Cantilevered
Used in situations where it is more practical
to mount without a base, eg: radio towers or
the sides of buildings.
One third of the lower mast should be
secured against the structure. Detailed
installation sheets are available at
www.erico.com
nVent ERICO offers a custom steel mast
where guying is not possible
Freestanding
Often used where the terminal,
downconductor and grounding system are
isolated from volatile areas by installing
the nVent ERICO System
3000
at least
5
m (
17
ft.) away from those areas.
The free standing mast requirements for
foundations and erections are generally
handled by the mast manufacturers .
Mast Bases
nVent ERICO supplies two types of
aluminum bases to suit:
• nVent ERICO brand of FRP masts
(aluminum base with an internal
mast spigot)
• Aluminum masts (welded directly onto the
required length of mast)
Both base types have downconductor
exit holes in the base, required if the
downconductor is to be routed inside of
the mast. They also have identical
mounting hole dimensions which are
shown (Figure
18
).
Mast Wind Loading
• nVent ERICO does not warrant the
installation of the nVent ERICO System
3000
, only the components.
• All installations approved by nVent ERICO
Engineering are listed in nVent ERICO
Lightning Protection Mast Wind Ratings
Manuals, one for North America and one
for worldwide use.
• Mast installations that do not meet the
installation prints included in the nVent
ERICO Mast Wind Loading Ratings
Manual, automatically voids the
product warranty.
• Based on these manuals, nVent ERICO
Engineering can provide forces exerted
on the brackets and guy wires, by
certain maximum wind speeds. This
information helps the structural engineer
to select the proper hardware to support
the installation.
• nVent ERICO documented wind load
ratings are available upon request
If the lower section of the mast
is conductive, i.e. aluminum or
galvanized iron; then:
• It must be electrically bonded to the
nearest conductive structural point.
This may be either structural steel
work or concrete reinforcing. Refer to
page
20
for details.
• The downconductor must be
secured to the mast at
1
m (
40
in.)
intervals (max.).
Three basic types of mast
configuration include:
Guyed
Single length guyed - one section of FRP
(Fiberglass Reinforced Plastic) mast
material guyed at the top.
