Post
by kbrownie »
Tue Jan 29, 2013 9:01 pm
There are a few reason behind it, BS7671 (wiring regulations) actual state that a CPC (aka earth cable in this case) must be terminated.
From BS7671:
A circuit supplying one or more items of class II equipment, shall have a CPC run to and terminated at each point in the wiring and at each accessory.
So even though they class II double insulated, they still require a CPC, it does not and must be connected to the metal fitting, in a connection block, safely within enclosure will do.
Also there are added advantages, when it comes to testing and fault finding, and without a continuity of the CPC to the final fitting, you cannot take a Zs reading, which is also a requirment.
Then if you ever replaced this fittings and fitted lights that required the CPC to connected to it, they are there.