Cable Joints & Terminations HV

Slaters Electricals | UK’s Largest Stock of New & Refurbished Power Distribution Equipment

Since 1923.

• uploaded by Chris Dodds | Thorne & Derrick Sales/Marketing Manager

Slaters Electrical are experts in the provision of LV MV HV Power, Distribution & Cast Resin Transformers, Switchgear, Installation, Maintenance, Site Services & Spares.

The Slaters Electricals installation division primarily operates from a dedicated base in Sheffield, with additional skilled engineers based at their Head Office and main works in Newcastle upon Tyne.

From these two sites Slaters Electricals offers a range of HV MV and LV installation and cable work services covering the whole of the UK.

➡ Contact t: 44 (0)191 414 2916 e: [email protected]

Switchgear & Transformers

MV HV Medium & High Voltage Power

The following photographs are published with the kind permission of Slaters Electricals and demonstrate their leading technical skills, knowledge and expertise in providing turnkey Medium & High Voltage Power Distribution solutions.

• 2no New 2000kVA 11kV/433V Midel Filled Tier 1 Distribution Transformers + LV Boxes to accommodate Schneider Canalis Busbar Trunking System
• New 7 Section Schneider Ringmaster Switchboard consisting of 5no 630A CE6-T4/21 & 2no 200A CE2-T2/21 Circuit Breakers
• 30V Battery Tripping Unit
• HV Cable Works & Cable Containment

All MV HV Power Distribution Switchgear & Transformers are checked, refurbished and tested by skilled time-served engineers prior to delivery.

• 11kV/110V AC Voltage Transformer fixed and moving portions for GEC VMX Switchgear despatched to a UK DNO on a same-day turnaround following a catastrophic failure in a distribution network Substation. Slaters Electricals provide a rapid-response to emergency power restoration enabled by extensive stocks of legacy and current technology switchgear and transformer spare parts at their 100,000 square foot facility.

Emergency deliveries of Power Distribution & Switchgear are achieved nationwide supported by the largest UK spares stocks and same day “load and run” delivery fleet.

• 2no refurbished Schneider GenieEvo VC2 200A Circuit Breakers after completing tests at Slaters Electricals – the range of refurbished switchgear stock includes most current production types including Schneider GenieEvo & Ringmaster, Hawker Siddeley/Brush Eclipse, ABB UniGear & ABB SafePlus as well as the widest available range of legacy UK manufactured types including Alstom, Brush, GEC, Long & Crawford, Reyrolle, South Wales, Yorkshire etc. Whether you need a spare part, a single extension panel or a full replacement switchboard, you can contact their Sales Engineers.

• New 2000kVA 11kV/433V Tier 1 Distribution Transformer complete with close coupled Schneider CN2-T1 200A Circuit Breaker and refurbished 3200A ABB SACE ACB Feeder Cabinet, contained within a custom fabricated tranformer bund. Slaters Electricals site services division attends site to complete MV HV & LV cable works and containment plus  installation-commissioning as part of a full supply and install MV Power Distribution solution including GRP enclosure and battery tripping unit.

2.5MVA 11000/433V Dyn11 Cast Resin MV Medium Voltage Transformers

2500kVA 11kV/433V Tier 1 Distribution Transformer

Fully Refurbished 11kV Eclipse 20ft Containerised Switchboard | Hire Options

THORNE & DERRICK

Thorne & Derrick are national distributors of LV, MV & HV Cable Installation, Jointing, Substation & Electrical Equipment – servicing businesses involved in cabling, jointing, substation, earthing, overhead line and electrical construction at LV, 11kV, 33kV, 66kV and EHV. Supplying a complete range of power cable accessories to support the installation and maintenance of low/medium and high voltage voltage power systems:

• Slip-on Cable Terminations
• Cold-shrink Cable Terminations
• Heat-shrink Cable Terminations
• Cable Joints – Heat & Cold-shrink
• Separable Connectors (Euromold)
• Surge Arresters & Switchgear/Transformer Bushings

Key Product Categories: Duct Seals | Cable Cleats | Cable Glands | Electrical Safety | Arc Flash Protection | Cable Jointing Tools | Cable Pulling | Earthing | Feeder Pillars | Cable Joints LV | Joints & Terminations MV HV 

Pioneering Safety in Onshore & Offshore Wind: First Graduates of New GWO High Voltage Cable Pulling Standard

The Wind Academy

The Wind Academy, the UK leading facility delivering GWO and Technical Trade Training Courses, has marked a major milestone in onshore and offshore wind technician training with the successful delivery of the first-ever GWO High Voltage Cable Pulling (HVCP) Training Standard.

