Types Of Cable
Types of cables
Typically used for powering projects in projects and for all types of low voltage, medium voltage and high voltage cables, cable trays are used.

The purpose of this cable tray is to support, route and protect the cable as part of the cable management system in projects. Through national standards and standards defined by NEMA and the Cable Tray Institute, you can find articles, standards and other general guidelines on how to properly use and install cable tray systems.

The cable tray system is only one component of the cable management system. Another important factor is that depending on the type of project defined and obviously Kabul is one of the most important. Therefore, it is very important to understand the proper use and installation of cables in the cable tray system. To this end, this text has been provided to your dear friends to discuss the types of cables most commonly used in cable trays and the wiring permitted in cable trays under NFPA 70 National Electrical Code (NEC). Use it.

In general, cable trays are a high quality product and are the best choice for this system due to the standards of their manufacture as well as high resistance to physical pressures as well as various atmospheric conditions along with various tests performed on them. . Cable trays can be used indoors, indoors, for areas with high humidity and with high environmental corrosion risk. The cable trays must come out of the various tests that have been defined and the various aspects of the cable tray are examined.
In many cases there is more than one type of cable for a particular application, for example the cable (TC) and the cable (MC)

Types of cables permitted for cabling in cable tray systems as well as permitted cabling methods can be found in
NEC 392.10 (A) observes that it describes the terms of use and the installation requirements

In this section you will also find various articles related to the class and type of specific cables. Additional considerations such as the capacity of the cable tray filling capacity and the permissible cable amp, the type of cabling in the cable tray are fully explained in terms of functional differences between cables and cables for emergency systems, etc.

Respected contractors should be fully aware of the details of the system and consult with the cable tray manufacturer, as appropriate, and then implement the project.

Types of cables that are most used in projects:

Cable - TC type
Limited power cable - PLTC type
Instrumentation cable - ITC type
Cladding Cables - MC Type
Mineral insulators, cladding cables - Type MI
Fiber optic cables - OFC types through OFN
Communication Cables - CMP, CMR, CMG, CM, CMX types
Fire Alarm Cables - NPLF Type - NPLFP, FPL-FPLP (CI)
TC Type - Tray Cable - (NEC Article 336) - TC Type Power and Control Cable A factory assembly of two or more conductors, with or without bare or covered conductors, underneath which is non-metallic. TC cables are rated for 600 volts and can be used in industrial or industrial control circuits where flame retardant cables are desired.

Authorized installation sites include these types of cables, access roads, and locations outside indoor environments supported by a messenger. The cable is a TC UL type specified for use in Class 1, Part 2 dangerous circuits, and Class 1 control circuits. If used for such cases, TC cables can also be used for landfill.
In industrial installations that make sure that only qualified people install the service, the cable is constantly supported and protected from physical damage, select the type of TC tray cable to Equal to impact resistant (TC-ER cable type) between a cable tray and operating equipment or device. These types of cables must be secured at distances above six feet.
TC cables are allowed to be installed outside the cable or rail tray system with only two exceptions (1) are not in external locations supported by a messenger. (2) In case of physical damage, TC-ER type cable is allowed to move freely between cable trays or between cable trays and equipment for a maximum distance of up to six feet without continuous support.

Type PLTC - Power Limit Tray Cable - (Article 725 NEC)
ITC Type - Instrument Tray Cable - (Article 727 NEC) - These cables are precision instrument cables and are in shielded or unprotected structures consisting of several single conductors, twisted pair without shielding or shielding, with or without armor. Metal are available. They have a degree of insulation of 300 V and are available in sizes from 22 AWG to 12 AWG. PLTC cables are intended for Class 3 and Class 2 non-plenum and non-lift circuits. They are specially designed for use with power limiting circuits. Use of List Cables required by Article 725. The PLTC requires a power supply.

To prevent this, an alternate cable class, the Instrumentation Tray Cable (ITC), was added to the 1996 NFPA 70. The ITC cable is described in Article 727 and does not limit the power supply of Article 725. However, the ITC cable may only be installed on instrumentation circuits installed at 150 volts or less and 5 amps or less.

Today, many manufacturers double-check these cables as PLTC / ITC. Each class or second-class cables also have ER-grade cables, and so may be installed as previously discussed for TC-ER cables, with the exception that PLTC-ER and ITC-ER need to be continuously installed. Support with mechanical protection. It is safe to use support on your knees, angles, or canals and any heels.

ITC cables may be installed in industrial establishments where permanent maintenance and supervision conditions ensure that only qualified personnel perform the installation work. They may be installed in cable trays, highways, hazardous locations, such as overhead cables on messengers, direct burial, under false ceilings in industrial equipment rooms, and under false ceilings in IT equipment rooms.

ITC cables may not be fitted with power cables, lighting, Class 1 circuits that do not have limited power, or non-powered circuits unless they have a metal cover or are fitted with isolation equipment or boxes. Insulation to be maintained.
Even if it is shielded, both the PLTC and ITC cables must be disconnected from the 600 V power cord to prevent noise or cross talk. This is usually done through the separating wall inside the cable tray. However, the best route for power cables and instrumentation is to separate the tray line from each other.

MC-Metal Type Coating Cables - (NEC Article 330) - Clad steel cables are a series of one or more conductors of an insulated circuit with or without members of a fiber optic enclosed in an interconnected metal strip armor, or a smooth corrugated sheath. An overall plastic cover can also be made.

