burnt 3 pin plug.
I was moving a washing machibe in a friends flat last night, and I
noticed that the 3 pin plug has signs of burning around the live and neutral pins - not too serious - just enough to discolour the plastic and turn it brown. What could cause this to happen? Thanks, Mark. |
burnt 3 pin plug.
On Tue, 9 Sep 2008 03:21:27 -0700 (PDT), wrote:
I was moving a washing machibe in a friends flat last night, and I noticed that the 3 pin plug has signs of burning around the live and neutral pins - not too serious - just enough to discolour the plastic and turn it brown. What could cause this to happen? Thanks, Mark. Cheapo socket ! Andy C |
burnt 3 pin plug.
"Andy Cap" wrote in message ... On Tue, 9 Sep 2008 03:21:27 -0700 (PDT), wrote: I was moving a washing machibe in a friends flat last night, and I noticed that the 3 pin plug has signs of burning around the live and neutral pins - not too serious - just enough to discolour the plastic and turn it brown. What could cause this to happen? Thanks, Mark. Cheapo socket ! Andy C agreed - always use the best sockets in the kitchen or utility room where heavy load appliances will be connected. However, it could be loose connections. |
burnt 3 pin plug.
On 9 Sep, 11:25, Andy Cap wrote:
On Tue, 9 Sep 2008 03:21:27 -0700 (PDT), wrote: I was moving a washing machibe in a friends flat last night, and I noticed that the 3 pin plug has signs of burning around the live and neutral pins - not too serious - just enough to discolour the plastic and turn it brown. What could cause this to happen? Thanks, Mark. Cheapo socket ! Andy C Why would a cheap socket cause this to happen? Thanks, Mark. |
burnt 3 pin plug.
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burnt 3 pin plug.
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burnt 3 pin plug.
wrote in message
... On 9 Sep, 11:25, Andy Cap wrote: On Tue, 9 Sep 2008 03:21:27 -0700 (PDT), wrote: I was moving a washing machibe in a friends flat last night, and I noticed that the 3 pin plug has signs of burning around the live and neutral pins - not too serious - just enough to discolour the plastic and turn it brown. What could cause this to happen? Thanks, Mark. Cheapo socket ! Andy C Why would a cheap socket cause this to happen? The metal wipers in the socket holes do not touch the pin over a big enough area or firmly enough to give the minimum contact resistance or cut through surface dirt/oxidation. This leads to heat and more oxidation, leading to more heat. This can happen over time with a decent socket - it never hurts to unplug and plug back in every now and then (once or twice a year) to remake the contact. Also loose wires inside a rewirable plug (not usual on a washing machine now) can cause the same heating problem - check screw tightness too if the plug is rewirable. -- Bob Mannix (anti-spam is as easy as 1-2-3 - not) Thanks, Mark. |
burnt 3 pin plug.
On 9 Sep, 11:36, The Natural Philosopher wrote:
wrote: I was moving a washing machibe in a friends flat last night, and I noticed that the 3 pin plug has signs of burning around the live and neutral pins - not too serious - just enough to discolour the plastic and turn it brown. What could cause this to happen? Thanks, Mark. Corrosion in the socket and on the plug. Causes arcing RF interference and heat. Really replace both plug AND socket. It's not *likely* to catch fire, but its happened.. Thanks! |
burnt 3 pin plug.
On 9 Sep, 11:42, "Bob Mannix" wrote:
wrote in message ... On 9 Sep, 11:25, Andy Cap wrote: On Tue, 9 Sep 2008 03:21:27 -0700 (PDT), wrote: I was moving a washing machibe in a friends flat last night, and I noticed that the 3 pin plug has signs of burning around the live and neutral pins - not too serious - just enough to discolour the plastic and turn it brown. What could cause this to happen? Thanks, Mark. Cheapo socket ! Andy C Why would a cheap socket cause this to happen? The metal wipers in the socket holes do not touch the pin over a big enough area or firmly enough to give the minimum contact resistance or cut through surface dirt/oxidation. This leads to heat and more oxidation, leading to more heat. This can happen over time with a decent socket - it never hurts to unplug and plug back in every now and then (once or twice a year) to remake the contact. Also loose wires inside a rewirable plug (not usual on a washing machine now) can cause the same heating problem - check screw tightness too if the plug is rewirable. -- Bob Mannix (anti-spam is as easy as 1-2-3 - not) Thanks, Mark.- Hide quoted text - - Show quoted text -- Hide quoted text - - Show quoted text - So there couldn't be a more sinister wirig problem at the root of this? Thanks, Mark. |
burnt 3 pin plug.
