Discuss Voltage drop detected, various burns in switch and connections in oven flat in the UK Electrical Forum area at ElectriciansForums.net

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eleNickBJ

Hi, I am Nicholas, I repair computers from home for a low paying hobby and repair PC power supplies with the skill of replacing bulging capacitors. I will try other repairs using the same skill of desoldering and soldering, and I am living in a single flat here in Auckland NZ.
About 9 months ago I noticed my computer began to power on slower. I would press the power supply unit switch and press the power on button the front of the PC and the PC would power on on instantly. 9 months ago I had to begin to wait for the power button to turn on the PC. This seems to be something like the PC needs enough power before it will power on. I would not have mention this happening but now that I know there is a voltage drop inside the flat I have recalled a few odd things related to the electricity in the flat.
A Vector Power ( Vector Power Company here in New Zealand ) Quality Inspector visited me free of charge and spent a couple of hours chatting and looking at all I had plugged and all the possible combinations of what I might have plugged in at any one time inside and then looked and tested outside at the power board that serves the 12 flats in this block of flats, and looked the large green junction box by the driveway that serves three blocks of flats here. He discovered a rather large dent in the base of the green power box and since then we have opened the box and seen what may be perhaps a damaged part in the base which an electrician may be inspecting in the next few days by the landlords order. The Vector man also left a voltage recorder plugged in to a mutibox in my flat and came back in 5 days and later showed me the graphs taken from the recorded results and the results showed definite voltage drops which he explained to me. If you were to look at the graphs you would see consistent ups and downs within a 20 mm range on the paper indicating the regular voltage and you would see two drops about 4 times as far from the top of the consistent ups and downs levels on the graph to the bottom of the page. I noted a few of the times through the time the voltage recorder was plugged into the multibox in the flat that the Vector man had left there, and the times I recorded coincided with the times of voltage drops on the graph so the Vector man told me. I think you may call the multibox I talking about here as a trailer box in the UK.
The landlord had an electrician talk with me and I told the electrician I thought an arching noise when I turned a switch back on after swapping out PC components and multiboxes and he opened the wall power switch and found it had been burning and replaced it with a double wall power switch so I would not be plugging two multiboxes piggy back and decided the problem may be fixed but it is not.
When I sit at my computer the screen flicks off and on again maybe 5 times each day.
I have opened all the light and wall power sockets and tightened screws but this had made no difference.
I am waiting for the electrician to come to inspect the box but feel under pressure now that the landlord has appeared reluctant to do anything unless I remind him of the burning inside the wall power socket the electrician replaced and the possibility of fire but he tries to reassures me I am in no danger. Hmm, I check statistics for effects of voltage drops online and they are not in the landlords favor.
Today I took the panels off the oven to check for any loose wires and because it behaves erratically, the elements on the stove sometimes being at full heat at LOW and giving low heat at FULL. In the rear of the oven I noticed two wires surrounded with something like pink bats for insulation, going into the rear of the stove where the oven may be, one white and one black and noticed both have evidence of burning there on the insulation. The white wire had not as much burning around it as the black wire and the area of burn around the black wire would 4 inches round and maybe 2 inches of burn around the white wire.
I wanted to post for any advice, the landlord is putting up a fight to not spend the money yet to do a proper inspection and think there is good grounds for him to do so now. Three other tenants in this block of 12 have told me they experienced power cut offs where devices would lose settings, like a video recorder and a computer powered off completely and not into standby like it usually did in the place where the person was living before he moved itno these flats about 1 week ago.
 
Very difficult to say from a distance what may be wrong.
It may be that your supply company has poor voltage control, this can happen with large commercial loads running and switching on the same supply as your house.

Alternatively there may be a problem with your connections at the incoming supply. Though I would expect that the inspector would have checked this.
Burning cables and switches does not sound too good, this may be that you are pulling large loads with your equipment but again the inspector should have noted this.

In general, someone from a distance cannot give better information than someone on the ground.
You would be best continuing to encourage your landlord to get an electrician in to check out the installation, if you can provide him with the power analysis results this would no doubt assist.
 
Hi Richard,
The Vector Power Quality Inspector service is free and he did spend some time with me up to about 2 hours and I think we covered all the possible scenarios of what and how I use the electrical devices here in this flat and I was honest with him and told him exactly what I had plugged in and when I had what plugged in and that I left things I was not using plugged in to conserve power to the bills down and he did acknowledge he was satisfied that I was not using excessive power drawing devices at any time. It is disconcerting to have the power cut every day while I use the computer.
Yesterday I checked a few power points with a little cheap gadget that holds two AAA batteries which works by holding to the power wires and illuminates if it detects voltage from between 90-1000V. The tests I did with it show, red wires show voltage and black not unless the switch is On which I think is normal.
The oven connections inside the power wall socket are both Red connected and Red connected - to the oven itself to power the oven, and there is no earth connected but there is plenty of earth wires connected inside the oven and the wall socket has the 2 Reds connected to the oven 1 Black disconnected and an earth disconnected - perhaps this is problem. Using the little Voltage tester indicates the wires behave normally as far as voltage is detected.
Also I watched inside a wall light that has not been looked at up to now except for tightening the screws inside by me, and when I turn the switch on and off and noticed a tiny spark between the switch contacts when the switch was switched on.
The Vector guy said there is nothing wrong with the power coming from the outside and that the voltage and amps at the 12 flat power board are all ok, that the voltage drop was happening inside the flat but he said he would put a voltage monitor on the 12 flat power box outside to monitor the power going to that power box for a voltage drop but I do not think he has done this yet. I am a little bothered by this because my initial conversation with Vector went fine and was the reason the Vector Power Quality Inspector came to the flat to inspect and take the Voltage recording here but now the Vector company will not discuss this with me and will now only talk with the landlord. I think he is actually the landlords agent, not the actual landlord. I think the landlord may have asked to leave me out of the picture somehow seeing the fuss he has gone to to tell me he may be better off getting another tenant, however that remains to be seen and I shall press on for a positive result. Anyhow, I shall talk with both Vector and my power company again to see what can be done to have the Vector Power Quality inspector to do what he said he would do. The landlord seems to have a "talk you out of it" habit that seems a little bothering and left with it he may just do as he sees fit than do the right thing I think.
Thanks for you reply, I think I am more looking for ideas and suggestions than electrical advice as I wait on the reluctance of the landlord agent and maybe there is other things I can do here to get to the cause of the power drop.
 
Voltage tester such as you describe will have limited use in defining a fault. There is little further that you can do to discern the problem as this would require specialised test equipment to assess the installation.
The only likely thing that causes voltage drop is a poor connection as evidenced by overheated cables.
Light switches often spark a little in normal use, often noticed when the light is not near the switch and the switch is in darkness.

Do not put yourself at risk when investigating always be aware of the deadly potential of electrical power.

For a professional approach for Vector all communication should really go through the landlord no matter how inconvenient it is for you, you can only give background information whereas the landlord can act (If he chooses).

If you are worried then put the complaint in writing to your landlord, detailing your concerns and reasons for them and request that a resolution is found within a specified time.
Thereafter if there is no response are there any advice services that could escalate your query (in the UK we would use the citizens advice bureau)?

If there is a fault within the flat then it should be able to be found be an electrician.
 
Right Richard, I agree with all you have told me. I will tell the landlord about the oven being wired to 2 Reds instead of being wired what seems to be correctly, to a Black and a Red. A neighbor suggested calling the local TV station because they have a program running that investigates this type of situation where there is no satisfactory solution found because of lack of cooperation from a landlord, if this in fact becomes a situation where the landlord does not want to resolve the problem.
 

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