Difference between revisions of "Earthing Types"
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http://groups.google.co.uk/group/uk.d-i-y/msg/14a0b8a90fca226b | http://groups.google.co.uk/group/uk.d-i-y/msg/14a0b8a90fca226b | ||
− | A useful link to an IEE | + | BS 7671 lists five types of earthing system: |
− | [http://www.iee.org/Publish/WireRegs/WiringMatters/Documents/Issue16/2005_16_autumn_wiring_matters_earthing_your_questions_answered.pdf] | + | TN-S |
+ | TN-C-S | ||
+ | TT | ||
+ | TN-C | ||
+ | IT | ||
+ | |||
+ | Where those letters each indicate: | ||
+ | T = Earth (from the French word Terre) | ||
+ | N = Neutral | ||
+ | S = Separate | ||
+ | C = Combined | ||
+ | I = Isolated | ||
+ | |||
+ | A useful link to an IEE PDF on the subject (presumably most DIYers can ignore the section on earthing caravan pitches) [http://www.iee.org/Publish/WireRegs/WiringMatters/Documents/Issue16/2005_16_autumn_wiring_matters_earthing_your_questions_answered.pdf] |
Revision as of 10:00, 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 each indicate:
T = Earth (from the French word Terre) N = Neutral S = Separate C = Combined I = Isolated
A useful link to an IEE PDF on the subject (presumably most DIYers can ignore the section on earthing caravan pitches) [1]