Separable Connectors To Terminate Cables Into MV Switchgear
Uploaded By:Â Chris Dodds Thorne & Derrick Sales & Marketing Manager
The following article confirms the current types and manufacturers brands of Separable Connectors that are approved to terminate medium/high voltage cables (11kV/12kV up to 24kV) into Ring Main Unit switchgear for application with Eaton Xiria 12kV/24kV medium voltage distribution networks.
Separable connectors manufactured by Nexans Euromold are moulded from high quality EPDM rubber, fully insulated and sealed, widely installed onto medium/high voltage pad-mounted switchgear, transformers, sectionalising cabinets and used to terminate MV cables into switchgear up to 24kV.
The MV switchgear manufactured by Eaton is provided with epoxy resin cable bushings or cones according to EN 50181 – the following types of separable connectors are manufacturer approved and compatible with their switchgear.
| MV Panel Type | Switchgear Bushing Cone | I [A] | Maximum Short-Circuit Current | Cable Connector | MV Cable |
| Load Break Switch | Interface C | 630A | 17.5-24kV 16kA-1 & 3s | Bolted T-Plug | Cu/Al XLPE |
| 3.6-12kV 20kA-1 & 3s | |||||
| Circuit Breaker | Interface A | 200A | 17.5-24kV 16kA-0.6s | Elbow Type Plug | Cu/Al XLPE |
| 3.6-12kV 20kA-0.4s | |||||
| Circuit Breaker | Interface C | 500A | 17.5-24kV 16kA-1 & 3s | Bolted T-Plug | Cu/Al XLPE |
| 3.6-12kV 20kA-1 & 3s |
Interface A Circuit-breaker 200A including current transformers
Interface C Circuit-breaker 500A including current transformers
Interface C Load-break switch 630A without current transformers
Cable connectors are not included with the switchgear and should be ordered seperately.
For 24kV connections separable connectors with an earthed layer on the outside must be used, for 12kV connections connectors without an earthed layer might be used also.
Both types of separable connectors may not exceed certain dimensions to avoid incompatibility of the MV connector with the switchgear panel.
The interface bushings or switchgear cones in the Eaton medium voltage system are according to EN 50181. They can be of the Interface A (250A design, panel rating 200A) and Interface C (630A).
For connection of MV-HV cables into air insulated equipment or cable-end boxes we can provide a complete range of heat shrink cable terminations or for working on switchgear located in potentially explosive atmospheres such as offshore oil and gas platforms where it is not possible to use heat shrink type kits a cold shrink termination can be provided.
Full supporting range of MV-HV cable connectors to enable the termination and connection of copper or aluminium conductors onto busbar are available also from stock.
As an example some possible brands are shown here including Nexans Euromold connectors:
Euromold Type K158LR Xiria Circuit Breaker Outer Cone Type Interface A 200A Bushing
Euromold Type K430TB Xiria Circuit Breaker Outer Cone Interface Type C 500A Bushing
Tyco Type RSES Xiria Circuit Breaker Outer Cone Inerface Type A 200A Bushing
Tyco Type RSTI58 Xiria Load Break Switch Outer Cone Interface Type C 630A Bushing
Euromold Type K400TB Xiria Load Break Switch Outer Cone Interface Type C 630A Bushing
Tyco RSTICC58 Xiria Circuit Breaker Outer Cone Interface Type C 500A Bushing with double cable for metering (one primary cable and one cable for a voltage transformer)
Tyco Type RICS Xiria Load Break Switch Outer Cone Interface Type C 630A Bushing
The Euromold range of Separable Connectors are suitable for the termination of power cables onto all MV-HV bushing interfaces:
 |
 |
 |
 |
 |
 |
View the complete range of Nexans Terminations | Joints | Connectors
THORNE & DERRICK are national distributors LV, MV & HV Cable Installation, Jointing, Substation & Electrical Equipment – we service UK and global businesses involved in cable installations, cable jointing, substation, overhead line and electrical construction at LV, 11kV, 33kV and EHV.
Since 1985, T&D have established an international reputation based on SERVICE | INTEGRITY | TRUST.
Contact us for 3M Electrical, ABB, Alroc, AN Wallis, CATU Electrical, Cembre, Centriforce, CMP, CSD, Elastimold, Ellis Patents, Emtelle, Euromold, Filoform , Furse, Lucy Electric & Zodion, Nexans, Pfisterer, Polypipe, Prysmian, Roxtec, Sicame, WT Henley.
