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  :: °ü¸®ÀÚ 2007-06-13 16:38:15 , Á¶È¸ :299210  
  :: File download   [ppt : 773 KB  Download: 7696]
LIGHTNING PROTECTION for AIR FORCE FACILITIES
 
 
INTRODUCTION
 

The intent of this course is to familiarize and improve the skills of personnel involved in the installation and maintenance of lightning protection systems.

 

We will discuss the design, installation, and maintenance of lightning protection systems for structures housing explosives in accordance with applicable standards.

 
REGULATORY GUIDANCE
 

AFMAN 91-201 – Implements AF policy and DOD 6055.9 STD

It applies to everyone involved in any explosive operation in the Air Force, and compliance is mandatory. Chapter 2, Section D deals with; Electrical Hazards; Hazardous locations (2.46), Electrical Service (2.48), Static (2.51 & 2.52), Grounds (2.53), Lightning Protection (2.54)

DOD 6055.9 STD – Defines minimum explosive safety criteria for the design, maintenance, testing and inspection of lightning protection systems.

AFI 32-1065 – Implements maintenance requirements of DOD 6055.9 STD, chapter 7  ¡°Lightning Protection¡± and assigns maintenance responsibilities and requirements for grounding, static, and lightning protection systems on Air Force installations.

NFPA 780 – (1997 edition) Provides practical safeguarding for persons and property from hazards arising from exposure to lightning. Does not cover: explosive manufacturing buildings and magazines.

 
MATERIAL REQUIREMENTS
 
AFI 32-1065 Requirements
 
NFPA 780 Requirements
 
Main Conductor Example
 
AFI 32-1065 Requirements
14.1. General. Systems must comply with NFPA 780 and AFM 88-9, Chapter 3, Electrical Design Lightning and Static Electricity Protection (except as modified herein). Early streamer emission systems or charge dissipation systems are not permitted. Parts and materials must carry the Underwriters Laboratories (UL) label or equivalent. Otherwise, such components must be approved by the MAJ-COM electrical engineer in charge of lightning protection. Facilities in foreign countries may use host nation codes and standards if they offer equivalent protection, as determined by the MAJCOM electrical engineer with concurrence from HQ AFCESA/CESE and approval of the DoD Explosive Safety Board (DDESB). Otherwise, the Status of Forces Agreement (SOFA) must permit their use. Where the SOFA requires compliance with host nation codes, translate those required codes into English, make them available to all appropriate personnel, and perform necessary training. Maintain all installed systems according to this instruction. If not required, remove the system with coordination through the using agency.
 
NFPA 780 Requirements

Material Requirements, Class I
Table 3.1.1 (a) NFPA 780
Buildings and Structures less than 75 feet in Height
Material Requirements, Class II
Table 3.1.1 (b) NFPA 780
Buildings and Structures greater than 75 feet in Height

 
Main Conductor Example

NO. 29R
Copper cable consisting of 29 strands of No. 16 AWG wire.
This cable has a cross-sectional area of 72,500 cm and a weight of 215 pounds per 1000 feet.
The outside diameter is approximately 3/8".

 
STRIKE TERMINATION DEVICES
 
NFPA 780 Requirements
 
Air Terminal Height
 
Air Terminal Support
 
Chimneys and Vents
 
 
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