ERICO Practical Guide to Electrical Grounding - Manual (Page 52)

44 Practical Guide to Electrical Grounding
Fig. 2-57
Flat or gently sloping roofs are defined as shown.
Fig. 2-56
Air terminal placement shown on various types of roofs.
1
1
8
4
40' Or Less Over 40 Feet
Flat Or Gently Sloping Roof
Flat Gable Hip Mansard
Roof Types And General Air Terminal Placement
Fig. 2-58
Protected areas can be determined using a sloping line, with the angle dependent on the height of the structure.
2
1
Protected Protected
Building Not Over 25' High
1
1
Building Over 25' But Not Over 50' High
50 Feet
Or Less
25 Feet
Or Less
Grounding Book 4/14/99 10/5/99 6:01 PM Page 44 (Black plate)