Difference between revisions of "Earthing Types"
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| Line 4: | Line 4: | ||
BS 7671 lists five types of earthing system: | BS 7671 lists five types of earthing system: | ||
| − | + | * TN-S | |
| − | + | * TN-C-S | |
| − | + | * TT | |
| − | + | * TN-C | |
| − | + | * IT | |
| − | Where those letters | + | Where those letters indicate: |
| − | + | * T = Earth (from the French word Terre) | |
| − | + | * N = Neutral | |
| − | + | * S = Separate | |
| − | + | * C = Combined | |
| − | + | * I = Isolated | |
| − | A useful | + | A useful [http://www.iee.org/Publish/WireRegs/WiringMatters/Documents/Issue16/2005_16_autumn_wiring_matters_earthing_your_questions_answered.pdf IEE document on earthing] (presumably most DIYers can ignore the section on earthing caravan pitches) |
Revision as of 10:49, 6 January 2007
Earthing Types
http://groups.google.co.uk/group/uk.d-i-y/msg/14a0b8a90fca226b
BS 7671 lists five types of earthing system:
- TN-S
- TN-C-S
- TT
- TN-C
- IT
Where those letters indicate:
- T = Earth (from the French word Terre)
- N = Neutral
- S = Separate
- C = Combined
- I = Isolated
A useful IEE document on earthing (presumably most DIYers can ignore the section on earthing caravan pitches)