Something that I often come across is a stove that has been removed from the earth leakage in domestic installations.
Many electricians believe that a stove does not need to be protected by an earth leakage and this may not be the case.
Where a stove is supplied via a stove coupler then the need for an earth leakage falls away, however, in the absence of a stove coupler then the stove must be supplied via an earth leakage.
Here is a very interesting article on this subject

http://www.eepublishers.co.za/articl...ppliances.html