PBSI Group - Weir Electrical


The SPIGOT is P&B Weirs' new earthing clamp for substation and transmission earthing applications.

The SPIGOT is a connection method that allows small (and lighter) earthing clamps to be fitted to large diameter conductors.

The SPIGOT is intended to be fitted to large conductors and provides the system with a prepared connection point for the purposes of temporary earthing.

Previous methodology would mean that a large conductor would require a large clamp. However in many instances this is simply to heavy to manually lift up towards the bus bar or line in order to secure it.

The SPIGOT provides a small diameter shaft where multiple clamps can be fitted, this has several key benefits:

  • as multiple clamps are fitted, there is an inherent higher factor of safety for single clamp failure.

  • mutiple clamps can be fitted as appropriate to the fault rating of the primary conductor

  • individual clamps are lighter and easier to connect to the SPIGOT arm.

  • The spigot itself provides a prepared and permant connection point for earthing.

National Grid Registered 400kV Earth Spigot EGI Code: BC4P0001

The Spigot is an aluminium clamp and spigot system designed to be permanently fitted to new or existing substation busbars.   It accommodates up to five P & B Weir Electrical line end clamps suitable for 38mm diameter busbars, reducing the need to use the heavier 115mm to 250mm range of clamps.

The Suspended Earthing Spigot is designed to be installed easily, either during the initial erection of a new substation busbar system or subsequently, as an enhancement to an existing system.   It comprises a range of three clamps machined to fit any of the busbar sizes currently used in substations throughout the UK, from 115mm to 250mm diameter.

The appropriately machined clamp is supplied in two halves that are bolted together around the busbar using the supplied fasteners that are tightened to prescribed torque settings.   Its light weight makes it possible for one person to install.   A 38mm diameter spigot and corona shield, common to all spigot clamps and busbar sizes, is then bolted onto the clamp.   This is positioned horizontally to cater for busbars at any angle from horizontal to 60º, before tightening to a prescribed torque setting.

The Suspended Earthing Spigot fully conforms to the requirements of the UK Electricity Supply Industry and has successfully completed:

♦   1kN mechanical loading trials

♦   Continuous current test at 900Amps

♦   RIV and corona discharge tests

♦   Short circuit current test at 80kA for 1 second including a peak at 200kA

♦   Short circuit current test at 40kA for 3 seconds including a peak at 100kA

Product Benefits

♦   Simple to install

♦   Suitable for new build or substation upgrades

♦   Lightweight

♦   Fully tested

♦   No accessories required

♦   Improves manual handling

♦   Reduces earth clamp size

♦   Reduces outage time

Product Dimensions

♦   Height:   530-590mm

♦   Width:     900mm

♦   Depth:    260-380mm

♦   Clamp:   5-7Kg

♦   Spigot:    3Kg

The SPIGOT testing was witnessed and is approved use by the United Kingdoms National Electricity Transmission Network, National Grid http://www.nationalgrid.com/uk/

Click Here to view our Spigot Leaflet

View the video of a successful short circuit level test, conducted at a high voltage test laboratory.

 If you require specific information on any of our products, please do not hesitate to e-mail us at  weir@pbsigroup.com and we will get back to you!