to the 16th Edition IEE Regulations

chapter 5

chapter 6

Special Installations
  --1. - Introduction --2. - Bath tubs and shower basins
  --3. - Swimming pools --4. - Sauna rooms
  --5. - Installation on construction sites --6. - Agricultural & horticultural
--7. - Restrictive conductive locations --8. - Earthing for function & protection
--9. - Caravan, motor homes, caravan parks 10. - Highway power & street furniture
11. - Heating appliances & installations 12. - Discharge lighting
13. - Underground & overhead wiring 14. - Outdoor installations & garden buildings
15. - Installations of machines & transformers 16. - Reduced voltage systems
17. - Marinas 18. - Medical locations
19. - Exhibitions, shows and stands

7.9.3 - Caravan park installations

These Regulations cover the arrangements for the supply of electrical energy to individual plugs on a caravan or tent park. The plots on which caravans will stand are referred to as caravan pitches.

As mentioned in {7.9.1} the supply to caravans must not be PME - this means that only TT or TN-S systems may be used. If the supply system is PME, there must be separation of the earthing systems of the pitch supplies and the incoming supply, which is usually best effected at the main distribution board with a separate earth electrode for the pitch supplies. The PME system may be used to supply permanent buildings such as toilet blocks.

Wherever possible, the supplies to the plugs should be by means of underground cables (see{7.13.3}). These cables should be installed outside the area of the caravan pitch to ensure that they are not damaged by tent pegs (which are often used in erecting caravan awnings) and ground anchors which are used to secure the caravans against the effects of high winds. If the underground cables must be below the pitches, they must be provided with additional protection. as shown in {Fig 7.22}.

If overhead supplies are used they must:
1. - be constructed with insulated, rather than bare, cables
2. - always be at least 2 m outside the area of every pitch
3. - have a mounting height of at least 3.5 m, which must be increased to 6 m where vehicle movements are possible. Since in most cases the whole of the area of a caravan site is subject to vehicle movements, most overhead systems will need to be at a minimum height of 6 m. Poles or other supports for overhead wiring must be located or protected so that they are unlikely to be damaged by vehicle movement.

There must be at least one supply socket for each pitch, the socket positioned so that it is between 0.8 m and 1.5 m above ground level, and no more than 20 m from any point in its pitch. The current rating must be at least 16 A, and the outlet must he to BS EN 60309-2, of the splash proof type to IPX4, and with the keyway at position 6h. If the expected current demand for a pitch exceeds 16 A, extra sockets of higher rating must be installed. A problem frequently arises due to the increasing use of 3 kW instantaneous water heaters in caravans because supply systems have not usually been designed to allow for such heavy loading.

Each socket must have its own individual overcurrent protection in the form of a fuse or circuit breaker; to ensure that enough current will flow to open the protective device in the event of an earth fault, it is recommended that the earth-fault loop impedance at the plug should not exceed 2 Ohms. All sockets must be protected by an RCD complying with BS 4293, BS EN 61008-1 or BS EN 61009-1 with a 30 mA rating, either individually or in groups, which must consist of no more than three sockets (see {Fig 7.12}). Since a 30 mA RCD is also required within each caravan, the device protecting the pitch socket(s) should be time delayed, to prevent the possibility of a fault in one caravan from switching off the supply to other caravans.

Fig 7.12 - RCD protection for sockets at caravan pitches



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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