Hosted at their brand-new Training Facility at the Port of Blyth, this pilot programme has produced some of the very first professionals in the world to gain certification under this innovative new standard — developed by the Global Wind Organisation (GWO) to boost safety, reduce cable damage, and improve operational uptime across the wind sector.

What is the HVCP Module?

The HVCP module forms part of the new GWO High Voltage Training Standard and equips participants with the skills, safety awareness and confidence to carry out high voltage cable installation both onshore and offshore.

Aimed at commissioning and service technicians, this standard supports work in HV operations or cable pulling under a Safe System of Work (SSOW). The HV Standard has been highly requested by many of the leading members of the Global Wind Organisation with input from Cubico Sustainable Investments, ENERCON, ENGIE, GE Vernova, Nordex Group, Northland Power Inc., Ørsted, RWE, Siemens Gamesa, SSE Renewables and Vestas.

Why This Matters for the Industry

By standardising HV cable pulling procedures and ensuring rigorous training, the new GWO HVCP standard helps:

• Prevent costly cable damage during installation

• Protect worker safety in challenging offshore conditions

• Maintain uptime and reliability of wind farm assets

HV Jointer Training at the Wind Academy

The Wind Academy also provides brand-specific Cable Termination Courses for leading cable accessory manufacturers including Nexans (Euromold), Pfisterer (Connex), 3M Electrical, and NKT.

Thorne & Derrick

Leading Specialist Electrical Distributor to the Global Renewable Energy Industry

Thorne & Derrick supply High Voltage Cable Accessories, Jointing Tools & Power Distribution Equipment up to 66kV – we hold several Framework Supply Agreements with international energy providers, OEM’s and High Voltage Power Energy Companies.

From the largest stocks in the UK & EU we supply global projects with HV Cable Accessories to energise projects – this includes Nexans Euromold, Pfisterer Connex & 3M Cold Shrink Separable Connectors, Joints & Terminations at 11kV/33kV/66kV.

This is complemented by the most extensive stocks of Cable Preparation, Cutting, Crimping & Spiking Tools for insulation, screen, sheath removal of MV & HV cables including Alroc, Ripley, Hivotec, Cembre, Klauke, Boddingtons and PENTA.

Supplying Cable Termination, Jointing, Pull-in & Electrical Equipment up to 66kV

Cold Shrink Glands for MV HV Cables

How to Install SPS 180 & SPS 193 Cold Shrink Cable Glands

To suit 3 Core SWA Armoured XLPE Cables, 3.6kV (3.3kV) to 36kV (33kV)

Reference Numbers: SPS 180(CS) and SPS 193(CS)

In this Post, we present a step-by-step installation guide for the SPS 180(CS) and SPS 193(CS) Cold Shrink ‘Bolt-On’ Type Cable Glands. These “top-hat” glands are designed to connect and gland 3-core armoured XLPE cables from 3.6kV to 36kV, providing a reliable and easy-to-install solution for Cold Shrink termination and are distributed by Thorne & Derrick.

Note:- Fig 1 shows one possible cable gland configuration, in some situations it may be necessary to position the 3 leg heat shrink boot body below the gland plate to gain space within the cable box. If cable is non armoured, additional strain may be put on the heat shrink tube to ensure cable is supported by cable cleats to provide additional strain relief.

Step-by-Step Installation Guide

1. Cable Preparation

• Before opening up the armour wires, ensure the cold shrink tubes and the two worm drive clamps are in position.