wrote in message ... On 9 Sep, 11:36, The Natural Philosopher wrote: wrote: I was moving a washing machibe in a friends flat last night, and I noticed that the 3 pin plug has signs of burning around the live and neutral pins - not too serious - just enough to discolour the plastic and turn it brown. What could cause this to happen? Thanks, Mark. Corrosion in the socket and on the plug. Causes arcing RF interference and heat. Really replace both plug AND socket. It's not *likely* to catch fire, but its happened.. Thanks! As an aside - MK was derived from "Multi - Kontact". Their patent was to ensure better contact in the days of round pins - when many makers were using a fairly simple round hole, MK introduced spring loaded sectors to make better contact. Incidentally, the type of plastic does not discolour easily - so I think if has been seriously hot. The wires in the socket may be damaged. Take care! |
burnt 3 pin plug.
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burnt 3 pin plug.
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burnt 3 pin plug.
wrote in message ... I was moving a washing machibe in a friends flat last night, and I noticed that the 3 pin plug has signs of burning around the live and neutral pins - not too serious - just enough to discolour the plastic and turn it brown. What could cause this to happen? Thanks, Mark. Tired plug fuse |
burnt 3 pin plug.
wrote in message ... I was moving a washing machibe in a friends flat last night, and I noticed that the 3 pin plug has signs of burning around the live and neutral pins - not too serious - just enough to discolour the plastic and turn it brown. What could cause this to happen? Not using MK sockets, not pushing it in properly, hanging weights on the flex, getting it covered in corrosive chemicals, ... I would go for a cr@p socket or not pushing it in well. |
burnt 3 pin plug.
On 9 Sep, 12:23, "dennis@home" wrote:
wrote in message ... I was moving a washing machibe in a friends flat last night, and I noticed that the 3 pin plug has signs of burning around the live and neutral pins - not too serious - just enough to discolour the plastic and turn it brown. What could cause this to happen? Not using MK sockets, not pushing it in properly, hanging weights on the flex, getting it covered in corrosive chemicals, .. I would go for a cr@p socket or not pushing it in well. Thanks guys - I shall advise they replace plug and socket! Thanks, Mark. |
burnt 3 pin plug.
In article
, wrote: I was moving a washing machibe in a friends flat last night, and I noticed that the 3 pin plug has signs of burning around the live and neutral pins - not too serious - just enough to discolour the plastic and turn it brown. What could cause this to happen? Loose connections within the plug. Loose connections to the fuse. Poor quality socket. Grease etc got onto the socket or plug pins. Plus a few others I can't remember. -- *Upon the advice of my attorney, my shirt bears no message at this time Dave Plowman London SW To e-mail, change noise into sound. |
burnt 3 pin plug.
In article ,
dennis@home wrote: Not using MK sockets, MK *may* have been superior to some other makes many many years ago but not anymore. -- *I took an IQ test and the results were negative. Dave Plowman London SW To e-mail, change noise into sound. |
burnt 3 pin plug.
In article ,
Andy Wade wrote: So there couldn't be a more sinister wirig problem at the root of this? Loose terminal screws and/or fuse clips in the _plug_ is the most common cause of this. If discolouration is evident I'd replace both plug and socket as a precaution. Ensure that all terminal screws are really tight, that the end-caps of the plug fuse are clean and that the fuse is gripped firmly by the clips in the plug. Also ensure that the plug's cord grip is correctly used and firmly clamps the sheath of the flex. Of course unless it's pretty old it has probably got a factory fitted moulded on plug. I dunno how these are connected to the flex - crimped? -- *Avoid clichés like the plague. (They're old hat.) * Dave Plowman London SW To e-mail, change noise into sound. |
burnt 3 pin plug.
