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Safe Working on Electrical Installations by DEHN | Earthing & Short-Circuiting Devices

Earthing & Short-Circuiting Devices Electrical Safety

Safe Working on Electrical Installations

Earthing and Short-Circuiting Devices

Save you life during work on electrical installations

When working on electrical installations, it is crutial that the five safety rules are observed.

Earthing and short-circuiting at the work location is the key element of these rules. It ensures a de-energised state for the duration of the work in case of interference voltages, atmospheric overvoltages or accidental re-connection.

Thorne & Derrick provide an extensive range of electrical safety equipment including insulating gloves, voltage detectors, insulating matting and portable earthing to ensure worker safety when carrying out maintenance on LV-HV switchgear, substations, cables and electrical equipment.

Five Safety Rules
In Accordance with EN 50110-1 (DIN VDE 0105-100)

1. Disconnect completely
2. Secure against re-connection
3. Verify that the installation is dead
4. Carry out portable earthing and short-circuiting
5. Provide protection against adjacent live parts

The installation must be disconnected completely and secured against re-connection first. After testing and verifying with a voltage detector that the installation is dead, the earthing and short-circuiting device is connected to the earthing system. Then, it is connected to the parts to be earthed using an earthing stick. The earthing and short-circuiting device should be visible from the work location.

Electrical safety Equipment From DEHN

Short-circuiting cable

The transparent node unit and cables ensure easy visual inspection and allow the user to immediately detect signs of damage and corrosion. The cables and the connection element are fixed, thus preventing this connection from becoming loose even in case of the dynamic load of short-circuit currents. The cables are particularly robust and available with a cable crosssection up to 150 mm².

Laser marking
The new laser marking on the short-circuiting cable ensures permanent marking with the most important product information – directly on the product.

Universal clamp
We have clamps for every application: For fixed ball points with a diameter of 20 mm and 25 mm and flat clamps for copper bars. The PVC-sheathed cable lug ensures protection against twisting and damage.

Ball head cap
Ball head caps are available as rigid and adjustable ball head caps. A ball head cap that can be rotated by 4 x 90° allows the earthing and short circuiting device to be used in the most favourable position. The connection between the fixed ball point and the ball head cap ensures an extremely high degree of short-circuit strength.

Earthing and short-circuiting devices are produced in a standard-compliant and proven manner and are extensively tested in our test laboratories.

In-house production of all components ensures maximum quality and safety in terms of function and handling. With earthing and short-circuiting devices from DEHN you are always on the safe side.

Earthing and short-circuiting configurator

Easy online configuration of earthing and short-circuiting devices

Safe working on electrical installations is only ensured if the earthing and short-circuiting device is configured correctly. Thus, the selection of the earthing and short-circuiting device is always the first step. The new earthing and short-circuiting configurator makes selection easy:

• The intuitive menu navigation allows quick selection of the right earthing and short-circuiting device for your application.
• Precise and perfectly harmonised selection of the connection elements and earthing and short-circuiting cables.
• The variant number allows to clearly identify the finished product and order it at a later date.
• You may also use the Part No. of your previous orders for configuration.
• The selected product can be added to the shopping cart, sent via e-mail or printed.
• The technical data on the product are directly linked – online and thus always up to date.

➡ New earthing and short-circuiting configurator

Earthing and short-circuiting device in 8 steps

1. Selection mode
   First select
   a. Product view or
   b. System view
   Select the product view if you already know which cable cross-section and clamps are to be used. In the system view the parameters of the switchgear installation are entered, for example the maximum short-circuit current and the type of earthing. Whether product or system view – both solutions lead to a technically sound earthing and short-circuiting device.
2. Basic structure
   Define the basic structure of the earthing and short-circuiting device.
3. Phase cable end cross-section
   Select the phase cable end cross-section of the short-circuiting cables.
4. Earth cable end cross-section
   Decide whether the earth cable ends should have the same cable cross-section or a reduced cable cross-section.
5. Phase cable end equipment
   Select the shaft type and connection element to be used on the phase cable end.
6. Earth cable end equipment
   Select the operation and connection element for earth cable ends.
7. Earthing stick
   Optional earthing sticks are available as accessory in different lengths and versions.
8. PDF of your selection
   You can print the result of your selection, add it to the shopping cart or send it via e-mail. You may certainly return to your selection to make changes.

DEHN

DEHN are committed to the protection of workers and material assets. The energy and the spirit of innovation of more than 1,400 employees are reflected in their developments and innovative products in the field of lightning protection, surge protection and safety equipment.

The continuous growth of the DEHN group reflects their strong commitment to lightning protection, surge protection and safety equipment. The company’s global network of 11 subsidiaries and numerous sales partners passes on know-how and distributes high-quality products that are produced at their headquarters.