2. Armour Wires

• Open up the wire armours as shown in Fig 2.

3. Cable Gland Body

• Slide the metal cable gland body over the cable.

  Note: The cable gland body itself can, in most cases, be positioned after completing the cable termination.

  For Steel Tape Armoured Cable:
  Prepare to the same dimensions shown in Fig 1 and follow section 7 (see below).

  Configuration Tip:
  Fig 1 shows one possible configuration. In some cases, you may need to position the 3-leg boot body below the gland plate to gain space within the cable box.

  Non-Armoured Cable Warning:
  Additional strain may be placed on the shrink tube. Ensure the cable is supported by cable cleats to provide strain relief.

4. Final Connections

• Complete the final connections of the cable termination before bolting the cable gland body in place.

5. Bend Armour Back

• Bend the armours back over the cable gland body.

6. Clamping

• Using the worm drive clamps, connect the cable armours and screen earth braids to the cable gland body as shown in Fig 3. Ensure the cable clamps are tight.

7. Cover Edges

• Cover any sharp edges and the clamp buckles with PVC tape.

  If Steel Tape Armoured:
  Unwind the electrical tape below the bottom of the cable gland, re-wrap around the cable gland body, and secure with worm drive clamps.

8. Moisture Seal

• To provide a moisture seal, stretch and apply a turn of grey mastic tape around:

  • The top of the metal cable gland body.

  • The outer cable jacket.

This ensures that the cold shrink tube will recover properly onto the tape.

9. Apply Cold Shrink

• Position the cold shrink tube.

• Begin pulling the plastic spiral carefully.

  • Do not pull the spiral straight.

  • Wrap it around the cable to avoid snagging.

10. Secure Ends

• Once fitted, apply the provided black EPR tape at both the top and bottom of the tube.

Figures for Reference

• Fig 1: Base plate and initial configuration

• Fig 2: Wire armour open-up

• Fig 3: Clamp setup with screen earth braid

• Fig 4: Final assembly with cold shrink and sealing tapes

Cable Glands Distributed from Stock by Thorne & Derrick | the 501/453 range of Universal Cable Glands manufactured by Hawke are suitable for the mechanical retention, glanding and termination of LV MV HV Power Cables with steel wire armour, steel wire braid or steel tape armour.

Shrink Polymer Systems heatshrink cable joints and terminations suit all types of MV-HV electrical cables (single or multi-core) with or without armour or lead sheaths – zero halogen and fire resistant cable joints are also available.

Interface F Bushings & High Voltage Power Cable Connectors

Author | Rialdo Suwandi

Founder at Aldora Electric | Expert in Renewable Electrical Engineering & Cable Systems | Problem Solver | FIEAust CPEng NER

HV Bushings & Connectors

What Are Interface F Bushings?

How Do To Select the Right Cable Connector?

As medium voltage (MV) power systems grow in scale and capacity, manufacturers have introduced electrical equipment, such as transformers and switchgear, capable of handling up to 1250A at 52kV and 2500A at 36kV.

To ensure interoperability across manufacturers, these Interfaces are standardised under EN 50180 and EN 50181 as Interface F Bushings.

Furthermore, EN 50673 standardises 630A and 1250A bushings at 72.5kV.

What Are Interface F Bushings Used For?

Interface F bushings are typically used to connect gas-insulated switchgear (GIS) and transformers to cable circuits using separable connectors distributing electrical power at 11kV, 33kV and up to 66kV – manufactured by Nexans Euromold the connectors are suitable for cable termination of polymeric (XLPE EPR) insulated cables with copper wire or copper tape screen, wire armoured (SWA/AWA), wire braided or unarmoured cables into MV-HV Electrical Equipment with Interface F bushings.

Advantages of Electrical Equipment Bushings 

• Compact switchgear and transformer designs
• Interoperability across different manufacturers

Types of Interface F Bushings

As defined in EN 50180 and EN 50181:

F1 Bushings: Um ≤ 36 kV; Ir = 2500 A
F2 Bushings: Um ≤ 52 kV; Ir = 630 A
F3 Bushings: Um ≤ 52 kV; Ir = 1250 A

For 72.5kV high voltage power systems, EN 50673 defines the following:
F4 Bushings: Um = 72.5 kV; Ir = 630 A
F5 Bushings: Um = 72.5 kV; Ir = 1250 A

Note: F5 interfaces are commonly used in offshore wind applications but can adopted for large onshore installations as well.

