The sensitivity
of farm animals electric shock means that they can contained an
electric fence. All the dan-
gers which exist buildings are present and around caravans, including
the added dangers associated with repeated connection and disconnec-
tion the supply and the flexing the caravan installation moving
vehicle. Agricultural and horticultural
installations should tested and inspected accordance with Part of
the Wiring Regulations every years.41. There are 3.
.
Earth electrodes connected the earth terminal electric fence con-
troller must separate from the earthing system any other circuit and
should situated outside the resistance area any electrode used for
protective earthing. The output voltage the controller must not
exceed 10kV and the energy must not greater than 5J. 14. The electric fence controller and the fence wire must
be installed that they not come into contact with any power, tele-
phone radio systems, including poles. The energy levels are very low 5J. This shock level very simi-
lar that which can experienced touching spark plug lead a
motor car. There must no
risk any human coming into contact with the controller, which should
be manufactured 2632.
The pulses are generated capacitor–resistor circuit inside the control-
ler which may mains battery operated (capacitor–resistor circuits
are discussed Advanced Electrical Installation Work). animal touching the fence receives short pulse elec-
tricity which passes through the animal the general mass earth and
back earth electrode sunk near the controller, shown Fig.Electrical installations and wiring systems
327
Horses and cattle have very low body resistance, which makes them sus-
ceptible electric shock voltages lower than 25V rms.
Caravans and caravan sites
The electrical installations caravan sites, and within caravans, must
comply all respects with the wiring regulations for buildings.
Controller Cow
Fence
wire must
not be
barbed
Earth
electrode
Path
of current
Pasture
land
FIGURE 14. The duration of
the pulse must not greater than 1.5ms and the pulse must never have a
frequency greater than one pulse per second. The 17th edition the Regulations has devoted Section 721 the
electrical installation caravans and motor caravans and Section 708 to
caravan parks.41
Farm animal control electric fence.
Safety First
Electric shock
Animals and humans must be
protected against electric shock.6 million joules
of energy 1kWh
