34 practical guide to electrical grounding – ERICO Practical Guide to Electrical Grounding User Manual
Page 42
34
Practical Guide to Electrical Grounding
10. Section 3-19.4: Where the building structural steel
is used as the main conductor of the lightning
protection system, a ground rod or other ground
terminal shall be connected to approximately every
other perimeter steel column. Such connection shall
be made at the base of the column and at intervals
not to exceed an average of about 60 feet.
10" Min
10" Min
10" Min
>1/2 H
>1/2 H
H = Over 24"
H = Over 24"
Air Terminals Height And Supports
Fig. 2-16
Fig. 2-18
No Air Terminal; Roof Edge
Covered Under Higher
Air Terminal Protection.
150 Foot
Radius
20' MAX
25' MAX
24" Or
Higher
Less
Than 24"
Fig. 2-17
Air terminals less than 24” in height are located at
20 feet maximum intervals. If 24 inches or higher,
they can be spaced at 25 feet intervals.
Air terminals located in areas where personnel
may be present, 60 inch terminals are
recommended at mid-roof locations.
Grounding Book 4/14/99 10/5/99 6:01 PM Page 34 (Black plate)
- 6Z34VF14 Rod Hanging Basket Tray Clip (1 page)
- 766PM Far Side Box Support (1 page)
- 766PMD Far Side Box Support (1 page)
- CADDY MPVTI Low Voltage Mounting Clip (2 pages)
- H-Series CADDY PYRAMID Support System (3 pages)
- CADDY PYRAMID RL, PIPE RETAINERS (2 pages)
- CADDY PYRAMID Rooftop Equipment Support (4 pages)
- CADDY PYRAMID Single Post Support (1 page)
- CADDY PYRAMID TF Series, Fixed Height Tool-Free Supports (2 pages)
- CADDY ROD LOCK Anchor Screw (2 pages)
- CADDY ROD LOCK Beam Clamp (2 pages)
- CADDY ROD LOCK Channel Nut (2 pages)
- CADDY ROD LOCK L-Bracket (2 pages)
- CADDY ROD LOCK Strut (2 pages)
- CADDY SPEED LINK Riveted Accessories (4 pages)
- CADDY SPEED LINK SLK-Keyless Locking Device and Bulk Cable (2 pages)
- CADDY SPEED LINK SLK-Keyless Locking Devices (2 pages)
- CADDY SPEED LINK-Accessory Cables (1 page)
- CADDY SPEED LINK-SLK Cable End Accessories (4 pages)
- TSGB Series Screw Gun Bracket (2 pages)
- GLIDER Electrical Box Attachment (2 pages)
- H Series-Electrical Box Bracket (2 pages)
- ROD LOCK Plywood Pre-set Anchor (2 pages)
- ROD LOCK Strut End Bracket (2 pages)
- ROD LOCK Strut (2 pages)
- CADDY ROD LOCK Strut Nut (2 pages)
- CER4 Cable from Stud (2 pages)
- High Performance CADDY CAT HP J-Hook Assemblies (6 pages)
- KBT Wire Basket Tray Clip (1 page)
- MPCB1220 (2 pages)
- SBC Series, Beam Clamp, 3/8" and M10 (1 page)
- TSR200 Telescoping Strut Replacement Bracket (2 pages)
- TSRBS1625 Telescoping Box (3 pages)
- Universal Pedestal Clamp (2 pages)
- Branch Line Restraint Device (2 pages)
- Branch Line Restraint Strucural Attachment Fitting for Steel 12 gauge (2 pages)
- Branch Line Restraint, Structural Attachment Fitting for Concrete or Wood (2 pages)
- Branch Line Restraint, Structural Attachment Fitting with 3/8"-16 male thread" (2 pages)
- 510 CADDY EZ RISER (2 pages)
- 429 CADDY MACROFIX PLUS NI (1 page)
- Seismic Hanger Clamps (3 pages)
- CADDY PYRAMID Equipment Supports (3 pages)
- CADDY ROD LOCK Bottom-Mount Duct Bracket (2 pages)
- Bottom-Mount Duct Bracket, Narrow (2 pages)
- Top-Mount Duct Bracket (2 pages)