Earthing 12v spot lights

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Is it necesary to connect an earth wire to the metal body of domestic 12V spot lights? The transformers do not even have an earth contact.
 
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No

Have a read about SELV here:
http://www.tlc-direct.co.uk/Book/7.16.2.htm

Especially this bit:

2. - there must be no connection whatever between the live parts of the SELV system and earth or the protective system of low voltage circuits. The danger here is that the earthed metalwork of another system may rise to a high potential under fault conditions and be imported into the SELV system.
 

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