31 January,
The differents electrical cable types has the purpose of transporting electrical energy from one point to another. Depending on their final application, cables can have different configurations, always basing their design on national and international regulations.
INDEX ToggleAn electric cable is measured in volts and, depending on these, they are categorized into one group or another:
Flexible cables for wiring electric cabinets. These electric cables are especially suitable for domestic use, for installation in public places and for internal wiring of electrical cabinets, switch boxes and small electrical appliances.
Energy cables for industrial facilities and public places. It is common to find power cables in applications for power transmission in all types of low voltage connections, for industrial use and for variable frequency drive (VFD).
Cables with aluminium or steel reinforcement for installations with risk of mechanical aggression. It is also common to find armoured cables in places where rodents are present, as well as in installations in premises with a risk of fire and explosion (ATEX).
The use of extra flexible rubber cables is very varied. We can find rubber cables in fixed industrial installations as well as in mobile service. Welding cables should have a rubber sheath, which allows high currents to be transmitted between the welding generator and the electrode.
High Security Halogen Free (LSZH) Cables with low smoke and corrosive gas emission in case of fire are suitable for use in wiring of electrical panels and public places, installations of all kinds in public places, individual derivations, emergency circuits, public distribution networks and also for mobile service.
These cables are specially designed to transmit electrical energy in the extreme conditions that occur during a prolonged fire, guaranteeing supply to emergency equipment such as signalling, smoke extractors, acoustic alarms, water pumps, etc. Their use is recommended in emergency circuits in places with public concurrence.
Control cables for fixed or mobile installations should be extremely flexible, as they are mainly designed for small household appliances, for the interconnection of machine parts used for manufacturing, for signalling and control systems, for the connection of motors or frequency converters, for signal transmission where the voltage induced by an external electromagnetic field may affect the transmitted signal or for power supply connections to avoid generating electromagnetic fields.
These are flexible and shielded cables for the transmission of signals between equipment in industrial installations. Especially suitable for optimum data transmission in environments with a high level of electromagnetic interference.
These cables are particularly suitable for connecting photovoltaic panels, and from the panels to the DC to AC inverter. Thanks to the design of their materials and their cover, which is especially resistant to solar radiation and extreme temperatures, they can be installed outdoors with full guarantees.
There is a wide variety of electric cables for special installations such as: temporary light garland installations at trade fairs; connections for overhead cranes, hoists and lifts; applications in submerged pumps and drinking water areas such as aquariums, purification systems, drinking water fountains or in swimming pools for lighting, purification and cleaning systems.
Aluminium cables for power transmission are suitable for fixed installation indoors, outdoors and/or underground.
Medium Voltage Cable type RHZ1 with XLPE insulation, halogen free and non flame and/or fire propagating. They are cables perfectly adapted for the transportation and distribution of energy in Medium Voltage networks.
Medium Voltage cable with HEPR insulation, halogen-free and not flame- and/or fire-propagating Ideal for the transportation and distribution of energy in Medium Voltage networks.
Medium Voltage cable with XLPE insulation, according to American standard. For transportation and distribution of energy in Medium Voltage networks.
Copper and aluminium medium voltage cable for special applications. Especially recommended for installations where there is a risk of presence of oils and chemical agents of the hydrocarbon type or their derivatives.
An electric cable consists of:
The insulation consists of placing an insulating coating on the conductor to prevent current leakage. They are classified into two large groups: thermoplastic and thermoset.
They are most common in the manufacture of electrical cables are:
The most common are:
In some cases, the cables may have metal shields.
Each cable has a standard designation. This designation is composed of a set of letters and numbers, each with a specific meaning. This designation refers to a series of product characteristics (materials, nominal tensions, etc.) that facilitate the selection of the most suitable cable for your needs, avoiding possible errors in the supply of one cable by another.
When a cable does not clearly indicate these data, it may be a defective cable, which does not comply with safety regulations or guarantee the cable’s life and proper operation.
If there is no screen, no inner lining and no armature seat, no letter is used.
The cable design rules are also referenced in the marking of each cable:
You can review concepts through this video that we have prepared:
There are two sizing criteria for copper conductors:
The colours of the electrical cables are governed by the International Electrical Commission Standard IEC . For the identification of the conductors, the following colors are allowed: black, brown, red, orange, yellow, green, blue, violet, gray, white, pink and turquoise.
Carrying out outdoor electrical installations means taking into account a series of parameters that do…
The cables come in different types and sizes, which makes it possible to supply electricity…
Among the parts of an electrical cable, there are four different layers. The conductor, which…
In any electrical installation, choosing the right fittings is important for both safety and functionality. This guide covers a wide range of common electrical fittings types, each suited for specific applications and environments. Understanding these can assist you in creating robust electrical systems compliant with regulations and capable of handling the demands of your power distribution needs. But first, let’s find out what this term means.
What Are Electrical Fittings?
Electrical fittings are components used to connect, secure, and protect electrical wiring in various installations. They include a variety of items designed to work together to create safe and efficient electrical connections.
