ERICO Practical Guide to Electrical Grounding - Manual (Page 49)

41 Chapter 2: Building Lightning Protection
Fig. 2-45
Structural steel may be used as the conductor if
properly bonded.
Fig. 2-46
Air terminal placement on ridged roofs vary with
ridge height in relation to the other ridges.
A
A
A
A A
A
B
B
Ridge Higher
Than Outer Ridge
Ridge Equal To
Or Lower Than
Outer Ridge
Close ( 20' Or 25') Spacing 50' Spacing
Air Terminal Spacing On Roofs With Multiple Ridges
Fig. 2-42
Concealed systems are common on residential
installations.
#2/0
CADWELD
Connection
Finished Roof
24 Inch
Maximum
Fig. 2-43
Detail of air terminal with the steel structure used
as the down conductor.
Fig. 2-44
Detail of air terminal with the steel structure used
as the down conductor.
Finished Roof
#2/0
Silicone Sealant
CADWELD Connection
Grounding Book 4/14/99 10/5/99 6:01 PM Page 41 (Black plate)