported it to UK Power Networks who of course promise to respond within 24hours... 3 days encounting!
Nozzle
Nozzle
Fair enough. I think the 'enjoyable' (for some!) off-topic bits have probably reached their logical conclusion. If the supply to your house is intermittently anything like as low in voltage as you were indicating, the DNO certainly need to look into it. I'm surprised you haven't seen them yet - in my, albeit limited, experience, DNOs seem to be very quick in such circumstances (often within hours!).
Kind Regards, John
Just out of interest do any of your neighbours experience the same problems - are you last in line from the overhead power line?
From their Website
EGS 5
–
Supply voltage (Regulation 15)
If you inform us that the electricity to your
property is outside the permitted voltage
range, we will contact you and arrange a visit
to your property within seven working days,
or, if a visit is not necessary, we will provide
a written response within five working days.
If we fail these timescales we will arrange
for you to receive £22.
EGS 5
–
Supply voltage (Regulation 15)
If you inform us that the electricity to your
property is outside the permitted voltage
range, we will contact you and arrange a visit
to your property within seven working days,
or, if a visit is not necessary, we will provide
a written response within five working days.
If we fail these timescales we will arrange
for you to receive £22.
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