Caravan installations

In caravan parks, the distribution system should comply with the relevant parts of the Electricity Supply Regulations 1988 as well as with the Division Two requirements. Regulation 608-13-05 could perhaps have been improved by indicating that for TN-S supplies the supply company will normally provide an earthing facility, but for TN-C-S (PME) and TT supplies an earth electrode has to be installed by the occupier. The section requires the supply socket outlets to have sensitive RCD protection complying with subsection 412-06, as for the caravan installations, so that in the event of an earth fault in a caravan both RCDs should operate. To avoid more than the faulty installation supply being disconnected, grouping should be avoided and an RCD provided for each socket outlet. 

Consumer installations which supply LPG to more than one user (e.g. metered estates, holiday home parks, caravan sites) require the gas supplier (i.e. the site owner/operator, not the LPG supplier) to obtain prior consent from the Office of Gas Supply (Ofgas) and, for the necessary pipework installation, from the Department of Energy, Pipelines Inspectorate. 

The TO 6 type got two separate gas jet pumps, one for each measuring range and an el. magn valve. A range selector does the same as the flow selector of the modified TO 4 type. The second stream is lead to an additional sniffing port which can be used by the panel leader. A port selector brings the main stream to one of four sniffing ports (masks), installed in four separate boxes. This equipment has been set up in a caravan. To set it vertical it is mounted to a ball and socket. Four panelists can take place in front of their masks A sample bag can directly be connected to the olfactometer. The delay between... 

The installation of gas sensors to warn of gas leaks and the attendant risk of explosion is increasing in the developed world, especially in situations where bottled gas is stored, for example in caravans, trailers and boats. In the UK it is becoming commonplace to install them in homes along with smoke alarms. 

ISO 8818 1988 Leisure accommodation vehicles — Caravans — 12 V direct current extra low voltage electrical installations... 

Because of the mobile nature of caravans it is recommended that the electrical installation be tested and inspected at intervals considered appropriate, preferably not less than once every three years and annually if the caravan is used frequently (lET Regulation 721.514.1). 

The caravan or motor caravan must be provided with a mains isolating switch and an RCD to break all live conductors (Regulations 721.411). An adjacent notice detailing how to connect and disconnect the supply safely must also be provided, as shown in Regulation 721.514. Electrical equipment must not be installed in fuel storage compartments (Regulation 721.528.3.5). Caravans flex when being towed, and therefore the installation must be wired in flexible or stranded conductors of at least 1.5 mm cross-section. The conductors must be supported on horizontal runs at least every 25 cm and the metalwork of the caravan and chassis must be bonded with 4.0 mm cable. 

Because of the mobile nature of caravans it is recommended that the electrical installation be tested and inspected at intervals considered... 

State five regulations which are specifically relevant to special installations or locations on caravan parks and caravans. 

Where a combined neutral and earth conductor is used to supply a consumer s premises, the supplier must meet the protective multiple earthing requirements of Regulation 7, as well as ensure that the consumer s installation meets the criteria set out in the same Regulation for equipotential bonding and earthing. The neutral conduetor of PME supplies must not be connected through to metalwork in caravans or boats (refer to Part 6 of BS 7671 and Chapter 10 of this book for clarification). 

Division One of section 608 deals with installations in caravans and Division Two the earavan park distribution scheme. In the UK, the caravan supplies will invariably be at 230 V single-phase 50 Hz a.c. and caravans with mains voltage installations will usually have some Qass I equipment, so the protection system will be earthed equipotential bonding and automatic disconnection of the supply. 

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