!!

Not Registered?

Welcome!  Please register to view all of the new posts and forum boards - some of which are hidden to guests.  After registering and gaining 10 posts you will be able to sell and buy items on our N'porium.

If you have any problems registering, then please check your spam filter before emailing us.  Hotmail users seem to find their emails in the Junk folder.


Thanks for reading,
The NGF Staff.

Author Topic: A word of caution  (Read 1103 times)

0 Members and 1 Guest are viewing this topic.

Offline texhorse

  • Trade Count: (0)
  • Full Member
  • ***
  • N Gauge Society Number: 3953
  • Posts: 762
  • Country: gb
  • Gender: Male
    • YouTube
    • Awards
A word of caution
« on: February 05, 2018, 06:52:18 pm »
This "obvious" and "basic" thread is aimed at those like me, who even at 51 years of age is obviously still very naive where electricity is concerned.

Not much is happening on my layout this evening, as I've been blowing my electricity circuit in the house through using too many amps through the layout shed!  I was using a heater in the shed, and its use has put too much current through the house supply.  I came indoors to change the fuse for the fifth time since Christmas, thinking to myself that I really should investigate the cause.

I unplugged the plug from the wall and burnt my fingers on the pins of the plug!  When I opened it up, there's even little scorch marks in there!  Now THAT is scary.

So tomorrow, the heater is going to the tip.  Then I will replace the fuse in the plug again.  We'll see if the power cuts out again.  I am guessing it won't.

The moral of the story is to remember not to try and use too many appliances through a humble household power supply.  My layout, my shed, my house could all have had a disaster.

Andy
UK
 :dunce:
Montrose and Highland Railroad



Offline ntpntpntp

  • Trade Count: (0)
  • Full Member
  • ***
  • Posts: 1723
  • Country: gb
    • Awards
Re: A word of caution
« Reply #1 on: February 05, 2018, 07:10:47 pm »
Blimey, what rating is the heater?     A 3KW heater is about the max a plug with a 13amp fuse can handle, but that should still be well within a house ring main circuit's load capacity unless you've got a load more of them on the same circuit.
Nick.   2016 celebrating the 20th anniversary of "KŲnigshafen" exhibition layout!

Offline themadhippy

  • Trade Count: (0)
  • Full Member
  • ***
  • Posts: 430
  • Country: gb
    • Awards
Re: A word of caution
« Reply #2 on: February 05, 2018, 07:18:39 pm »
sockets are allowed to get hot
Quote
, BS1363-2:1995 requires for double socket outlets that both socket outlets have loads applied via test plugs, 1 test plug having a load of 14 amps whilst the other has a load of 6 amps, making a total load of 20 amps on the cable supplying the double socket outlet. The double socket outlet is then subjected to this loading for a minimum continuous period of 4 hours or longer until stability is reached with a maximum duration of 8 hours (stability being taken as less than 1 degC rise within 1 h). The test is passed if neither the terminals / terminations, nor the accessible external surface, increase in temperature by more than 52 degC.
However i'd throw away the plug if its showing scorching and replace with a decent mk or equivalent decent make plug.

Offline Yet_Another

  • Trade Count: (+3)
  • Full Member
  • ***
  • N Gauge Society Number: 25847
  • Posts: 713
  • Country: gb
  • Gender: Male
  • Chacun ŗ son goŻt!
    • Awards
Re: A word of caution
« Reply #3 on: February 05, 2018, 07:44:30 pm »
sockets are allowed to get hot
Quote
, BS1363-2:1995 requires for double socket outlets that both socket outlets have loads applied via test plugs, 1 test plug having a load of 14 amps whilst the other has a load of 6 amps, making a total load of 20 amps on the cable supplying the double socket outlet. The double socket outlet is then subjected to this loading for a minimum continuous period of 4 hours or longer until stability is reached with a maximum duration of 8 hours (stability being taken as less than 1 degC rise within 1 h). The test is passed if neither the terminals / terminations, nor the accessible external surface, increase in temperature by more than 52 degC.
However i'd throw away the plug if its showing scorching and replace with a decent mk or equivalent decent make plug.
That does assume the socket is wired into the ring main, though.
Tony

'...things are not done by those who sit down to count the cost of every thought and act.' - Sir Daniel Gooch of IKB

Offline themadhippy

  • Trade Count: (0)
  • Full Member
  • ***
  • Posts: 430
  • Country: gb
    • Awards
Re: A word of caution
« Reply #4 on: February 05, 2018, 07:55:59 pm »
Quote
That does assume the socket is wired into the ring main, though.
BS1363-2:1995  doesn't cover the wiring method, thats  down to BS7671

Offline texhorse

  • Trade Count: (0)
  • Full Member
  • ***
  • N Gauge Society Number: 3953
  • Posts: 762
  • Country: gb
  • Gender: Male
    • YouTube
    • Awards
Re: A word of caution
« Reply #5 on: February 05, 2018, 07:57:15 pm »
All I know is that I'll be working in the shed in Winter with a coat on in future!  Far safer.....

