What is a cable cleat?
Cable cleats are devices designed and tested to ensure the retention and support of cables, and have been used for many years all over the world. However, it was not until 2003 with the emergence of the standard EN 50368 being released, that any standard for cable cleats existed. This standard not only highlighted the retention and support that cable cleats provided to cables, but more importantly it highlighted the protection
of the cable management system and the potential risk to human life without the use of cable cleats. Prior to EN 50368 both cable and cable cleat manufacturers provided their own testing to their own standards.
This was then followed up with the publication of IEC 61914 in 2009 which further highlighted the importance of cable cleat products, and correct cable cleating.
IEC 61914:2009
‘cable cleat’ according to IEC 61914:2009 defined as a:
‘device designed to provide securing of cables when installed at intervals along the length of cables.’
‘Note: A cable cleat is provided with a means of attachment to a mounting surface but does not rely on an unspecified mounting surface for the retention of the cables. Examples of mounting surfaces that may be specified are ladder, tray, strut, or rail, wire and beam. Where declared, cable cleats provide resistances to electromechanical forces’
cable cleat
Intermediate restraint
‘intermediate restraint’ according to IEC 61914:2009 defined as:
‘cable retaining device to be used with cable cleats to hold the cables together in order to provide resistance to electromechanical forces. Intermediate restraints are not attached to the mounting surface’
Can I use a circuit breaker instead of cable cleats?
Although circuit breakers are capable of instantaneous protection, damage to the cables under fault conditions occurs within the first quarter cycle of the fault. Within this period of time the circuit breaker cannot open to suspend the fault, resulting in cable management system damage. A typical circuit breaker interrupts the fault after three cycles. Whilst this may protect the equipment, the cables however may have already been damaged within this short duration and depending on the size of the short circuit, need replacing.
The replacement of any cables comes at a high price as this not only includes the expensive cable costs themselves, but the labour time of decommissioning, the reinstallation of the cable management system. Not only this but the downtime of the operation must also be considered.
The latest standard for cable cleats IEC 61914:2009 lays down the standardised method for testing and certification of cable cleats to prove they can withstand one or more short circuit tests: 6.4.3 resistant to electromechanical forces, withstanding one short circuit, 6.4.4 resistant to electromechanical forces, withstanding more than one short circuit.
Cable cleat selection
Cable cleat selection takes into account numerous factors listed below, and ideally if CMP Products can be supplied with the following: cable construction – type, ratings and diameter, system design, support structure and environment; it will then be possible to assist you with further advice on the correct type of cable cleat, and also the cable cleat spacing requirements for your specific application.
Cable – What type of cable is being used?
Diameter – The overall diameter of the cable will allow CMP Products to not only size the correct cable cleat, but it will also be required for calculating the short circuit forces the cable cleat maybe subjected to under fault conditions.
Performance – Does the cable have any fire performance (FR), or Low Smoke & Fume or Zero Halogen (LSF / LS0H / LSZH) requirements that the cable cleat would also have to adhere to?
Cable type – Is the cable a single core or multicore cable? What voltage is the cable? Low voltage (LV), Medium voltage (MV), or High voltage (HV).
Design – Overview of the cable management system
Mechanical load – what will the cable cleat have to support?
All CMP cable cleats having been tested for both axial and lateral loads, this will ensure they will be capable of supporting the weight of the cables(s).
Short circuit rating – What kA peak fault or RMS?
What is the maximum peak fault (kA) the cable may be subjected to under short circuit conditions? Based upon the specified cable the short circuit rating can be calculated with use of the standard IEC 61914:2009 to give the maximum forces the cable cleat will need to be able to withstand during a short circuit fault.
Cable configuration – Flat form / parallel or trefoil formation?
The cable configuration of the system will define the type of cable cleat required; either a single cable cleat, a trefoil cable cleat, a quad cable cleat, or this may even indicate that a bespoke cable cleat may be required which CMP Products will design, test, and certify to suit the cable management system requirements of its client.
Cable run length – How many cable cleats are required?
Whilst the spacing requirements for cable cleats will be subject to cable formation, cable diameter, and short circuit rating, the overall cable run length will give the correct number of cable cleats required for the installation. Cable runs that turn through 90° must also be noted as the cable cleat spacing will be reduced throughout these bends.
