Scope
It is designed to be as light as possible, employing aluminium alloy clamps, aluminium earthing leads and glass fibre operating poles. These have been developed in conjunction with The National Grid Company Limited and are currently included in their Standard 43921 TPS 1/113 (Overhead Lines) and NSI 4 (Work on high voltage overhead lines).

Equipment

EARTH END CLAMP
Code CE10/A1
For direct application by hand to tower steelwork. The operating screw of this device has a captive hardened steel tip which penetrates through painted, weathered or non conductive surfaces and indents into the steelwork ensuring a strong efficient connection to earth.

EARTH END CLAMP
Code CE18/A (Bridging)
For earthing line conductor over tension set insulators to tower arm coupling during maintenance, bolts to coupling through clearance hole for arcing horn bolt which is removed prior to earthing.

LINE END CLAMP
Code CE52/A (Normal Type)
Intended to be applied only by means of an operating socket attached to an insulated operating pole in either an upward or downward direction. Spring loaded jaws enable the clamp to be slipped easily over the line conductor and retains the clamp in position whilst its operating screw is being tightened/loosened.

LINE END CLAMP
Code CE13/A (Angled Type)
As above but designed to be applied in near horizontal position from tower cross arm over tension set insulators in line conductor.

LINE END CLAMP
Code CE23/A (Running Earth)
Designed specifically for earthing line conductors during "Stringing" operations. Enables cable to run freely between contact roller faces whilst providing a positive contact earth.

CE61 (Deas Bar)
Developed by the National Grid Company as an earthing bar for use in the arcing horn bolt hole of the earth side insulator string arrangement, when lowering off tension set insulators.

CE60 (Sparrow Plate)
Multiple earth tower bonding plate designed for control of induced currents. Manufactured from aluminium alloy and provided with location for up to twelve portable drain earths fitted with PB50F ferrule type terminations. Also provided with bolted connections for up to four interconnecting earth leads. Six thumbscrews with (replaceable) hardened tips for effective bonding to the tower structure are also incorporated.

OPERATING SOCKET
Made from alloy material with internal spring loaded plunger which maintains grip pressure on the inserted operating screw, holding both screw and clamp rigid whilst being directed into position.

OPERATING POLES
Made in strong glass fibre material in accordance with C.E.G.B. Specification 43921. Supplied as single 8ft section complete with operating socket or as 8ft heavy duty telescopic extending to 16ft. with two intermediate positive stops. Lengths of the telescopic poles can be increased further by use of a single 6ft. extension pole, supplied when specified. Carrying slings for telescopic and extension poles can be supplied as optional extra.

EARTHING LEADS
Only cables from approved manufacturers and fitted with approved compression terminations and stress relieving sleeves are supplied for earthing leads.

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