DEHN ensure that your buildings and installations are protected during operation, maintenance and repair. Their focus is particularly on wind energy, photovoltaic, process industry, traffic and communication solutions. You can be assured: DEHN protects.

ELECTRICAL SAFETY PROVIDERS

We protect substation engineers, asset managers, SAPS, cable jointers, overhead linesmen and utility workers with PPE and safety equipment: this includes insulating gloves, arc flash clothing, voltage detectors, insulating matting and portable earthing to ensure worker safety when carrying out repair and maintenance on LV-HV switchgear, transformers, substations and turbines.

All of our Cable Connection & Energisation Accessories including Medium & High Voltage joints, terminations, connectors and cleats are tested to the latest international standards and supporting ranges of professional installation tools are stocked to reduce incident, accident and downtime to plant and people.

Copper Terminal Lugs | NEW Range of Electrical Connectors from Cembre

Copper Terminal Lugs

Copper Terminal Lugs by Cembre

Cembre has introduced two new terminals DR-NST into the existing DR-N copper terminal range for high quality and reliable LV & MV electrical connections:

Cembre DR16-10N-NST (Conductor Size 16mm2)
Cembre DR25-10N-NST (Conductor Size 25mm2)

The Cembre DR-N series of cable lugs are manufactured from electrolytic copper tube Cu-OF CW008A conform to UNI EN 13600.

Which are the main features?

• the annealing process optimizes the structural features of the material allowing an easier crimping and it guarantees the use of the electrical connector even with mechanical solicitations of various nature;
• the barrel entrance of the lug is chamfered to allow an easier and correct conductor insertion and its length facilitates precise positioning in the crimping tool die;
• cable lug dimensions are according to DIN 46235

UL listed for US and CANADA per UL486A-486B up to 35kV.

Cable cutting and crimping tools manufactured by Cembre are used to cut or crimp most types of low, medium and high voltage cables including EPR, PILC, XLPE, PVC insulated cables with copper or aluminium conductors, lead sheath, steel wire armour (SWA) or wire braid.

• Cembre Tools
• Mechanical Tools
• Ratchet Tools
• Hydraulic Tools Cable Cutters | Hydraulic Crimping Tools
• Battery Operated Tools
• Crimping Tools | Hydraulic Pressheads

Cembre tools are used for cutting and crimping underground cables or overhead lines to support the installation of LV-HV power cables and conductors into switchgear, substations, transmission and distribution networks – tools are the highest quality for the compression of connectors, lugs and joints in high voltage electrical cable installations in both indoor and outdoor locations from LV up to 33kV.

Cembre HT131-C Cable Crimping Tool | the industry leading and most extensively used hydraulic crimping tool for the connection and compression of electrical connectors, lugs and splices up to 400sqmm. This new model, self contained, robust and sturdy, will accept all semi-circular slotted dies, common to most 130 kN tools. The Cembre HT131-C tool features a double speed action: a fast advancing speed for rapid approach of the dies to the connector and a slower more powerful speed for crimping. For ease of operation and comfort of the operator the tool head can be fully rotated through 180 degrees. The built-in safety valve will by-pass the oil supply when the maximum pressure is reached, and the pressure release system can easily be operated at any stage of compression.

Stockists & Suppliers for the Cembre range of Electrical Connectors & Tools

Earth Bars | Wallis Earth Bar Software (WEBS)

Earth Bar Software

Copy & Video Courtesy of Andrew Trew | Marketing Administrator (AN. Wallis)

Copper earth bars provide a convenient common earthing point for electrical installations that require an earthing and lightning protection system, so why not send your earth bar enquiries to a company that has given blood, sweat (and a lot of) tears to a piece of software that truly breaks new ground in the world of earth bars.

Below is a 30-second video that shows the new Wallis Earth Bar Software (WEBS) creating:

·        A 6-way earth bar
·        Adding 2 disconnecting links
·        Increasing the bar size from 50x6mm to 75x6mm
·        Changing material of the hard-drawn plain copper bar to hard-drawn tinned copper bar
·        Changing the base from Black PVC to Galvanised Steel to just feet

All topped off with a nice twirl at the end to give you a full 360-degree view of the earth bar.

This video only scrapes the surface of what this software can produce, and it is worth mentioning again that the below earth bar and its variations were completed well within 30 seconds! Ready to be sent to our customer for their approval. This is an internal piece of software that is used by AN Wallis staff daily to send the drawings that this software can produce for approval.

Send your earth bar challenge to Thorne & Derrick and let us amaze you with a full plan and side view upon completion along with an instant quote for your earth bar.

