4.1.1.4 Limits for electric fence energizers apply to
a) the fence terminals on all energizers (columns 4 and 5 of Table 1);
b) the mains terminals on energizers designed for connection to the mains (columns 2 and 3
of Table 1);
c) the battery terminals on energizers designed for operation from a battery (columns 4 and
5 of Table 1).
However, no limits apply to the battery terminals of energizers with built-in batteries which
cannot be connected to the mains supply, or energizers with external batteries if the
connecting lead between the energizer and the battery is shorter than 2 m and is not
applicable of being easily extended by the user without special tools.
Type D energizers, according to IEC 60335-2-76, are measured as battery operated
energizers with connecting leads between the energizer and the battery greater than 2 m in
length.
NOTE In practice, the fence wire can also act as an active source of disturbances, due to the high-voltage discharges, in particular to radio and telecommunication networks. Manufacturers of electric fence energizers should instruct the users to eliminate discharge points such as touching vegetation or a broken fence wire.
4.1.1.5 For battery operated appliances (with built-in batteries, as well as with external
batteries) which can be connected to the mains the limits of columns 2 and 3 of Table 1 apply
to the mains terminals.
No radio disturbance limits apply to appliances with built-in batteries, which cannot be
connected to the mains supply.
No radio disturbance limits apply to appliances with external batteries, if the connecting lead
between appliance and battery is shorter than 2 m. If the connecting lead is longer than 2 m
or easily extendable by the user without special tools, then the limits of columns 4 and 5 of
Table 1 apply to these leads.
4.1.2 Frequency range 30 MHz to 1 000 MHz
4.1.2.1 Disturbance power measurement in the frequency range 30 MHz to 300 MHz
The limits of the disturbance power are given in Table 2a. Disturbance power is measured in
accordance with Clause 6, at all terminals.