Click here to make tpub.com your Home Page

Page Title: Static Electricity
Back | Up | Next

Click here for thousands of PDF manuals

Google


Web
www.tpub.com

Home

   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Logistics
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
   
   

 



DOE-HDBK-1092-98
operations cannot be shut down and personnel evacuated during electrical storms. Specific
operations shall be assessed for the risk of detonation of explosives by lightning. Such assessment
shall consider the need for the protection factors outlined in Appendix I, NFPA 780. When risk is
high, as in operations with highly sensitive electrostatic materials or components, operations shall
be conducted only in lightning-protected facilities. Approved lightning protection systems shall
conform with the requirements of Appendix I, NFPA 780. Examples of acceptable lightning
protection systems can be found in DOD 6055.9-STD, Chapter 7.
Lightning-protection systems should be visually inspected every 7 months and a report on their
conditions filed at least annually. Any evidence of corrosion, broken wires or connections, or any
other problem that negates the system's usefulness shall be noted and the problem repaired.
Lightning protection systems should be tested electrically every 14 months to ensure testing during
all seasons, or immediately following any repair or modification. The testing shall be conducted only
with instruments designed specifically for earth-ground system testing. The instruments shall be able
to measure 10 ohms 10% for ground resistance testing and 1 ohm 10% for bonding testing.
Electrical resistance readings shall be recorded.
Inspection records shall contain the most recent electrical test report and any subsequent visual
inspection reports for each building with a lightning-protection system.
5.1.4 STATIC ELECTRICITY
Static electricity shall be controlled or eliminated in areas where materials are processed or handled
that are ignitable by static spark discharge. This category includes spark-sensitive explosives,
propellants, and pyrotechnics, as well as solvent vapors and flammable gases. Approved systems to
dissipate static electricity shall conform to the requirements of NFPA 77 and IEEE 142.
5.1.4.1 BONDING AND GROUNDING EQUIPMENT
Bonding straps shall be used to bridge locations where electrical continuity may be broken by the
presence of oil on bearings, or by paint or rust at any contact point. Permanent equipment in contact
with conductive floors or tabletops is not considered adequately grounded. Static grounds shall not
be made to gas, steam, or air lines; dry-pipe sprinkler systems; or air terminals of lightning protection
systems. Any ground that is adequate for power circuits or lightning protection is more than adequate
for protection against static electricity.
5.1.4.2 TESTING EQUIPMENT GROUNDING SYSTEMS
Grounding systems shall be tested for electrical resistance and continuity when installation is
complete and, in the case of active equipment, at intervals to be locally determined. The grounding
system shall be visually inspected for continuity (before reactivation of the system) if the equipment
has been inactive for more than 1 month. All exposed explosives or hazardous materials shall be
removed before testing. During a test for resistance to ground, all equipment, except belt-driven
machines, shall be considered as a unit. In measuring the total resistance to ground for belt-driven
machinery (to ensure compliance with Section 5.1.4.3), resistance of the belt is to be excluded. All
conductive parts of equipment shall be grounded so that resistance does not exceed 25 ohms, unless
5-2


Privacy Statement - Press Release - Copyright Information. - Contact Us

Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business