WARNING
HIGH ENERGY DISCHARGE HAZARD
RISK OF PERSONAL INJURY OR EQUIPMENT DAMAGE
Selection and installation of surge protectors as per these
standards does not completely eliminate the possibility of
personal injury or equipment damage due to lightning or
similar surges, but it does sufficiently protect persons and
equipment from the majority of these hazards.
Cabling and equipment are susceptible to induced surges from lightning as well as power
generation equipment. The risk related to each source is different based on installation location.
The purpose of a surge arrester is to protect persons and equipment from electrical surges
induced by lightning, static discharge, or other high-voltage electrical faults.
Surge arresters must be appropriately grounded using dedicated conductors connected
directly to earth ground instead of locally available grounding points as these could be at a
higher potential than a direct earth connection.
Indoor Connection
When equipment and cabling is installed within an enclosed environment, the risk related to
lightning is less since enclosures such as buildings would typically have lightning protection
features incorporated by design. However, there are still risks to persons and equipment from
sources of surges within the enclosed environment. Where surges over 1 kV can occur, additional
surge suppressors should be installed on the relevant equipment ports to protect from
supply-side surges.
Partial Indoor / Outdoor Installation
The same consideration for supply-side surges as in indoor installation are relevant when the
equipment is installed within a lightning-protected, enclosed environment and cabling to
associated equipment extends into an area with no direct lightning risk.
Lightning-induced EMP can result in very high current and voltage levels in the system. Where
cabling and associated equipment may be exposed to lightning induced EMP, appropriate surge
arresters should be selected and installed at the point where the cabling or associated
equipment enters the protected environment.
Outdoor Installation
When equipment is installed in an area outside of a lightning-protected, enclosed environment
with no direct lightning risk, appropriate surge arresters should be selected and installed
between the equipment and further connected equipment within the protected area and
between the equipment and any associated equipment outside of the protected area.
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Ranger Pro ISA100 Wireless Gateway
User Guide
158M1430 Rev. -
