PLASTIC PATRESS BOX, METAL SOCKET PLATES


Postby ANDREW KNOX » Sat Aug 02, 2008 10:12 am

I have plastic patress boxes in stud wall; can I change the sockets with metal ones.??

Andrew
ANDREW KNOX
Rank: Labourer
Progress to next rank:
50%
Posts: 3
Joined: Sat Aug 02, 2008 10:04 am

Sponsor

Simply Build It

Postby kbrownie » Sat Aug 02, 2008 4:22 pm

ANDREW KNOX
Metal sockets fronts will fit on to plastic boxes, remember to connect the earth cable to the metal socket front earth terminal.
Regards
KB
kbrownie
Rank: Project Manager
Posts: 1993
Joined: Mon Mar 05, 2007 9:36 pm

Postby BLAKEY1963 » Sat Aug 02, 2008 4:30 pm

[quote="ANDREW KNOX"]I have plastic patress boxes in stud wall; can I change the sockets with metal ones.??

Andrew[/quote]

ANDREW KNOX

If the existing r cavity dry lining boxes , then metal
can be used , with noggins of wood for support.
If metal face plate sockets r used then it is vital
that they r properly earthed to the c.p,c of the ring main circuit

BLAKEY1963
BLAKEY1963
Rank: Site Agent
Progress to next rank:
31.6%
Posts: 658
Joined: Wed Jun 13, 2007 10:57 pm

Postby ANDREW KNOX » Sat Aug 02, 2008 6:38 pm

Thanks Blakey

Perhaps my question should have been: How do I ensure that metal socket plates are earthed correctly. Yes, they are dry lining plastic boxes set in the plasterboard so there's no earthing point in the corner like with metal boxes.

Thanks again
Andrew
ANDREW KNOX
Rank: Labourer
Progress to next rank:
50%
Posts: 3
Joined: Sat Aug 02, 2008 10:04 am

Postby ericmark » Sat Aug 02, 2008 8:21 pm

There has been many posts about earthing of back boxes and it is considered by many not to be required as if metal they would be earthed by the 3.5 mm fixing screws. So in your case so long as the earths are connected to the socket there should be no problems.
As how to ensure earthed correctly we use a meter called an earth loop impedance tester which draws heavy current Live to earth for few milliseconds and calculates with the volt drop what the total resistance of cable from supply transformer to socket and back is and is referred to as Zs.
Because these meters are expensive and can cause danger when used they are normally only used by electricians.
Assuming on a ring main measuring between both earth wires is normally a good indication. 1.4 ohm is the maximum Zs reading considering the supply to house can be 0.35 I would consider 1 ohm between both earth wires as max.
Does this answer your question?
ericmark

Postby ANDREW KNOX » Sun Aug 03, 2008 1:37 pm

Thanks everyone,

So it looks like as long as I make sure the earth cable in my ring main cable goes into the earth connector and is properly sheathed I'll be OK

AK
ANDREW KNOX
Rank: Labourer
Progress to next rank:
50%
Posts: 3
Joined: Sat Aug 02, 2008 10:04 am

Display posts from previous
Sort by
Order by



  • DIY How to Project Guides

  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!



 


  • Related Topics