• This equipment is specifically portable earthing for maintenance on electrostatic flue-gas precipitators in generating stations and local authorities wadte disposal units
• It has been designed to provide safe and sure clamping to the speical stubs which are fillet-welded into the appropriate positions on to the precipitate electrode frame in accordance with BS5135.

1. Scope
   The equipment provides portable earthing for maintenance in accordance with the CEGB Safely Rules and National Safety Code of Practice SR-EM 21.
2. Design and Construction
   Both Line end clamp and earth end clamp are designed with an ultimate strength well in excess of normal
   working loads and all designs are type tested at normal loading before being approved.
3. Equipment
   1. Line End Clamp
      This is designed to make positive line contact with the spherical stub no matter what the angle of application and it should be applied by means of the operating socket Fig 6 attached to the appropriate insulated operating pole.
   2. Earth End Clamp
      This should be applied by hand to the appropriate earth bar to the maximum torque possible without the use of mechanical aids.
   3. Operating Socket
      Made in light alloy and is fitted with an enclosed spring to give a positive hold to the conductor clamp when it is being applied.
   4. Operating Poles – Insulated
      These are limited in length to a maximum of 2440mm. There are two types:
      1. 1220mm long top section fitted with the appropriate socket, plus a 1220mm bottom section
      2. A 2440mm long telescopic pole also fitted with the appropriate socket but capable of closing down to 1220 mm for ease of transportation.
   5. Earth Leads
      Only cables by approved manufactures and fitted with approved compression lugs shall be supplied for the earthing lead connection between the conductor clamps and earth end clamps. The flexible conductor shall be stranded 312/0.45mm aluminium (50mm2 aluminium) with clear/green translucent PVC sheathing to an overall diameter of approximately 12.4mm.
4. Certification of clamps and cables
   All completed equipment i.e. conductor clamp, earth clamp and interconnection lead are to be subjected to a
   resistance test as appropriate.

• NOTE: All measurements below are in mm.

Stub ST/M.S/225/1

• Stub - Weld on type

Earth Clamp CE10/GS

• Max conductor 15.9mm (5/8")

Line End Clamp CE30

Ball Stub Bolt on

• Bolted type Ball Type Stub

T/Bar Stub

• Bolted type T/Bar Stub

Pole Sections

• (a) Top Section Pole
• (b) Bottom Section Extension Pole
• (c) Telescopic Pole