nVent.com/ERICO | 5
Due to ongoing research into the phenomena of lightning and lightning protection
technology and product improvement, nVent ERICO reserves the right to alter any
information and specifications contained herein at any time without notice. Users
should check with nVent ERICO to ensure they have the latest edition.
Lightning protection standards outline design or calculating methods, to place air
terminals on structures. i.e. they calculate the attractive or protection radius of a
particular air terminal in accordance with each particular design method, so that
the air terminals can be manually positioned on structures to provide the best
coverage. The common design methods for each of these standards are based on
the Electro-Geometric Model.
The design method employed to position the System air terminals on the
structure, the Collection Volume Method (CVM), is based on an improved Electro-
Geometric Model. Similar to the rolling sphere or striking distance formulae used
generally in lightning protection standards, the CVM employs additional lightning
parameters in its striking distance formulae, namely electric field intensification
factor, and structure height and physical shape. The formula in the CVM also takes
into account such parameters as the velocity ratio of the lightning down-leader to
up-leader streamers, humidity and the height above sea level.
As a system, the combination of the products and the placement method used in
the design and installation of the nVent ERICO System does not comply with
any particular standard. However, the actual components of the System are in
full compliance with certain standards (in terms of lightning current handling ability,
material of construction, etc). The Dynasphere air terminal is UL listed and complies
with standard UL, emphasizing the compliance to accept lightning current exposure.
Since system does not comply with any particular standard, it is important
to follow the instructions published in the nVent ERICO System Installation,
Operation and Maintenance Manual. nVent ERICO offers inspection services for
system installations and can issue a Certificate of Installation Compliance for
qualifying installations.
nVent ERICO System
INSTALLATION, OPERATION AND MAINTENANCE MANUAL
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