Operating Guide
United States
Tel: 901.252.8000
800.816.7809
Fax: 901.252.1354
Technical Services
Tel: 888.862.3289
www.tnb.com
www.tnb.com
United States
Tel: 901.252.8000
800.816.7809
Fax: 901.252.1354
Technical Services
Tel: 888.862.3289
25
Connectors & Grounding — Blackburn
®
Grounding Systems
Ground Rod Clamps
Long bearing surface
of clamp on ground wire
secures ground connection.
Type JAB — Ground Rod Clamps
• Cast of high-strength corrosion-resistant copper alloy
• Both hex head bolts and socket set screws available
• UL
®
Listed for direct burial
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 D
JAB12* JAB12H
1
⁄2 12.7 2 Str. 10 Sol. 33.6 5.2 1
19
⁄32 2
3
⁄32
7
⁄16–14
27
⁄32
7
⁄8
19
⁄32
JAB58 JAB58H
5
⁄8 15.8 1/0 Str. 8 Sol. 53.4 8.3 1
27
⁄32 2
13
⁄64
7
⁄16–14
29
⁄32 1
11
⁄16
JAB34 JAB34H
3
⁄4 19.0 1/0 Str. 8 Sol. 53.4 8.3 2 2
11
⁄32
7
⁄16–14
11
⁄16 1
51
⁄64
— JAB34C
3
⁄4 +
5
⁄8 15.8 to 19.0 4/0 Str. 8 Sol. 95.0 8.3 — 2
11
⁄32
7
⁄16–14 1
1
⁄8 1
1
⁄32
13
⁄16
JAB1 JAB1H 1 25.0 4/0 Str. 8 Sol. 107.1 8.3 2
1
⁄4 3
7
⁄16–14 1
11
⁄32 1
1
⁄16 1
* Not CSA listed
Add suffix P to Cat. No. for tin-plated clamp.
CAT. NO.
NOMINAL ROD DIA. WIRE RANGE DIMENSIONS (IN.)
(IN.) (MM) MAX. MIN. MAX. (MM
2
) MIN. (MM
2
) A (MAX.) BOLT B C D
JWR
3
⁄8*
1
⁄2
5
⁄8
3
⁄4
9.5
12.7
15.8
19.0
1/0 Str.
1/0 Str.
1/0 Str.
1/0 Str.
10 Sol.
10 Sol.
10 Sol.
8 Sol.
53.4
53.4
53.4
53.4
5.2
5.2
5.2
8.3
1.535
1.535
1.535
1.535
1.050
1.050
1.050
1.050
.812
.812
.812
.812
.652
.652
.652
.652
*
3
⁄8" rod not recognized/listed by UL.
UL
®
Listed for both copper-clad
and galvanized ground rods.
Type JWR — Wide-Range Ground Rod Clamp
• UL
®
Listed for direct burial in earth/concrete
• Constructed from bronze alloy and
high-performance stainless steel bolt
• Provides wide range of connection sizes
• More than 300 lbs. torque capacity
A
MAX.
B
C
TYPE JABH
B
C
A
MAX.
D
DB
DB
1211_1836_TNB_TNB_Power Connection & Control Cat31_r7.indd 25 2/24/14 3:27 PM