Thorne & Derrick invite you to join LinkedIn’s largest LV-HV Electrical Discussion Group : Low & High Voltage Power, Cabling, Jointing & Electricals. Discussion subjects include cable installations, earthing, cable jointing, substation, overhead line and electrical construction at LV, 11kV, 33kV and EHV. Network, engage and promote your profile, company or products with over 10,000 influencers.
Since 1985 Thorne & Derrick based in the UK have been specialist distributors of LV, MV & HV Cable Installation, Jointing, Substation, Arc Flash Clothing & Electrical Safety Equipment – customers include UK and worldwide contractors, specifiers, traders and end-users involved in medium and high voltage cable installations, cable jointing, substation, overhead line and electrical construction.
We are specialist stockists and distributors of 11kV-33kV Cable Joints, Terminations & Connectors from manufacturers including 3M, Pfisterer, Prysmian and Nexans Euromold in a selection of cable jointing technologies including push-on, heat shrink and cold shrink joints and cold shrink terminations.
♦ 132kV Surge Arresters | 132kV Link Box Stockists
MV HV | Medium & High Voltage Power Products, Tools, Cables & Electrical Equipment
by Chris Dodds T&D - estimated reading time 3 minutes
Wildlife induced power outages are increasingly caused by the invasion of rats and rodents into medium/high voltage electricity substations via unsealed and inadequately sealed cable ducts and then gnawing electricity power cables.
Filoform FiloSeal+HD is a duct sealing system that is able to seal large heavy armoured power (multicore XLPE SWA) and high voltage cables in ducts, bore holes or cable transit frames – providing a strong support system using hexagonal tubes building a re-enterable seal with honeycomb structure.
The duct seal system is extensively approved and used by UK utilities, DNO’s and their preferred ICP (Independent Connection Provider) to protect electrical assets and cables within substations typically operating at 11kV, 33kV, 66kV and up to 132kV from rat attack.
The cable duct seal kits have been extensively tested against pressure, pulling forces, chemicals, gases and hydrocarbons for adequate sealing of LV-HV cables against the danger of flood (water ingress) or gas migration.
Recently, testing was carried out to establish the ability of the duct seal system to resist, repel or prevent rat attack through cable ducts into electricity substations and the following post provides information about the test and their conclusions.
TalkTalk suffered a major outage caused by rodent damage to fibre optic cables in 2017.
Sealing Cables & Ducts
Filoform have carried out tests to assess the physical damage caused to the FiloSeal+HD cable sealing sealant by a group of four rats (two males and two females) which are given free access to the duct seal for a period of four weeks.
The FiloSeal+HD comprises of MD+ sealant with hexagonal tubes as the backing product which was positioned within a metal tube.
Each end of the tube was sealed with 25mm of MD+ sealant ensuring that access to the backing product could only be achieved by significant damage to the MD+ sealant.
This tube was mounted in the center of the cage and consequently, the male and female sides of the cage had access to opposite ends of the tube.
Test cage before start of study
 Immediately before rats placed in cage – side exposed to males |
 Immediately before rats placed in cage – side exposed to females |
 After one week of exposure – side exposed to males |
 After one week of exposure – side exposed to females |
 After four weeks of exposure – side exposed to males |
 After four weeks of exposure – side exposed to females |
Duct Seals | Substations
Conclusion
The results at the end of the four week study indicated that there was no apparent difference in the damage caused by the male rats in comparison to the female rats and though the damage increased over the duration of the study the MD+ duct sealant was not penetrated by the rats and the hexagonal backing tubes were not exposed or damaged.
No abnormalities, ill health or behavioural changes occurred to the rats during the study and all four rats achieved satisfactory body weight gain during the exposure period.
Several hard red pieces were observed in the large intestines of one female and in the stomach of one male and one female. There were no other abnormalities observed at the post mortem macroscopic examination at study termination on Day 29.
In conclusion as the hexagonal tubes were not damaged after 4 weeks of exposure with direct access, therefore, it is reasonable to assume that different backing products will be protected to a similar degree, when enclosed by MD+ cable duct sealant.
THORNE & DERRICK are national distributors LV, MV & HV Cable Installation, Jointing, Substation & Electrical Equipment – we service UK and global businesses involved in cable installations, cable jointing, substation, overhead line and electrical construction at LV, 11kV, 33kV and EHV.
Since 1985, T&D have established an international reputation based on SERVICE | INTEGRITY | TRUST.
Contact us for 3M Electrical, ABB, Alroc, AN Wallis, CATU Electrical, Cembre, Centriforce, CMP, CSD, Elastimold, Ellis Patents, Emtelle, Euromold, Filoform , Furse, Lucy Electric & Zodion, Nexans, Pfisterer, Polypipe, Prysmian, Roxtec, Sicame, WT Henley.