Goto Tongda to know more.
These fittings help in managing the flow of electricity, providing protection against short circuits and electrical hazards, and allowing for the organization of wiring within walls, ceilings, and other structures. Proper use and installation of electrical fittings are essential for maintaining the integrity and safety of electrical systems.
Conduits and Conduit Fittings
Conduits are protective tubes that house and protect electrical wires from external elements and interference. These are typically made from materials like steel, aluminum, or PVC and are essential in creating a safe electrical path.
Electrical conduit fittings connect these tubes to electrical boxes, enclosures, and other conduits. They include elbows, couplings, and connectors, which help in making turns or extending the conduit system without exposing the wires.
Junction Boxes
Junction boxes are enclosures that protect wire connections while providing a space for wires to split off in various directions. They come in different sizes and materials, suitable for specific environments and load requirements. These boxes play a role in preventing short circuits and electrical fires by keeping connections secure and covered.
Electrical Boxes
Similar to junction boxes, electrical boxes serve as meeting points for electrical wires. They host switches, outlets, and other electrical devices while providing a protective environment where wire connections are made. These boxes can be flush-mounted or surface-mounted depending on the installation requirements.
Cable Trays
Cable trays support insulated electrical cables used for power distribution and communication. They are common in industrial and commercial construction, providing cable protection and management in places with open wiring. They come in various types such as ladder, solid-bottom, trough, and channel types, each offering different levels of protection and ease of access.
Fittings for Flexible Conduits
Flexible conduits require specific fittings that can handle their adaptable nature. Fittings for flexible conduits include straight and angled connectors, usually made of brass or plastic, which help in securely attaching the conduit to electrical boxes and devices. These fittings are ideal for areas where rigid conduits are impractical due to structural barriers.
Weatherproof Boxes and Covers
In outdoor or moist environments, weatherproof boxes and covers keep electrical components dry and operational. These are designed to withstand elements like rain, snow, and humidity. Typical applications include exterior lighting and power outlets in residential and commercial settings.
Grounding Fittings
Grounding fittings provide safety in any electrical system, providing a safe path for electrical current in case of a short circuit. These fittings help to connect grounding wires to the grounding system effectively, ensuring that any fault current is safely directed towards the earth, thus preventing potential electric shock or fire.
Explosion-Proof Fittings
In industries where flammable gases or dust are present, explosion-proof fittings are an important part of electrical systems. These are designed to contain any sparks or flames that might occur, preventing them from igniting the surrounding atmosphere. Such fittings are typically made of robust, heavy-duty materials that can withstand extreme conditions.
Pulling Fittings
Pulling fittings, such as pull elbows and conduit bodies, are used where wires need to be pulled through a series of conduits. These fittings provide smooth internal surfaces that reduce the amount of force needed to pull the wire, minimizing the risk of damaging the wire insulation during installation.
Locknuts and Bushings
Locknuts and bushings are used to secure and protect the connections between conduits and electrical boxes. Locknuts tighten the connection, while bushings are inserted at the end of the conduit to prevent the sharp edges from cutting into the wires, providing an additional layer of safety.
Cable Glands
Cable glands secure and attach the end of an electrical cable to the equipment. They are used for strain relief and to connect cables to electrical devices, enclosures, or junction boxes, ensuring that the cables are securely fastened and protected from environmental factors.
Wire Connectors and Terminals
Wire connectors and terminals facilitate the connection of wires to devices and other wires. They come in various forms, such as butt connectors, ring terminals, or spade terminals, each designed to provide a reliable and secure connection in different electrical circuits.
Insulating Bushings
Insulating bushings protect wires from being damaged by the sharp edges of conduit ends. These bushings are typically made from plastic or rubber and are inserted into the ends of conduits where wires enter or exit.
This is particularly important in preventing the insulation on wires from being scraped, which could lead to shorts or electrical fires. Insulating bushings are a must in installations where multiple wires pass through a single conduit.
Conduit Hangers
Conduit hangers support and secure conduit pipes to walls or ceilings, maintaining structural integrity and alignment within various installations. These fittings keep conduits fixed in place, especially in environments where vibration or movement could dislodge loosely mounted conduits. They come in various sizes and materials, designed to accommodate different types of conduits and environmental conditions.
Cable Ties
Cable ties are versatile fittings used to bundle and secure cables and wires, keeping electrical installations neat and organized. They help maintain an orderly arrangement of wires, which facilitates easier maintenance and inspection while also enhancing safety by reducing the chance of loose wires causing shorts. Available in various lengths, strengths, and even materials (such as nylon or stainless steel), cable ties can be used across a broad range of applications, from residential DIY projects to complex industrial electrical systems.
Choosing the Best Fittings - Comprehensive Solutions from Sonic Electric
Whether you are upgrading an old system or designing a new project from scratch, the right fittings make all the difference in the world of electrical installations. Sonic Electric offers a wide range of high-quality electrical fittings and components suited for all types of environments and applications.
For more Fixed Wiring Cableinformation, please contact us. We will provide professional answers.