"Dave Plowman (News)" wrote in message ... In article , dennis@home wrote: Not using MK sockets, MK *may* have been superior to some other makes many many years ago but not anymore. I don't think they are inferior to any ATM. |
burnt 3 pin plug.
"Dave Plowman (News)" wrote in message ... In article , dennis@home wrote: Not using MK sockets, MK *may* have been superior to some other makes many many years ago but not anymore. -- *I took an IQ test and the results were negative. Dave Plowman London SW To e-mail, change noise into sound. I accept that - standards have improved - unless you buy absolute tat. (Avoid Pound Shops and Sunday markets!) All good brands will meet the proper requirements. |
burnt 3 pin plug.
wrote I was moving a washing machibe in a friends flat last night, and I noticed that the 3 pin plug has signs of burning around the live and neutral pins - not too serious - just enough to discolour the plastic and turn it brown. What could cause this to happen? Thanks, Mark. Don't think this has been covered elsewhere....... If the plug is rewirable, strongly recommend that you cut the flex back approx 50mm and totally remake all wiring into the plug. The amount of heat required to cause the blackening is likely also to have "baked" the connecting wire and its insulation. If you remove the plug and try to flex the individual conductors you will probably find that all the insulation will simply flake off and the wire ends may well break easily. Also, if you replace the socket, then check out the ends of the mains wiring also (I had a similar fault leading to the issues noted above). Phil |
burnt 3 pin plug.
The Natural Philosopher wrote:
Thinking about it, a smear of silicone grease on the plug new plug that you are going to install with the new socket should help a lot.. Is it conductive then? If so, I never knew that. Dave |
burnt 3 pin plug.
Dave wrote:
The Natural Philosopher wrote: Thinking about it, a smear of silicone grease on the plug new plug that you are going to install with the new socket should help a lot.. Is it conductive then? If so, I never knew that. Dave Funny thing memory. You have just nudged back into my head that silicone is a major problem for domestic electrical equipment. Seems excessive use of Pledge (and similar) ends up with silicone spreading everywhere - and effectively insulating components. One drop can spread out to cover a square metre? So it causes failure of many televisions in there wood-effect cases that were proudly polished. However, my memory might be playing tricks. Or the original info. mght have been duff. I await comments by others who *know* the answers. -- Rod Hypothyroidism is a seriously debilitating condition with an insidious onset. Although common it frequently goes undiagnosed. www.thyromind.info www.thyroiduk.org www.altsupportthyroid.org |
burnt 3 pin plug.
Dave wrote:
The Natural Philosopher wrote: Thinking about it, a smear of silicone grease on the plug new plug that you are going to install with the new socket should help a lot.. Is it conductive then? If so, I never knew that. No. it isn't5, but it doesn't break down and turn to carbon. So it makes a decent covering against corrosion. Dave |
burnt 3 pin plug.
Bob Mannix wrote:
wrote in message ... On 9 Sep, 11:25, Andy Cap wrote: On Tue, 9 Sep 2008 03:21:27 -0700 (PDT), wrote: I was moving a washing machibe in a friends flat last night, and I noticed that the 3 pin plug has signs of burning around the live and neutral pins - not too serious - just enough to discolour the plastic and turn it brown. What could cause this to happen? Thanks, Mark. Cheapo socket ! Andy C Why would a cheap socket cause this to happen? The metal wipers in the socket holes do not touch the pin over a big enough area or firmly enough to give the minimum contact resistance or cut through surface dirt/oxidation. This leads to heat and more oxidation, leading to more heat. This can happen over time with a decent socket - it never hurts to unplug and plug back in every now and then (once or twice a year) to remake the contact. Also loose wires inside a rewirable plug (not usual on a washing machine now) can cause the same heating problem - check screw tightness too if the plug is rewirable. Are they not all made to a British Standard spec? I would assume that laid down minimum contact areas? -- Dave - The Medway Handyman www.medwayhandyman.co.uk |
burnt 3 pin plug.
