to the 16th Edition IEE Regulations
   
   
   
 
 

chapter 5
Earthing

chapter 6
Circuits

Installation control and protection
  3.1 - Introduction 3.5 - High temperature protection
  3.2 - Switching 3.6 - Overload currents
  3.3 - Isolation 3.7 - Protection from faults
3.4 - Electric shock protection

3.8 - Short circuit and overload
------- protection
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3.4.7 -  Protection for users of equipment outdoors

Because of the reduced resistance to earth which is likely for people outdoors, special requirements apply to portable equipment used by them. Experience shows that many accidents have occurred whilst people are using lawn mowers, hedge trimmers, etc. There must he a suitable plug (a weather-proof type if installed outdoors) installed in a position which will not result in the need for flexible cords of excessive length. The plug must be protected by an RCD with a rating no greater than 30 mA. Where equipment is fed from a transformer (eg the centre tapped 110 V system on construction sites), the transformer primary must be fed through a 30 mA rated RCD.

These requirements do not apply to extra-low voltage sockets installed for special purposes, such as exterior low voltage garden lighting (see {7.14.2}).

 

 

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Extracted from The Electricians Guide Fifth Edition
by John Whitfield
Published by EPA Press Click Here to order your Copy

Click here for list of abbreviations