By Brian Scaddan
This new version brings this functional publication into line with the sixteenth variation of the IEE Wiring rules which used to be released in may possibly 1991. Brian Scaddan is the writer of "Wiring platforms and Fault discovering for deploy Electricians".
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Extra info for 16th edition IEE wiring regulations : explained and illustrated
48 Protection Overload An overcurrent occurring in a circuit which is electrically sound. Residual current device An electromechanical switching device or association of devices intended to cause the opening of the contacts when the residual current attains a given value under specified conditions. Short-circuit current An overcurrent resulting from a fault of negligible impedance between live conductors having a difference of potential under normal operating conditions. Skilled person A person with technical knowledge or sufficient experience to enable him to avoid the dangers which electricity may create.
There may be a case for the bonding of patio doors, which could be considered earthy with rain running from the lower portion to the earth. However, once again the part most likely to be touched is the sliding section, to which it is not possible to bond. In any case there would need to be another simultaneously accessible part to warrant considering any bonding. 44 Earthing 4 Q: What about bonding in bathrooms? A: Bathrooms are particularly hazardous areas with regard to shock risk, as body resistance is drastically reduced when wet.
Nuisance tripping Certain appliances such as cookers, water heaters and freezers tend to have, by the nature of their construction and use, some leakage currents to earth. These are quite normal, but could cause the operation of an RCD protecting an entire installation. This can be overcome by using split-load consumer units, where socket outlet circuits are protected by a 30 mA RCD, leaving all other circuits controlled by a normal mains switch. Better still, especially in TT systems, is the use of a 100 mA RCD for protecting circuits other than socket outlets.
16th edition IEE wiring regulations : explained and illustrated by Brian Scaddan