Andy
UK
Montrose and Highland Railroad



Offline edwin_m

  • Trade Count: (0)
  • Full Member
  • ***
  • Posts: 1181
    • Awards
Re: A word of caution
« Reply #6 on: February 05, 2018, 08:31:39 pm »
Is the plug rated at 13A?  Occasionally you find 5A rated plugs, there is nothing to stop someone fitting a 13A fuse and using it for a high-power appliance.  This would result in it getting very hot and possibly melting or starting a fire.  The current rating should be marked on the plug. 

Offline davidinyork

  • Trade Count: (0)
  • Full Member
  • ***
  • Posts: 673
  • Country: gb
    • Awards
Re: A word of caution
« Reply #7 on: February 05, 2018, 08:40:09 pm »
One of the most common issues (although it doesn't sound like it's the case here) is over-loading 4-way adapters, or even plugging one into another. The things to particularly watch out for are things with heating elements (fan heaters, kettles, etc), and things with fairly powerful motors (hoovers, drills, washing machines). These should normally be plugged into the wall socket directly, or if an extension lead is used make sure it's a heavy-duty (i.e. 13a rated) one, preferably with only one socket at the end to prevent overloading.

Also, it's advisable to check the rating of 4-way adapters - some are 10a rather than 13a, including the flex, so swapping the fuse for a 13a is a really bad idea as it could lead to the flex melting.

Offline themadhippy

  • Trade Count: (0)
  • Full Member
  • ***
  • Posts: 430
  • Country: gb
    • Awards
Re: A word of caution
« Reply #8 on: February 05, 2018, 08:49:54 pm »
Quote
Is the plug rated at 13A
All BS1363 plugs are rated for 13A,when you see a  3A label it just meens its been  fitted with a  3A fuse

Offline port perran

  • Trade Count: (0)
  • Full Member
  • ***
  • Posts: 8198
  • Country: gb
  • Gender: Male
    • Awards
Re: A word of caution
« Reply #9 on: February 05, 2018, 08:54:58 pm »
All I know is that I'll be working in the shed in Winter with a coat on in future ;)!  Far safer.....
Andy
UK
Iím with you, if itís getting hot then Iíd get rid of it.
Thereís two things I donít trust. Electricity and the wind. And you canít see either of them  ;)
It's you railway so build it as you want and run whatever you like. The only rule is - ENJOY :
My Layouts -
Port Perran:- Trepol Bay:-

Offline texhorse

  • Trade Count: (0)
  • Full Member
  • ***
  • N Gauge Society Number: 3953
  • Posts: 762
  • Country: gb
  • Gender: Male
    • YouTube
    • Awards
Re: A word of caution
« Reply #10 on: February 05, 2018, 09:11:56 pm »
I had a 5 amp fuse in the plug.  I had been assured by an expert that this would be more than adequate for what I used in the shed.  Unfortunately, he was not taking the electric heater into account.

Thankfully no harm done, and I'll be trying again in daylight, minus the heater, and checking the plug to ensure it's not getting hot.

Andy
UK
Montrose and Highland Railroad



Offline davidinyork

  • Trade Count: (0)
  • Full Member
  • ***
  • Posts: 673
  • Country: gb
    • Awards
Re: A word of caution
« Reply #11 on: February 05, 2018, 09:17:26 pm »
I had a 5 amp fuse in the plug.  I had been assured by an expert that this would be more than adequate for what I used in the shed.  Unfortunately, he was not taking the electric heater into account.

Thankfully no harm done, and I'll be trying again in daylight, minus the heater, and checking the plug to ensure it's not getting hot.

Andy
UK

A heater will normally have a 13a fuse.

Offline stevewalker

  • Trade Count: (0)
  • Full Member
  • ***
  • Posts: 159
  • Country: gb
  • Gender: Male
    • Awards
Re: A word of caution
« Reply #12 on: February 05, 2018, 10:27:00 pm »
A common reason for an overheating plug is poor contact with the socket - due to spring metal contacts weakening or corroding. It would be a very good idea to replace both the socket and the plug - the heater itself is probably fine.

Offline texhorse

  • Trade Count: (0)
  • Full Member
  • ***
  • N Gauge Society Number: 3953
  • Posts: 762
  • Country: gb
  • Gender: Male
    • YouTube
    • Awards
Re: A word of caution
« Reply #13 on: February 05, 2018, 10:29:59 pm »
It wouldn't be that Steve.  The shed was only wired to the household supply in October.  I'll rethink what you've said tomorrow after I've tried it without the heater.

Andy
UK
Montrose and Highland Railroad



Offline stevewalker

  • Trade Count: (0)
  • Full Member
  • ***
  • Posts: 159
  • Country: gb
  • Gender: Male
    • Awards
Re: A word of caution
« Reply #14 on: February 05, 2018, 10:37:40 pm »
It wouldn't be that Steve.  The shed was only wired to the household supply in October.  I'll rethink what you've said tomorrow after I've tried it without the heater.

Andy
UK

One other possibility springs to mind and is worth checking - especially with it being a new installation. A terminal screw not tightened down properly can give rise to a lot of heating and could be in either the socket or the plug.

 

Please Support Us!
May Goal: £55.00
Due Date: May 31
Total Receipts: £65.00
Above Goal: £10.00
Site Currency: GBP
118% 
May Donations


Advertise Here
anything