Search the forum,

Discuss Can someone explain in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

"Safety from shock can sometimes be ensured by separating a system completely from others so that there is no complete circuit through which shock current could flow. It follows that the circuit must be small to ensure that earth impedance's are very high and do not offer a path for shock current. The source of supply for such a circuit could be a battery or a generating set, but is far more likely to be an isolating transformer with a secondary winding providing no more than 500 V. Such a transformer must comply with BS EN 60742, having a screen between its windings and a secondary winding which has no connection to earth.

A shaver socket is a prime example.
5.21b.gif
 
Last edited by a moderator:
Electrical separation is checked by ensuring there is no electrical link between the supply conductors and the load conductors in the appliance.

So the incoming phase has no continuity to either the load phase or the load neutral. And the same for the supply neutral.

Check by insulation resistance testing. Once verified - tick the relevant box.
 

Reply to Can someone explain in the Electrical Wiring, Theories and Regulations area at ElectriciansForums.net

OFFICIAL SPONSORS

Electrical Goods - Electrical Tools - Brand Names Electrician Courses Green Electrical Goods PCB Way Electrical Goods - Electrical Tools - Brand Names Pushfit Wire Connectors Electric Underfloor Heating Electrician Courses
These Official Forum Sponsors May Provide Discounts to Regular Forum Members - If you would like to sponsor us then CLICK HERE and post a thread with who you are, and we'll send you some stats etc
This website was designed, optimised and is hosted by untold.media Operating under the name Untold Media since 2001.
Back
Top