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]
28
Connectors & Grounding — Blackburn
®
Grounding Systems
Structure Grounding
Bolt features square shank
to prevent turning and enable
clamp to be tightened with
a single wrench.
Type GTC — Tower Ground Clamps
• Castings of high-strength, corrosion-resistant copper alloy
• GTC23 and GTC24 are two-piece clamps for
connecting ground lead cable to flat metal surface —
ideal for grounding substations on tower footings
• GTC13 and GTC14 are economical one-piece clamps,
which perform the same function as two-piece clamps,
except under-pad support is omitted and conductor
connects directly to tower
• Add suffix L to catalog number for
1
⁄2" channel thickness
CAT.
NO.
CONDUCTOR RANGE
CHANNEL
THICKNESS
DIMENSION (IN.)
MAX. MIN.
MAX.
(MM
2
)
MIN.
(MM
2
) A B D E G H R
GTC13 2/0 Str. #4 Sol. 67.4 21.1
1
⁄4 1
15
⁄32 —
9
⁄16 1
21
⁄32
13
⁄32
3
⁄8
7
⁄32
GTC14 250 kcmil 2/0 Str. 126.6 67.4
1
⁄4 1
15
⁄16 —
3
⁄4 1
15
⁄16 1
13
⁄32
1
⁄2
5
⁄16
GTC23 2/0 Str. #4 Sol. 67.4 21.1
1
⁄4 1
41
⁄64
7
⁄16
9
⁄16 1
21
⁄32 1
3
⁄32
3
⁄8 —
GTC24 250 kcmil 2/0 Str. 126.6 21.1
1
⁄4 1
61
⁄64
5
⁄8
3
⁄4 1
15
⁄16 1
3
⁄8
1
⁄2 —
3
⁄8" Nut
Split Washer
Flat Washer
3
⁄8" Bolt with Ribbed
neck and Phillips
recessed head
CAT. NO. WIDE RANGE (2 SIDES) HEIGHT WIDTH DEPTH NUT (FLATS)
CTG250 #2 Sol. (.258 Dia.) 250 kcmil (.575 Dia.) 1.95 2.00 1.13 .560
Tin-plate body
Galvanized hardware
Type GTC 13 and 14
A G
E
R
D
H
Type GTC 23 and 24
A
G
E
H
D
B
For use with aluminum
or copper conductors.
CTG250 Wide-Range Tower
Ground Clamp
• May be used in aluminum or galvanized-steel
cable tray
• Ribbed neck on the bolt prevents rotation
during tightening if .440" dia. hole is used
1211_1836_TNB_TNB_Power Connection & Control Cat31_r7.indd 28 2/24/14 3:27 PM