SPECIAL APPLICATIONS
Hazardous Applications
• If a System
3000
solution is proposed, the
design and report must be completed by a
member of the nVent ERICO Applications
Engineering team and must be presented
to the customer in its entirety.
• It is recommended to perform a risk
analysis study of the area and the facility
to a local relevant standard.
• The system shall be designed to the
highest protection level of
99
%.
• The mast assembly cannot be directly
mounted to hazardous structures. They
must be installed on free standing poles
as an isolated system.
• Ericore cable must be used. Conventional
conductor is not allowed.
• Air terminals at facilities with potentially
explosive atmospheres, where
combustible fumes are emitted from a
vent or stack must be placed in
non-hazardous areas where a combustible
mixture of fuel and oxygen will never occur
under worst case conditions.
• The grounding and bonding system must
be designed in compliance with the latest
revisions of relevant national or international
standards that specifically address the topic
of grounding and bonding in explosive or
flammable facilities.
• If a site does not have a proper grounding
and bonding system, the earth potential
rise caused by a lightning strike may cause
arcing and side flashing between metallic
objects on the site. If grounding and/or
bonding system is neglected or poorly
implemented, the pipes, tanks, scaffolds
and catwalks may develop dangerous
potential differences and generate sparks,
which can cause explosions.
Conventional Cable as the
Downconductor
• nVent ERICO manufactures components
allowing connection of the conventional
conductor with the Dynasphere terminal.
• A FRP mast shall not be used with
conventional conductor. An aluminum
mast may be used.
• In some short-run installations,
conventional cable can be used.
These installations must incorporate
2
conventional downconductors and
comply with applicable national and
international standards. Splice the
conventional lightning cable after it exits
the mast. In these cases, a Terminal
Lug Coupling Adaptor will be supplied
with a Cadweld mold (LAC
8
D
002
) and
weld metal (
90
PLUSF
20
) to connect
LPC
126
RL
250
cable to the base of the
Dynasphere (see Figure
25
).
• Each Dynashpere air terminal requires
at least two downcoductors that should
be routed to ground on opposite sides
of the building. They should each have
a separate grounding system or bond
into the buildings existing counterpoise
grounding.
• There is no limitation on length of the
conventional conductor. Since nVent
ERICO is supplying the conductor, the
conductor should be Class II PN LPC
126
or equal and LPA
105
or equal where
Standard NFPA
780
is used and minimum
of
50
mm² (
98
.
7
kcmil) conductor in other
regions where IEC standards is applicable.
• Since the conductor is exposed, the
bonding principles should comply
with the latest revisions of the local or
international standards.