Surge Suppression
e-Watch Corporation strongly recommends all components of the IP Video Surveillance
system be properly grounded and protected from surges. Additionally, all outdoor devices
should be protected, to the greatest extent possible, from lightning strikes. We do not
certify any particular grounding, surge suppression or lightning protection system.
Please consult you local codes and employ a professional for design, installation and
use of surge suppression, lightning protection and grounding systems.
Grounding –
- When we talk about grounding outdoor IP Video Surveillance equipment against fast
transients (lightning), we are referring to an earth ground, not an electrical 3rd wire
ground. A 3rd wire ground is not sufficient. NFPA-780 recommends ground rods to be not
less than 1/2” in diameter and 8 feet long.
- A Pelco Spectra III camera should have its own ground. The ENC-3XX should not be the
ground path for the camera.
- If the e-Watch camera/encoder is powered from a different AC branch circuit than the
third party devices, the two third-wire grounds must be at the same potential.
Standards –
- NFPA-780: A summary of the NFPA-780
“Standard for the Installation of Lightning Protection Systems” may be found on
our website.
- DOD-6055.9 STD: Chapter 7 of the
6055.9 which has to do with lightning protection may be found on our website.
- IEEE STD 142-1991: The abstract
and TOC for the IEEE “Recommended Practice for Grounding of Industrial and Commercial
Power Systems” may be found on our website.
Additional useful reference documents:
- “Stealth Laboratories Surge Suppression Technology Guide” at http://www.stealthlabs.com/surgeguide.pdf
provides a general discussion of the different types of surges which must be protected
against for any electrical, telephone, data or video system. While their products are
generally aimed at manufacturers of such equipment, not the installers, this discussion
sheds light on an important issue.
- The Lightningmike website provides a document titled “Wiring and Grounding” http://lightningmike.com/wiring-and-grounding.asp
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