Expansion
Single core cables expand and contract more due to temperature changes
than multicore cables. If the cable is constrained, considerable forces can be transferred to the supporting structure. To allow for this, single core cables
are generally “snaked” making slight loops to take up the expansion and contraction. It is also usual to allow some of the cable cleats to move freely and not restrain all cable cleats.
Cable cleats – Short Circuit Calculations
Installation
Professional Cable Management
Cable Ties
Heat Shrink Tubing
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Avatec Power has seen all the technological developments and innovations in the secondary power industries, and has the experience and technical know-how to provide the most ideal solutions to all of our valued customers.
MDS is a distributor of Avatec power products Thaila
CMP Products (Stock in Bangkok) is a leading specialist manufacturer of Cable Glands, Cable Connectors and associated accessories, used extensively for power, control, lighting and instrumentation cable applications in connection with IEC, NEC & CEC cables.
Having the widest portfolio of Cable Gland products to meet every kind of environment, CMP offers a variety of solutions for use in Marine, Explosive and Non Explosive (Industrial) Atmospheres, for a large selection of cable types.
The product search page of the website includes a number of the typical industry standard cable types found around the world that CMP cable glands can be associated with.
CMP design and produce Cable Glands with Ex d/Ex e Zone 1, Zone 2, Zone 21 & Zone 22 Approvals for use in Gas Group IIC environments under CENELEC & IEC Area Classification rules. Additionally Cable Connectors for NEC & CEC Classified Explosive Atmospheres Locations, are available for Class I, II & III, Divisions 1 & 2, where Gas Groups A, B, C, D and Dust Groups E, F & G are present.
International Explosive Atmospheres Approvals are held from Atex, IECEx, CEPEL/Inmetro, CSA, cCSAus, UL, GOST, EAC, NEPSI, TUV, and CIDET.
In addition Marine Classification Society Approvals from Lloyds, DNV & ABS are also held.
http://csdsealingsystems.co.uk/
CSD has specialised in the supply of technically advanced cable transits, flexible pipe penetrations and RISE cable duct seals within the UK for over 20 years.
Our product range is suitable for applications within the shipbuilding, offshore and onshore construction industries and is also widely used across the utility and nuclear industry. The systems can provide up to 4 hours of fire protection, will offer the highest levels of watertight and gastight integrity and are proven to provide in excess of 50 years long term protection.
With a range that is expertly designed, CSD products are ideally suited for numerous environments, both Onshore and Offshore. With products retaining extremely high levels of protection and age tested to ensure no deterioration in performance in excess of 50 years, CSD Sealing Systems offer the ideal solution to any high risk environment.
All CSD products have been extensively tested, not only at Beele Engineering/CSD International’s technical laboratories in the Netherlands, but also by independent experts. Beele Engineering/CSD International hold type approval certificates from all major worldwide classification societies on the full range of CSD products. These include certificates issued by Lloyds Register of shipping, Det Norske Veritas, Bureau Veritas, Registro Italiano Navale, Germanischer Lloyd, the Maritime & Coastguard Agency and the US Coast Guard.
MDS is a distributor of CSD products located in Thailand.
MDS2you Distribution Nexans Cables Thailand
http://www.nexans.com/
Nexans is present at every level of oil and gas production, providing a wide range of energy and telecom cables for onshore exploration, production and distribution, as well as for refinery and petrochemical infrastructure.
Our innovative technologies include lead-free energy cables and ultra-cold energy cables for extremely cold conditions. Nexans also provides high-speed fiber and copper backbones for data transfer and remote control applications. We have pioneered sheathings that resist sea salt, chemicals, and “mud” for both wellhead and refineries. To protect infrastructure and people, we have also developed advanced fire-performance products, and have been carefully tracking and improving materials for easy recycling.
For onshore projects, we are present from the very outset, contributing to the front-end design of cables and network planning. At the delivery end, we use our unique supply chain, global services and technical support to help international contractors and engineering firms meet the complex challenges of the hydrocarbon processing industry.
For international megaprojects, we can draw on the manufacturing strengths of several plants worldwide.
Nexans takes an integrated approach to your needs
MDS is a distributor Of Nexans cables located in Thailand.
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Capacity (YOFC Group): Preform 1200 T Fibre 35 M KM Cable 28 M fKM
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