Insulated Tools & Live Cable Jointing
Published 19 Dec 2017
uploaded by Chris Dodds - Thorne & Derrick
In the UK the Distribution Network Operators permit appropriately accredited ICP’s to carry out live cable jointing onto service and mains connections on their low voltage electrical distribution systems – those cable jointers must be trained, assessed and authorised as competent to work on live cables with a professional working knowledge (practical and theoretical) of the electrical safety considerations when jointing energised cables.
Furthermore, contractors must use approved and tested insulated tools, jointing tools and electrical safety equipment to prevent workplace risk becoming workplace accident.
Insulated tools will protect workers against contact with live circuits and cables. Without them you could be risking serious injury, liability or even death.
Typical 400v low voltage cables jointed under live conditions are waveform, wavecon, PILC STA and Consac – live working is essential but not encouraged and suitable arc flash clothing should be worn when carrying out maintenance on energised substations, cables and electrical equipment. See the UK HSE HSG85 document for further information about safe working near dead or live electrical equipment.
The following series of site photographs kindly contributed by Billy Ayling, an authorised Live Cable Jointer, shows the stages of cable stripping, preparation, shrouding and branch jointing of wavecon cables. The photo’s were taken by the Jointers mate.
- Application: Live Cable Jointing
- Cable Joint Type: Breech/Branch Joint
- Cable Type: Wavecon Cables – 95sqmm 3 Core Wavecon Breeched
- Cable Jointer: Billy Ayling (Self Employed – DNO (SSE) Trained Live LV / 11kV Jointer
Billy has worked in the utility industry since leaving school in 2001 and has been a cable jointer since 2010. Professionally trained at SSE Thatcham Jointing School and authorised to fault find, repair and cable joint wavecon, consac, PILC SWA and associated services with additional skills including operating and linking on the low voltage electricity network.
Cable Jointing In The Danger Zone
With nerves of steel and the concentration powers of a chess Grandmaster a live cable jointer must maintain a steady hand and focussed mind when working on live cables.
Billy comments, “the main risk during live cable jointing is losing concentration – generally I would not speak to my Jointers mate whilst live working on cables unless something critical to the cable joint installation is required. All adjacent conductive metal work must be shrouded using rubber insulating shrouds UV stabilised suitable for outdoor and underground use in cable trenches. Only one phase should be worked on at a time.”
Typically, when working on Live LV Conductors insulating gloves should be used when working on, or in close proximity to cables – UK DNO’s such as Scottish Power Energy Networks (SPEN) according to their policy guideline Rubber Gloves For Electrical Purposes recommend jointers wear Class 1 insulated gloves (7.5kV) to the British Standard BS EN 60903 (2003).
Hand protection is vital as is the use of dielectric boots where there is a real risk to the cable jointer of electrical shock from either low voltage or high voltages – see insulating boots for further information on suitable PPE for jointers.
An 11kV Jointer
Billy has ascended the voltages and is currently a high voltage cable jointer authorised to work on 11kV polymeric (XLPE) and 11kV paper (PILC PICAS) insulated cables.
Insulated Tools & IEC 60900
Quality insulated tools should be tested to IEC 60900 – this standard controls hand tools for live working up to 1000 V a.c. and 1500 V d.c.
Look for the official 1000V symbol, this will ensure the tools protect workers against accidental or incidental contact with electricity voltages up to 1000V. Purchase a copy of IEC 60900 from the IEC webstore here.
T&D also distribute the complete range of Class 0, 1, 2, 3 and 4 ranges of insulating matting to provide protection to utility workers, substation workers and cable jointers working on low, medium and high voltage cables and power systems.
Thorne & Derrick
Specialist Electrical Distributor
LV ♦ MV ♦ HV
T&D distribute the most extensive range of LV, MV & HV Cable Joints & Terminations for repairing, jointing and connecting 11kV/33kV cables in underground cable trenches or substations, switchgear and transformers – the extensive range of cold shrink and heat shrink joints and terminations are supported by a complete range of cable jointing tools to enable the removal of sheath, insulation and screen from LV, MV & HV cables.
- HSG85 Electricity At Work UK HSE – Safe Working Practises Size: 284.73 KB
- Boddingtons – Cable Jointing Tools Size: 5.61 MB
- Tyco Connectivity – LV MV HV Joint Termination Connectors Fittings Size: 2.79 MB