System Types
- Thread starter wcavanagh
- Start date
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TT is when you have a live and a neutral, but no earth down the wires that supply your electricity..
you install a method of earthing at your end, usualy an earth rod, but plates or other methigs of earthing are available, all of which involve burying a large piece of metal and connecting your earth wire to it.
they do similar at their end.
it's called TT as it stands for Terra-Terra, meaning earth-earth.
you install a method of earthing at your end, usualy an earth rod, but plates or other methigs of earthing are available, all of which involve burying a large piece of metal and connecting your earth wire to it.
they do similar at their end.
it's called TT as it stands for Terra-Terra, meaning earth-earth.
The 3 most common supply types are TN-S, TN-CS and TT
TT is a system where the supply (neutral) is earthed (the first "T") at the DNOs transformer and the consumers exposed installation metalwork is all connected to another electrode (the second "T").
Any fault current in this type of installation flows back to the source via the general mass of earth.
TN-CS is a system where the supply neutral is earthed (1st "T"), there is a direct connection between the consumers installation exposed metalwork ("N"), it is combined ("C") with the neutral to the service head and then separates ("S").
Protective multiple earthing is also employed with TN-CS so the combined neutral and earth is tied to earth using electrodes or similar along its length.
TN-S is a system where the supply neutral is earthed ("T"), there is a direct connection between the consumers installation exposed metalwork ("N") and it is a separate conductor ("S").
TT is a system where the supply (neutral) is earthed (the first "T") at the DNOs transformer and the consumers exposed installation metalwork is all connected to another electrode (the second "T").
Any fault current in this type of installation flows back to the source via the general mass of earth.
TN-CS is a system where the supply neutral is earthed (1st "T"), there is a direct connection between the consumers installation exposed metalwork ("N"), it is combined ("C") with the neutral to the service head and then separates ("S").
Protective multiple earthing is also employed with TN-CS so the combined neutral and earth is tied to earth using electrodes or similar along its length.
TN-S is a system where the supply neutral is earthed ("T"), there is a direct connection between the consumers installation exposed metalwork ("N") and it is a separate conductor ("S").
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Hi,
I just found it, might be useful
Earthing systems
http://www.aboutelectricity.co.uk/articles.php?article_id=16
I just found it, might be useful
Earthing systems
http://www.aboutelectricity.co.uk/articles.php?article_id=16
Or you could just look in the Wiki on this site 
(Like the very first post on this forum asks you to do)
//www.diynot.com/wiki/electrics:earthing_supply_types_and_bonding:earthing_arrangements
(Like the very first post on this forum asks you to do)//www.diynot.com/wiki/electrics:earthing_supply_types_and_bonding:earthing_arrangements
True, but I suspect it would have told the OP all he wanted to know.
You have to ask him that
When someone is talking about systems I take it to mean the whole of the system back to and including the DNO transformer, just like the pics in the link the OP posted to from IET wiring matters - even though that document incorrectly says N means Neutral
When someone is talking about systems I take it to mean the whole of the system back to and including the DNO transformer, just like the pics in the link the OP posted to from IET wiring matters - even though that document incorrectly says N means Neutral
FHS
So if you'd seen different types mentioned, you must have seen the different terms used.
Why didn't you try searching for the different terms you'd seen mentioned?
Nice to see such friendly people here. I will stick around for more friendly advice.
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