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connector of the mast butt adaptor. All conventional downconductors should be lugged and
fixed to the terminal per Figure 10
∆
For structures made of combustible materials, downconductors must be separated from
the structure by a distance of at least 0.1 m and they must have a cross-sectional area of
100 mm
2
Installation on structures:
∆
Minimum of two downconductors are required, preferably on opposite sides of the
structure
∆
If natural components of the structure are used, electrical continuity to ground must be
checked
∆
For installations where multiple Guardian Plus terminals are installed, the requirement
for two downconductors per terminal is waived
Standalone / isolated / freestanding mast installation:
∆
Only one downconductor is required
∆
Natural components, e.g., steel mast, may be used if it complies with the requirements
for downconductors (in general, a minimum cross-sectional area of 50 mm
Routing and installation:
∆
Install externally wherever possible. Internal installation requires routing inside a non-
flammable insulating pipe
∆
Keep the path as direct and straight as possible
∆
Avoid sharp bends. Bend radius must not be smaller than 20 cm
∆
Avoid routing along or across electrical conduits
∆
Use three fasteners per metre
∆
Protect against the risk of mechanical impact damage with guard tubes up to a height
of at least 2 m above the ground level
Natural components:
∆
External interconnected steel frames (metal structures) may be used in place of ded-
icated downconductors if it is shown that the electrical continuity / resistance is ≤ 0.1
∆
Internal metallic structures, concrete reinforcements, metal structures inside
walls, metal sheets and pipes at least 2 mm thick may be used to supplement
dedicated downconductors(s)
20
LIGHTNING PROTECTION INTERNATIONAL PTY LTD
)
2
W
www.lpi.com.au
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