Operating Guide

United States
Tel: [phone]
800.816.7809
Fax: [phone]
Technical Services
Tel: [phone]
www.tnb.comwww.tnb.com
United States
Tel: [phone]
800.816.7809
Fax: [phone]
Technical Services
Tel: [phone]
26
Connectors & Grounding — Blackburn
®
Grounding Systems
Ground Rod Clamps
A dependable ground connection
offered at a substantial savings.
Type G — Budget-Line Ground Clamps
• Cast of high-strength corrosion-resistant copper alloy
• Furnished with hex head bolts
• Simplified, compact design makes lasting, trouble-free connection
• UL
®
Listed for direct burial
CAT.
NO.
NOMINAL ROD DIA. WIRE RANGE DIMENSIONS (IN.)
(IN.) (MM) MAX. MIN. MAX. (MM
2
) MIN. (MM
2
)
A (MAX.)
BOLT SCREW THREAD SIZE UNC-2A B C D E
G3*
3
⁄8 9.5 4 Str. 10 Sol. 21.1 5.2 1
3
⁄8
5
⁄16–18
11
⁄16
1
⁄2
27
⁄64
3
⁄8
G4
1
⁄2 12.7 2 Str. 10 Sol. 33.6 5.2 —
3
⁄8–16
27
⁄32
3
⁄8
37
⁄64
1
⁄2
G5‡
5
⁄8 15.8 2 Str. 10 Sol. 33.6 5.2 —
3
⁄8–16
29
⁄32
3
⁄8
43
⁄64
1
⁄2
G6
3
⁄4 19.0 2 Str. 10 Sol. 33.6 5.2 —
3
⁄8–16 1
1
⁄16
3
⁄8
13
⁄16
1
⁄2
* Not UL Listed.
‡
RUS Accepted.
Add suffix P to Cat. No. for tin-plated clamp.
Axial groove keeps wire and rod in perfect alignment.
Types GG and GGH — Heavy-Duty Ground Rod Clamps
• Cast of high-strength corrosion-resistant copper alloy
• Both hex head bolts and socket set screws available
• Floating pressure bar distributes pressure evenly over large area of ground wire
CAT. NO.* NOMINAL ROD DIA. WIRE RANGE DIMENSIONS (IN.)
SOCKET SET
SCREW
HEX HEAD
BOLT (IN.) (MM) MAX. MIN. MAX. (MM
2
) MIN. (MM
2
)
A (MAX.)
SOCKET
SCREW
A (MAX.)
HEX BOLT
SCREW
THREAD SIZE
UNC-2A B C
GG12 GG12H
1
⁄2 12.7 2 Str. 8 Sol. 33.6 8.3 1
13
⁄64 1
13
⁄16
7
⁄16–14
27
⁄32
15
⁄16
GG58 GG58H
5
⁄8 15.8 2 Str. 8 Sol. 53.6 8.3 1
51
⁄64 2
7
⁄32
7
⁄16–14
61
⁄64
15
⁄16
— GG34H
3
⁄4 19.0 4/0 Str. 8 Sol. 120.6 8.3 — 3
1
⁄2–14 1
3
⁄8 1
1
⁄4
* Add suffix P to Cat. No. for tin-plated clamp.
GG34H has no pressure bar or axial groove.
E
D
A
MAX.
B C
Socket Size = .219
Type GG
A
MAX.
C
B
Width Across Flats =
1
⁄2"
Type GGH
A
MAX.
B
C
DB
1211_1836_TNB_TNB_Power Connection & Control Cat31_r7.indd 26 2/24/14 3:27 PM