23
Gallagher 3E1164 Power Fence Systems User Manual
Installing a Permanent Power Fence
TM
ELECTRICAL RESISTANCE CHART
Use this Electrical Resistance Chart to decide which wire/cable to use.
Wire/Cable
Resistance
Application
Gallagher Cyber
Cable G91301
1.5 ohms/km
(2.4 ohms/mile)
Recommended for use in conjunction with G91300 Cyber
Wire. Ideal for leadout and cabling through buildings.
Cabl
e
Underground high
conductive leadout
cable G6272
11.5 ohms/km
(19 ohms/mile)
Ideal for long distances underground, for leadout and earth
cabling through buildings or where there are numerous
gateways in the leadout system.
Underground
double insulated
cable 2.5mm (12.5g)
G6270
35 ohms/km
(56 ohms/mile)
Ideal for leadout and earth cabling through buildings or
where there is undergate cabling.
Double insulated
cable 1.6mm (16g)
G6090
100 ohms/km
(160 ohms/mile)
Ideal for under gateways or through buildings with low
powered energizers.
Gallagher Cyber
Wire 500m (1640’)
G91300
1.5 ohms/km
(2.4 ohms/mile)
Recommended for use with very high powered energizers
when carrying power over several kilometres. 23 times more
conductive than 2.5mm (12.5g) HT wire. Ideal for post
mounted or overhead leadouts.
Wir
e
Gallagher
PowerWire high
conductive wire
1220m (4000’)
G9312
9.5 ohms/km
(15 ohms/mile)
Ideal for post mounted leadouts (including offset
brackets), not overhead leadouts. More than three times
the conductivity of 2.5mm (12.5g) galvanized wire. Not
recommended for extreme climates.
Gallagher XL high
conductive wire
1000m (3280’)
G9290
11.5 ohms/km
(19 ohms/mile)
Ideal for conventional and power fencing in coastal
conditions, and for overhead and offset leadouts. Three
times the conductivity of 2.5mm (12.5g) galvanized wire.
4mm (8g) galvanized
mild steel wire
14 ohms/km
(23 ohms/mile)
2.5mm (12.5g) high
tensile galvanized
wire
35 ohms/km
(56 ohms/mile)
Recommended for electric fencing because it retains its
tension far longer than soft wire. It is reasonably easy to
use and conducts enough current for most situations when
connected in parallel.
1.6mm (16g) low
tensile wire
100 ohms/km
(160 ohms/mile)
Only recommended for use with energizers less than 1 joule.
Figure 4.13
Resistance examples:
A dead short is 0 ohms.
Copper is a good conductor, 1cm³ is 0.000,000,1 ohms.
Glass is a good insulator, 1cm³ is 1,000,000,000 ohms.
A corroded or loose connection can be 5000 ohms.
Selecting a leadout wire/cable
When selecting a leadout wire/cable, it is important to remember that:
1. The longer the wire, the higher the resistance.
2. The heavier the cable (larger the diameter) the lower the resistance.