User's Guide

17 September 2021

NG Series Industrial Wireless Gateway User Guide

DIVIGRAPH

Doc No. 20DD1980

Revision 4

! 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 their own conductors directly to earth ground

instead of locally available grounding points as these could be at a higher potential than a direct earth

connection.

Indoor Installation

When equipment and cabling is installed within an enclosed environment, the risk related to lightning is

less as enclosures such as buildings would typically have lightning protection features incorporated by

design. However, there are still risks to persons and the equipment from sources of surges within the

enclosed environment. Where surges over 1kV 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 as well as between the equipment and any

associated equipment outside of the protected area.