Thorne & Derrick invite you to join LinkedIn’s largest LV-HV Electrical Discussion Group : Low & High Voltage Power, Cabling, Jointing & Electricals. Discussion subjects include cable installations, cable jointing, substation, overhead line and electrical construction at LV, 11kV, 33kV and EHV. Network, engage and promote your profile, company or products with over 10,000 influencers.
More info: Euromold Screened Separable Connectors
Nexans Euromold 480TB type MV separable connectors are used to terminate MV-HV XLPE/EPR (polymeric) insulated cables up to 42kV into Interface C Bushings.
Nexan’s 480TB tee connector with 630A – 1250A current rating is designed for Interface C and covers voltages from 12kV to 42kV with a maximum conductor size of 300sqmm.
Nexans separable connectors are typically used to terminate cables on power systems and circuits distributing MV-HV electricity at 6.6kV, 11kV, 33kV and 66kVÂ according to CENELEC EN50180 and IEEE ANSI – in the site photographs below the 33kV single core cables (185sqmm) with XLPE insulation and copper wire screens are shown prepared and awaiting connection of the Euromold connectors. The copper wire screens are oversleeved with green/yellow insulation and bonded to earth point.
Once installed the high voltage cable terminations were subjected to and passed VLF, Tan Delta and PD tests.
The Euromold range of Separable Connectors are suitable for the termination of power cables onto all MV-HV bushing interfaces:
|
|
|
|
|
|
View the complete range of Nexans Terminations | Joints | Connectors
LVÂ ♦ MVÂ ♦ HV
T&D distribute the most extensive range of LV, MV & HV Cable Jointing, Terminating, Installation & Cable Pulling Equipment – we service UK and international clients working on underground cables, overhead lines, substations and electrical construction at LV, 11kV, 33kV and EHV transmission and distribution voltages.
LV – Low Voltage Cable Joints, Glands, Cleats, Lugs & Accessories (1000 Volts)
MV HV – Medium & High Voltage Cable Joints, Terminations & Connectors (11kV 33kV EHV)
Cable Laying – Underground Cable Covers, Ducting, Seals & Cable Pulling Equipment
T&D’s Power Blog covers: LV MV HV & EHV Transmission & Distribution, Substations, Switchgear, Cable Jointing & Termination, Cable Fault & Repair, Underground Cables
âž¡ Visit Power Blog
by Chris Dodds T&D - estimated reading time 3 minutes
Lucy Fused LV Distribution Cabinet
The Lucy Electric AcuLok TMO range of transformer mounted low voltage distribution cabinets incorporates the unique AcuLok fuse handle system – improving reliability and operator safety levels.
The LV cabinet is suitable for outdoor applications or indoor as part of a unit substation, the high equipment specification includes current transformers for load monitoring, a programmable digital meter, integral 660A Veam Powerlock generator sockets and an RCD protected auxiliary socket.
T&D UK distribute an extensive range of low voltage utility waveform power cables including cable joints, cable cleats, cable glands and accessories required to lay and install waveform cables to BS7870.
T&D distribute the most extensive range of MV & HV Cable Joints & Terminations, Cable Installation Accessories & Cable Pulling Equipment – we service UK and international clients working on underground cables, overhead lines, substation earthing and electrical construction at LV, 11kV, 33kV and EHV transmission and distribution voltages.
LV – Low Voltage Cable Joints, Glands, Cleats, Lugs & Accessories (1000 Volts)
MV HV – Medium & High Voltage Cable Joints, Terminations & Connectors (11kV 33kV EHV)
Cable Laying – Underground Cable Covers, Ducting, Seals & Cable Pulling Equipment
T&D’s Power Blog covers: LV MV HV & EHV Transmission & Distribution, Substations, Switchgear, Cable Jointing & Termination, Cable Fault & Repair, Underground Cables.
âž¡ Visit Power Blog.
Published 02 Sep 2026
Celebrating Charlie & Ella’s Level 4 Sales Executive Apprenticeships At Thorne & Derrick International, we are proud to champion talent development and recognise the dedication required to achieve professional growth. We are therefore delighted to congratulate Charlie Baines and...
Published 11 Aug 2026
Thorne & Derrick will be Exhibiting at Solar & Storage Live UK 2026 at the NEC Birmingham from 22nd–24th September, showcasing our support for HV Cable Accessories, Joints, Terminations, Separable Connectors, Cable Tooling and Grid Connection Products used across...
