situations accessible livestock the electrical equipment
should type which appropriate for the external influences likely to
occur, and should have least protection IP44, that is, protection against
solid objects and water splashing from any direction (Regulation 705.512.
In buildings intended for livestock, all fixed wiring systems must inac-
cessible the livestock and cables liable attacked vermin must be
suitably protected (IEE Regulation 705. 14.
PVC cables enclosed heavy-duty PVC conduit are suitable for installa-
tions most agricultural buildings. 110V distribution unit shown Fig.
Edison screw lamps are used for 110V lighting supplies that they
are not interchangeable with 230V site office lamps.
Cables buried agricultural horticultural land should buried a
depth not less than 600mm, 1000mm where the ground may culti-
vated, and the cable must have armour sheath and further protected
by cable tiles. Overhead cables must insulated and installed that they
are clear farm machinery placed minimum height com-
ply with Regulation 705. All socket outlet cir-
cuits must protected RCD complying with the appropriate British
Standard and the operating current must not exceed 30mA.40. many situations,
waterproof socket outlets 196 must installed.1).2. these circumstances safety extra-low voltage
(SELV) supply would required.
There are occasions when even 110V supply from centre-tapped trans-
former too high, for example, supplies inspection lamps for use inside
damp confined places.
Industrial plugs have keyway which prevents tool from one voltage
being connected the socket outlet different voltage.2,
see also Fig.2).
Agricultural and horticultural installations
Especially adverse installation conditions are encountered agri-
cultural and horticultural installations because the presence live-
stock, vermin, dampness, corrosive substances and mechanical damage.Basic Electrical Installation Work
326
in most locations.522.
The 17th edition the IEE Wiring Regulations considers these installations
very special locations and has devoted the whole Section 705 their
requirements.3). All exposed and extraneous metal-
work must provided with supplementary equipotential bonding in
areas where livestock kept (Regulation 705. They are also
colour coded for easy identification follows:
400 red
230 blue
110 yellow
50 white
25 violet.
.513. 13.415
