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 MIL-HDBK-419A
(a)
CONE OF PROTECTION PROVIDED BY A VERTICAL
GROUNDED CONDUCTOR OF HEIGHT H.
(b)
ZONE OF PROTECTION PROVIDED BY A HORIZONTAL
AERIAL GROUND WIRE AT HEIGHT H.
Figure 3-6. Zones of Protection Established by a Vertical Mast and a Horizontal Wire
REFERENCE
RECOMMENDED FOR
D/H
o
AOA'
ORDINARY CASES
63
NFPA 78
2/1
IMPORTANT CASES
NFPA 78
o
45
BOB'
1/1
ORDINARY STRUCTURES
BRITISH CODE
CRITICAL STRUCTURES
30
BRITISH CODE
o
0.58/1
COC'
Figure 3-7. Some Commonly Used Lightning Shielding Angles
3-14
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