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rCABLES & CONNECTORS


eliminating the need for separate wiring for each purpose. In doing so, this reduces installation costs and improves flexibility by removing redundant cabling. There is no denying the window of opportunity


PoE technology has created, however the need for power and data through a singular cable has caused additional infrastructure considerations. Utilising existing cable structures reduces installation time and money, however in order to do this the cable needs to be fit to accommodate the additional current being transmitted. There are many industries that have successfully adopted the use of PoE, for example surveillance cameras, air conditioning systems, telephones and supermarket checkouts. PoE has improved efficiency and created opportunity however without the correct structured cabling infrastructure in place it can experience multiple issues such as overheating or connection issues affecting the integrity of the data for the end user. The adoption of PoE within supermarkets has made it easier for them to install multiple self- service checkouts in one location. Enabling high volumes of data and power to be transmitted to and from the device over a singular ethernet cable. 2002: The first PoE standards were introduced outlining the types of devices and applications compatible with power sourcing equipment (PSE)


Preparing your cabling for Power over Ethernet P


ower over Ethernet (PoE) refers to the phenomenon of running power and data transmission through the same cable,


for category 3 cables and higher. 2018: The IEEE 802.3bt was introduce to support devices which required higher power supply such as laptops, televisions and video conferencing, enabling power delivery over all four pairs


When considering which data cables are fit for your operations, there are some key cabling recommendations for PoE applications. If a data cable is exposed to heat, the attenuation of the cable rises and can affect signal performance. For this reason, ISO and TIA standards define an operating temperature of no higher than 20°c. When power flows through your cables, the copper conductors will start to generate heat and in turn cause the data cable’s operating temperature to rise. This is a common occurrence when the cables are bundled together, which is often how they are installed but prevents heat from escaping and causing build up. As PoE standards allow for higher power transmission, as resistance increases a rise in temperature can also been seen for the cable and its surrounding areas. As such this consideration has now become more of a conscious design feature required for data cables destined for implementation in complex infrastructures. The use of higher category cables, in itself, supports higher operating temperatures, as the cables are able to support higher levels of current flow, which minimises the risk of resistance and overheating. For this reason, many current infrastructures


commonly utilise CAT 6A cable or higher. There has been an increased use of PoE cables


within industrial environments. Factories and warehouses are also increasingly using smart technologies to streamline their business processes, facilitated by the implementation of integrated devices for optimised data transfer. The use of PoE within these devices reduces the number of cables and removes restrictions in terms of installation, location and more. However, these cables can be more significantly prone to damage. As a direct consequence of the environments within which they are placed, cables can often fall, drop or risk being crushed. This in turn could compromise their ability to transfer data or transmit power. Damaged cables can cause machine outages which could have a huge financial implication on the organisation. PoE cabling is used in a wide range of devices, and within industrial business environments, air conditioning systems, driven for IoT technologies, central control units, and smart lighting systems. In order to meet the demand for future PoE requirements high quality cable and connectivity is essential to maintaining continued performance and reliability. Cabling testing should be carried out to indicate performance parameters such as temperature control, transmission testing and performance futureproofing.


BASEC | basec.org.uk


Clynder Cables lead the way on Low Smoke Zero Halogen panel wires


P


anel wires are a mainstay and key component of any industrial control panel. They can be used in electrical cabinets, switch control, relay and instrumentation panels of power switchgear and are a frequently sought-after industrial component.


With ever increasing awareness of fire situations and how components react in them, recent trends show a move in the market towards Low Smoke Zero Halogen (LSZH) panel wires. In a fire situation, LSZH cables produce extremely low levels of smoke and toxic fumes with zero acidic gases. This is unlike PVC cables which can produce large amounts of smoke and toxic fumes when subjected to fire.


This means increased visibility and reduced air toxicity, leading to faster evacuation of a building and reduced danger from smoke inhalation. Therefore, these cables are often specified for equipment installed in public buildings such as hospitals and schools as well as government and commercial buildings.


2491B/6701B CABLE - THE INDUSTRY’S LSZH PANEL WIRE OF CHOICE


2491B / 6701B cables (also known as H05Z-K & S4


H07Z-K under the harmonised codes) are a BASEC approved panel wire and considered a suitable LSZH alternative to PVC panel wires.


They are also sometimes


referred to as LSOH cable or LSHF (Low Smoke Halogen Free) cable.


Clynder Cables keep a full range of stock of 2491B / 6701B from 0.75mm² up to 16mm². These cables are available off the shelf in a wide range of colours for next day delivery. Other sizes and non-standard colours can be manufactured to short lead times. Clynder Cables’ products are all British- manufactured and well known for their colour consistency and uncompromising quality. The Clynder Cables brand has wide market recognition and the company is an approved supplier to some of the most prestigious names in the UK Electrical Wholesale and Distribution industries. Enquire through your local wholesaler for Clynder 2491B / 6701B.


LSZH VS LSF CABLES


When it comes to fire safety, some installers enquire after LSF cables. There is a common


ELECTRICAL ENGINEERING • SUPPLEMENT • APRIL 2021


misconception that Low Smoke and Fume (LSF) cables and LSZH cables are one and the same. This is completely incorrect and any confusion between the two could be life-threatening in the event of a fire. LSF cables are manufactured using PVC


compounds. When cables are labelled as “Low Smoke and Fume” or “LSF”, it means that the manufacturer has modified the compound with a number of additives in order to reduce smoke and HCl emissions. This however does not eliminate them.


While Low Smoke Zero Halogen Cables are subject to strict standards, LSF cables have no standards covering them. In consequence, LSF cables have been found to emit HCl levels in excess of 20% when subjected to fire. It is therefore important to always specify LSZH when asking for a Low Smoke Zero Halogen cable.


CLYNDER CABLES | clyndercables.co.uk electricalengineeringmagazine.co.uk


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