Mains Unit - Swift Rio Owner's Handbook Manual

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MAINS UNIT

This acts as the main switch for the
motorhome allowing isolation of all circuits. It
forms part of the Power System along with
the Transformer/Charger Unit (if fitted).
The mains unit replaces the conventional
fusebox. Similar, but larger ones are often
fitted in new houses.
The unit gives both overload (MCBs) and
earth leakage protection (RCD) for the
electrical supply in your motorhome.
For normal operation all switches on the unit
need to be in the ON position. The small
switches on the unit are known as MCBs
(miniature circuit breakers).
These take the place of the conventional fuse
but are more convenient.
Note: Having too many appliances switched
on at the same time will trip the MCBs. This
is a safety measure. (For appliance ratings,
see mains consumption, right).
Trip Trip
RCD RCD
Mains Unit Mains Unit
In the event of a fault the MCB 'trips' i.e.
automatically moves to the OFF position.
After elimination of the fault the MCB 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 touches
a live piece of equipment the leakage of
current to earth should immediately operate
Electrical Systems
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 MCB's.
Periodically 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 re-set
restoring the supply back to normal.
Add together the current ratings for each
electrical appliance you wish to use
simultaneously and ensure the total does not
MCB
MCB
exceed 10A. You will find the following table
a useful guide to typical values.
230V MAINS CONSUMPTION
FRIDGE
CHARGER
WATER HEATER
Formula for calculating current consumption
of appliances:
Watts
= Amps
Volts
0.5A
0.5A
2.75A
35