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burnt 3 pin plug.
On Tue, 09 Sep 2008 18:04:17 GMT, "The Medway Handyman"
wrote: The metal wipers in the socket holes do not touch the pin over a big enough area or firmly enough to give the minimum contact resistance or cut through surface dirt/oxidation. This leads to heat and more oxidation, leading to more heat. This can happen over time with a decent socket - it never hurts to unplug and plug back in every now and then (once or twice a year) to remake the contact. Also loose wires inside a rewirable plug (not usual on a washing machine now) can cause the same heating problem - check screw tightness too if the plug is rewirable. Are they not all made to a British Standard spec? I would assume that laid down minimum contact areas? It may or may not. As regards the sockets the actual area of contact is governed by the profile of the contacts after they've been pressed into the required shape and concealed within the plastic assy. Of course the quality of the metal contact material is also significant. Plenty sold on market stalls and in pound shops are counterfeit. Sometimes stuff is claimed to be made to a BS spec (so that's all right) but in fact has never been tested by an independant test house, you've only *Their* word for it that it complies. Sometimes stuff is type tested and passed but then the production methods are not sufficient to ensure consistency of the product over the years of production. For instance a colleague once went to China to install a Swiss metal casting machine and found the "factory" had four walls and a roof but just an earth floor. His precision casting machine weighed 3 tons. A famous local manufacturer of electric motors moved production to Poland and found the rate of warranty failures and customer complaints suddenly went through the roof. They sent somebody over and found the "factory" was unheated and the operatives were assembling motors in the Polish winter wearing overcoats and gloves. Imagine how much of a mess a back street sweat shop in Bangalore could make of a 13A socket. Derek |
burnt 3 pin plug.
wrote in message ... I was moving a washing machibe in a friends flat last night, and I noticed that the 3 pin plug has signs of burning around the live and neutral pins - not too serious - just enough to discolour the plastic and turn it brown. What could cause this to happen? Thanks, Mark. I find the 'modern' plugs with the 'half plastic' pins seem to get a lot hotter when used on higher power items like fan heaters and other things with elements in, like your washing machine. I suppose it isn't possible to get the old, all brass items any more though. If you don't have RCD protection, you may find that you have an earth leak in the machine itself if the element is on the way out (RCD would trip out when you switched on the machine if there was such a leak.) S |
burnt 3 pin plug.
The Natural Philosopher wrote:
Dave wrote: The Natural Philosopher wrote: Thinking about it, a smear of silicone grease on the plug new plug that you are going to install with the new socket should help a lot.. Is it conductive then? If so, I never knew that. No. it isn't5, but it doesn't break down and turn to carbon. So it makes a decent covering against corrosion. Noted, thanks. Dave |
burnt 3 pin plug.
Derek wrote:
Imagine how much of a mess a back street sweat shop in Bangalore could make of a 13A socket. I've seen 13A 3 pin plugs supplied with computer equipment that were barely any bigger than the old triangular round-pin plugs. They had no space for a fuse, and fingers could very easily touch the pins while being plugged in! They basically looked like this http://www.lakewoodconferences.com/d...uth_Africa.jpg But the pins were square to fit UK sockets... |
burnt 3 pin plug.
"chunkyoldcortina" wrote in message ... Derek wrote: Imagine how much of a mess a back street sweat shop in Bangalore could make of a 13A socket. I've seen 13A 3 pin plugs supplied with computer equipment that were barely any bigger than the old triangular round-pin plugs. They had no space for a fuse, and fingers could very easily touch the pins while being plugged in! They basically looked like this http://www.lakewoodconferences.com/d...uth_Africa.jpg But the pins were square to fit UK sockets... Report them to trading standards and they will be done for supplying illegal equipment. They can't even supply one without the insulated pins these days (I suppose that technically they could just fit a six+ inch wide shield all around the plug). |
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