Pictured | Nexans Q900AR-1Q900AR-2 Interface F Equipment Bushing 52kV MV HV

How to Select the Right High Voltage Separable Connector for Interface F Bushings

To ensure proper fit and reliable performance the following information must be established:

Interface type? e.g. F1
Maximum system voltage? e.g. Um = 36kV
Cable insulation type? e.g. XLPE
Conductor material and cross-section? e.g. copper, 800sqmm
Insulation over-diameter? e.g. 52.8mm
Number of circuits per phase? e.g. 2 circuits
Are surge arresters required? Confirm via an insulation coordination study

Interface F bushings enable safe, standardised, and high-capacity MV cable connections to GIS, and transformers, both for on-shore and off-shore applications.

Selecting the correct separable connector Interface F Connector —matched to interface type, voltage, current, cable type, and system design—ensures long-term reliability, safety, and maintainability.

Definitions of International Electrical Standards

EN 50180 | This European Standard is applicable to ceramic and resin insulated bushings having highest voltages above 1kV up to 52kV, rated currents from 250A up to 3150 A and frequencies from 15 Hz up to 60 Hz for insulating liquid filled transformers. This European Standard establishes essential dimensions, to ensure interchangeability of bushings and to ensure adequate mounting and interchangeability of mating plug-in separable connectors of equivalent ratings.

EN 50181 | This European Standard is applicable to insulated bushings for maximum voltages above 1kV up to 52kV, rated currents from 250A up to 2 500A and frequencies from 15 Hz up to 60 Hz for equipment other than liquid filled transformers. This European Standard establishes essential dimensions, to ensure adequate mounting and interchangeability of mating plug-in separable connectors of equivalent ratings.

EN 50673 | Extend the scope of the EN50180-1/2/3 and EN50181 for plug-in type bushings up to 72.5 kV

Thorne & Derrick distribute the most extensive range of MV HV Medium & High Voltage Cable Joints, Terminations & Connectors from manufacturers including 3M, Prysmian, Nexans Euromold, Elastimold, Pfisterer CONNEX & SEANEX and Shrink Polymer Systems.

Lovink Cable Joints & Network Resilience at 11kV & 33kV

Cable Jointing Solutions

Network resilience requires advanced technology solutions manufactured from highest performance materials; if high harmonics, Sine wave distortion, AD8 protection, abnormal thermal cycling, high-water table, ALE of legacy PILC or general cable failure prevention to critical 11/33kV circuits matters to you, then talk to us.

Where cables undergo dynamic cyclical load in high harmonic and non-linear load applications the Lovink range of cable joints demonstrate years of fault-free field performance in high temperature installations – additionally, the cable joints are “flame-free” and therefore safe for installation in potentially explosive atmospheres as no heating source or naked flame is required for the installation.

Resin encapsulation provides the highest levels of mechanical impact protection and electrical insulation eliminating voids, discharges and ionisation within the cable joint – the seawater resistant resin and “wet area” (2 bar at 20m water head) performance counters premature electrical cable joint failures in the renewable sector where damp soil conditions, flooded duct and water immersion can induce premature service failure to jointing solutions utilising other technologies.

The compact design permits reduced size joint holes reducing excavation and associated civil engineering preparation costs – ideal for confined space applications where volume displacement is a factor and close quarter working necessitates a compact profile solution.

Thank you to Stephen Davies (Lovink Enertech Account Manager) for todays emphatic Presentation and roundtable with our incredible Team.

Lovink Cable Joints

For straight, transition and branch connections of MV Power Cables – this includes 11kV and 33kV paper-insulated (PILC/PICAS) and polymeric (XLPE/EPR) cables up to 1000sqmm.

Lovink Cable Joints