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I see that there is another player in the market with products which look similar to Chint.
Swan Electrical
Swan Electrical
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Victor - Knowledge is a blessing or a curse, your current circumstances make you decide!
Solar pumping, Solar Geyser & Solar Security lighting solutions - www.microsolve.co.za -
Now that is impressive service ... a call to Chint head office this morning ... an hour later a demo unit is delivered.
Set it up on the work bench
test button = trips
voltage
L-N = 235.6 VAC
L-E = 236.0 VAC
N-E = 0.462 VAC
Trip time
0 = 16.7 mS
180 = 23.3 mS
Trip current
0 = 24 mA
180 = 21 mA
Switch "on" the socket outlet and touch the earth to the neutral on the load side = trips
Switch "off" the socket outlet and touch the earth to neutral on the load side = trips
Leakage current = displayed on the M 2417 between 2.5 mA and 25 mA during the test.
Then I realised I had the 1653 plugged in which could create a small load ... unplugged it to make sure there was no load and tested again.
As I touched the neutral terminal on the earth leakage it tripped.
What have i learnt from all this ... only that in the past 38 years as an electrician ... i have never encountered an ideal situation when touching an earth wire to a neutral terminal on the load side of the earth leakage unit.Comments are based on opinion...not always facts....that's why people use an alias.Comment
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The take here is that the ELU is behaving correctly, in that it protects the load side in an event as we have seen here where the supply side is not up to standards.
If the Earth/Neutral was according to standard, then the ELU would not trip, as there would not be a leakage current flowing from Neutral to Earth when you short it.Victor - Knowledge is a blessing or a curse, your current circumstances make you decide!
Solar pumping, Solar Geyser & Solar Security lighting solutions - www.microsolve.co.zaComment
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Correction : when I bridge the neutral and earth on the line side of the earth leakage unit (top)... then touch the earth wire on the neutral on the load side (bottom) of the earth leakage (creating an ideal situation) the leakage doesnt trip.
A question: to create the ideal situation you need to have literally zero resistance between earth and neutral ... we can see by the test results in my workshop and any other istallations i have tested ... this is not the case ... so i ask myself this question ... how do you create an ideal situation ... you join the neutral and earth on the line side of the earth leakage ( but you are not allowed to do this because it is dangerous) ... you have a transformer just before the earth leakage and join earth the neutral or as you do with a generator ?
I am interested to find out why Dereks earth leakage doesnt trip ... earthing arrangement in East London ... workshop is really close to the star point on the transformer ... short wire runs from the supply ... 24 mA is a very small amount of current (0.024 A) required to trip and earth leakage you mentioned a dedicated supply to test earth leakage units ... are you using a safety transfomer ... is this the case if you test any installtion in EAst London?
This reminds me of the old days when we had to run a seperate earth wire on the dedicated sockets ... imagine that.
Where is Andy with all his logic and formulas ?Comments are based on opinion...not always facts....that's why people use an alias.Comment
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Earth and neutral bridged in the prepaid meter which is usually in close proximity to the DB. Whole of East London. We have an ideal situation.
Peace out ... Derek.Comment
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Comments are based on opinion...not always facts....that's why people use an alias.Comment
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" Only some of the suburbs, especially the older one's, where the service cables are overhead, no earth is supplied. Only 2 wires. Live and neutral.
My house, for instance, is in one of these older areas but being a newish house compared to the rest, has an underground service cable where a seperate earth is supplied.
My test video will be uploaded this coming weekend.
Peace out ... Derek"
I need to read all the posts
Comments are based on opinion...not always facts....that's why people use an alias.Comment
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Even where a seperate earth is supplied, it is still bridged with the neutral in the prepaid meter. Mine included.
Supply Authority will NOT install the prepaid meter if that special copper link that is supplied with the meter bases is not in place between the earth and neutral on the meter base.
Peace out ... Derek.
You will notice that even although there is an incoming earth, if you look closely you will see a bare copper bridge between the earth and neutral.
That's how it's done here.Last edited by Derlyn; 21-Oct-20, 09:07 AM.Comment
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Your loop impedance test results must be low?
I have been thinking ... this might not be a bad idea considering the rate at which earth wires are being removed from the overhead lines around here ... creating a huge problem with loop impedance tests.Comments are based on opinion...not always facts....that's why people use an alias.Comment
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Ian, my brother. Anything above 0,5 Ohms and we know there's something not right. I mean we only checking the earth loop impedance up to the meter.
Fortunately we have a good relationship with the guys at Revenue in the Municipality.
Take a photo of the sealed meter, make a call and request permission to break seals and pull the meter in order to carry out inspection on base.
Inspection done, one call and a technician from Revenue is there within the hour to re seal.
My brother, that is one department that's on the ball here in our valley.
Peace out .. Derek.Comment
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