Earth Bar | Design & Specification & Manufacture Service

Pictured | Last month this project required 3 batches of 14 units of an earth bar with 18-way termination points and twin disconnection links for an OEM application in the industrial noise control sector. AN Wallis WEBS software was utilised to generate the above graphic concept of the finished manufactured earth bar. You can download the earth bar file here.

Further Reading

• Earth Bars | High Specification Copper Earth Bars for Lightning Protection Systems
• Correct Termination Of A Cable Lug Onto An Earth Bar | AN Wallis Guide

Earth Rods | Earth Tapes | Copper Earth Plates | Copper Earth Mats

THORNE & DERRICK are national distributors of LV, MV & HV Cable Installation, Jointing, Duct Sealing, Earthing & Electrical Equipment – we service UK and global businesses involved in cable installations, substation, overhead line and the installation of medium/high voltage cable joints and terminations at LV, 11kV, 33kV and HV.

Contact us for 3M Electrical, ABB, Alroc, AN Wallis, CATU Electrical, Cembre, Centriforce, CMP, CSD, Elastimold, Ellis Patents, Emtelle, Euromold, Filoform, Lucy Electric & Zodion, Nexans, Pfisterer, Polypipe, Prysmian, Roxtec, Sicame, WT Henley.

Foam Fails | Compliant Duct Sealing Systems for Substations & Electrical Networks

Duct Sealing Systems

Competitive Prices | Large Stocks | UK & Exports Sales | Technical Support | Site Survey & Demonstrations | Sealing Cables & Pipes

Most UK utilities have banned the use of expanding foam as a measure to effectively seal cable ducts against water ingress, gas migration or fire spread. Failure to correctly and safely seal cable ducts can inflict catastrophic damage to LV MV HV Electrical Distribution Networks, Substations and Power Supply.

Failure to correctly and effectively seal cable ducts can inflict catastrophic damage to LV-HV electrical distribution networks, substations and power supply. View below our complete ranges of Duct Sealing Products including cable transits to provide a watertight seal and defence against flood damage to low, medium and high voltage cable ducts with additional protection against harmful flammable gas migration and fire spread.

Contact Thorne & Derrick for largest UK stocks of several leading brands of Cable & Pipe Sealing Systems adopted by both electric (UK DNO Approved) and water (WIMES Specification) utilities. Call us with your Enquiry.

Expanding foam spray is effectively banned for sealing cable ducts in electrical and water utility sectors – the soft large cell structure will inevitably break down overtime and fail to provide adequate protection against water ingress or flooding into substations or buildings

Hauff-Technik Puts Down Roots in the UK

PR | BY Hauff-Technik | 02.03.2023

Hauff-Technik, a leading manufacturer of sealing systems for cables, pipes and building entries has put down roots in the UK.

With the new subsidary in Chesterfield in the heart of England, Hauff-Technik are strengthening their sales activities in United Kingdom.

Today, we are establishing our next national company: Hauff-Technik UNITED KINGDOM Ltd.

The establishment of a further subsidiary is intended to respond more intensively to customer needs, increase competitiveness and achieve even faster market development.

The newly founded Hauff-Technik UK Ltd. is based in Chesterfield, UK and is headed by Thomas Koelle and Jan Holly as Managing Directors.

“By being able to supply a wide range of products from stock, we have fast lead times for delivery within 24 hours on the UK mainland,” says Thomas Koelle. “With a dedicated team of two field sales representatives, we do not only offer direct local contact, but also offer in-house training as well as on-site support and advice,” adds Jan Holly.

“The foundation underlines our long-term strategic interest in the British market and also its important position within Europe. We would like to significantly expand our sales efforts in the UK in the future and are now laying the foundation for this,” comments Dr. Michael Seibold, Managing Director of the parent company Hauff-Technik, based in Hermaringen in Baden-Wuerttemberg.

Previously, the company had three subsidiaries: Hauff-Technik GRIDCOM GmbH in nearby Rosenberg, Hauff-Technik MIDDLE EAST LLC in the United Arab Emirates, and Hauff- Technik SWISS AG in Switzerland.

Hauff-Technik Puts Down Roots in the UK

Hauff Technik are leading manufacturers of sealing systems for cables, pipes and building entries. They have been protecting buildings from penetrating water, gas, fire, dirt and vermin for the past 60 years. Specialising in sealing cable entries for secondary substations, Hauff Technik’s innovations help protect and set standards in the energy supply sector.

Contact Thorne & Derrick for the most extensive range of Cable & Pipe Sealing Systems to protect electrical substations, cable ducting systems, building entries and power infrastructure at LV MV HV. 

Further Hauff Technik Reading

• Hauff-Technik Officially Approved By Scottish & Southern Electricity Networks
• Cold Shrink-Fit Method vs. Heat Shrink-fit Method