This document provides specifications for various portable earthing clamps and equipment for substations. It describes 7 different clamps - the CE16/5.5/ESI-L5, CE25, CE50, CE51, CE57, and ESI-T1. For each clamp, it provides details on intended applications, dimensions for tube/conductor diameters, number of leads that can be attached, and amperage and time tested. It also includes diagrams of some clamps and specifications for earth tapes the CE57 clamp can be used with.

1. CE16/5.5/ESI -L5
Fig. 9 CE16/5.5/ESI-L5
For application to aluminium tube 140mm diameter only.
Provisions for attachment of three flexible leads as in Fig.13
Tested to 50kA for 3 secs.
CE25
Fig. 10 Code CE25 Line End Clamp (Mechanical Aid)
Designed specifically for use with mechanical aids to the application of portable
earths and to permit the raising of two earthing leads.
For application to clean or dirty copper or aluminium tube.
Maximum diameter 75mm
Minimum diameter 35mm
Provision for attachment of two flexible leads as in Fig.13
NOTE: For attachment the operating pole should be rotated with normal firm hand
pressure until a definite resistance to further movement is experienced.
Tested to 38 kA for 2 secs.
CE50&CE51
Fig. 11 CE50 & CE51
CE50 for application to aluminium tube 190 to 200mm diameter and
CE51 for application to clean or dirty aluminium tube 140 to 160mm
diameter.
Provision for attachment of two flexible leads as in Fig, 13.
Tested to 38kA for 2 secs.
Clamp X Y Z
CE50 269 348 493
CE51 240 310 455
CE57
Fig. 12 CE57 Earth Tape Clamp
For application to damaged aluminium or copper earth tapes in a
clean or dirty condition, ranging from 25 x 3mm to 100 x 6mm.
Providing a drain earth before fitting a bridging earth suitable for
fault protection.
All sizes are in Millimetres
SECTION 1 Portable Earthing Equipment For Sub-Stations
THORNE AND DERRICK UK – LEAK DETECTION
TEL: 0044 (0)191 490 1547 FAX: 0044 (0)191 477 5371
TEL: 0044 (0)117 977 4647 FAX: 0044 (0)117 477 5582
WWW.HEATTRACING.CO.UK
WWW.THORNEANDDERRICK.CO.UK
e-mail: northernsales@thorneandderrick.co.uk
Cable Ends (3)
Max width = 133
197
262
Cable Ends
Max. width = 133 (5.25”)
368
238 (9.375”)
X
Z max
Max width = 133 Y
ESI – T1(x2)
272 - max
M10 screws
19 145 - max
45
Conductor Range
100 x 6 max
25 x 3 max
229(9”)
P & B WE I R E A R T H I N G E Q U I PME N T C ATA L O G U E 2 0 0 0 5