Mains Unit - Bailey Caravan Owner's Manual

A means of checking the polarity of the mains supply when overseas is useful.
There are available several proprietary makes of equipment for the purpose (e.g. Martindale tester
unit).
If it can be achieved, it is preferable to connect live to live, and neutral to neutral to maintain full
electrical protection.
Check all caravan equipment is set-up to accept the site supply before actually switching on.
3.3.5

Mains unit

The mains unit replaces the conventional fusebox. Similar, but larger units are often fitted in newer
houses.
The unit gives overload and earth leakage protection for the 230v electrical supply in your caravan.
For normal operation all switches on the unit need to be in the ON position. The switches on the left of
the unit are known as M.C.B.'s (miniature circuit breakers).
These take the place of the conventional fuse but are more convenient.
In the event of a fault the M.C.B. 'trips' i.e. automatically moves to the OFF position.
After elimination of the fault the M.C.B. can be re-set by switching to the ON position. (Against the
spring pressure in an upwards direction).
If an earth fault develops or a person was to touch a live piece of equipment the leakage of current to
earth should immediately operate the RCD (residual current device) and 'trip' the main switch, to the
OFF position.
This switch is only re-settable after elimination of the fault.
To re-set, operate the switch as for M.C.B's.
Every time you connect to a site supply the RCD should be checked by operating the test button
marked 'T'. The unit should immediately switch to the OFF position. If the unit does not switch off then
a qualified electrician should be consulted.
If the unit does switch off, the test is complete and the switch can be reset restoring the supply back to
normal.
▲ Having too many appliances switched on at the same time will trip the MCB. This is a
safety measure.
▲ It is essential that connections are made exactly as shown. If terminal markings are not
in accordance with the diagram they must be ignored. If in doubt consult a qualified
electrician.
▲ Always disconnect the electrical connector between the towing vehicle and the caravan
before connecting a 230v supply to the caravan and before charging the caravan battery
by any other means.
It is possible that all of the 230v mains electrical equipment may not be able to be operated simultaneously.
A typical UK caravan park mains hook up point provides a maximum output of 16 amps and on some
continental sites the available output may be as low as 5 amps. If your loading exceeds the site supply
it may trip the parks circuit breaker. Please check the available mains output with your site operator.
The following items need to be added together if used simultaneously.
Caravan Service Systems
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