The MC cables are similar in appearance to the armored cables of the AC type. It is important to separate the two because they should not be confused. MC-type cables contain a ground conductor while AC-type cables have an internal connection strip in contact with the armor. Most importantly, MC type cables are suitable for outdoor use while AC type cables are not permitted for outdoor use (wet or humid places).

MC type cables are widely used in 600V and MV voltage, lighting and control applications. They are authorized to use services, feeders and branch circuits for electrical, lighting, control and signaling circuits in accordance with NEC 330 and 725. MC type cables may be indoors or outdoors, in wet or dry places, in hazardous places (Class I, Section I), in cable trays, as overhead cable on a messenger, on any approved test road. , Be buried (if identified) or enclosed in concrete (if identified). MC cables are not allowed to be subjected to physical damage. MC cables must be secured and secured at distances of more than six feet.

In many industrial applications cables, MC cables housed in cable trays have proven to be a great economical alternative to cable in the duct.

MI-Mineral Insulated Metallic Insulators, Metal - (Article NEC 332) - MI Cables Assembly Plant One or more conductors insulated with highly compact refractory insulation, typically magnesium oxide, in a solid wire and gas tight Is tight or enclosed. Alloy steel sheath. They can also be provided with a general plastic jacket for extra corrosion protection. Built in the late 1920s by the French Navy for underwater electric wiring systems, properly installed MI cable is usually the safest electrical wiring system available.

Because MI cables do not use organic material as insulation (except at the bottom), they are more resistant to fire than plastic insulated cables. MI cables are used in very high temperature applications and / or important fire protection applications such as alarm circuits, fire pumps and smoke control systems. MI cables have a two-hour fire extinguisher for emergency services and can be used as complete cabling without a general non-metallic jacket. MI cable is also used in process industries for handling flammable liquids, otherwise small fires can cause damage to control or power cables. The MI cable is also very resistant to ionizing radiation and is used in applications in nuclear power plants and nuclear physics.
MI cables are suitable for 300V and 600V applications and are permitted for services, feeders and branch circuits for electrical, lighting, control and signal circuits. They may be exposed or concealed in dry, humid, or continuously humid places, indoors or outdoors, where embedded
Plaster, concrete or other masonry, in dangerous places, exposed to oil or gasoline, in basements or in cable trays.

MI cables are not permitted in underground uses unless protected from physical damage if necessary. MI cables are also not permitted when conditions are exposed to corrosion and corrosion of the metal shell, unless further protection is provided.

When installing on cable trays, MI cable shall comply with the installation instructions in accordance with NEC Article 392.30 (A).

OFN-OPC Type - Optical Fiber - (Article NEC 770) - Optical fiber (or "optical fiber") refers to the media and technology associated with transmitting information as optical impulses along a glass or plastic or fiber wire. Fiber optic cables have much more information than conventional copper cables and are far less susceptible to electromagnetic interference.

Fiber Optic Cable The cable contains one or more optical fibers used to carry light. Optical fiber elements are typically coated with plastic substrates and housed in a protective tube suitable for the environment where the cable is located. Different types of cables are used for different applications, such as long distance or high speed data connection between different parts of the building.
Fiber optic (OF) cables are rated as conductive or non-conductive. Conductive-grade cables contain non-current carrier members such as metal sheaths or armor. Conductive-grade cables do not contain electrical conductive material as non-conductive. They also score based on ULL. The test flame (s) are marked with their NEC building fire rating.

NEC Article 770.113 (H) supports all types of fiber optic cables in cable trays.

OFC: Fiber Optic, Conductive
OFN: Optical fiber, non-conductive
OFCG: Fiber optic, conductive, general use
OFNG: Fiber optic, non-conductive, general use
OFCP: Fiber Optic, Conductive, Plenum
OFNP: Fiber optic, non-conductive, plenum
OFCR: Fiber Optic, Conductive, Sahar
OFNR: Optical fiber, Non-conductive, Blender

Table 770.154 NEC (a) The mentioned fiber optic cable applications contain details of where these types of cables and cable trays are used in buildings and which type of cable may be used in cable trays. In summary:
Note: Where applicable, cables and cable trays should be installed in accordance with the installation procedures described in 770.110 and 770.113.

OFN (non-conductive) cables are allowed to hold the same cable tray with electrical conductors, Class 1, non-power fire alarm, ITC type or medium-bandwidth communication circuits of 1000 volts or less. they are working . OFC (conductive) cables must be separated from these other cables.

The cable tray filling capacities for fiber optic cables are not mentioned in Article 770 NEC and Article 392. Designers and installers should contact the cable manufacturer for guidance.

CMP Type - CMX Communication Cables - (Article NEC 800) Communication cables are used to send information signals. This can be done with coaxial conductors, copper conductors or twisted pair. These cables are used in a variety of applications including recording studio, data transfer, radio transmitter, intercom, electronic circuits, and applications where RF shielding is required. The NEC defines communication cables as the assembly of two or more conductors that have general coverage. The coating on the conductor assembly may include one or more metal members, power members or jackets. Ethernet cables are a common type of communication cable and are often listed and installed in accordance with Article 800 NEC.

Since communication cables are often driven through air circulation sites that often contain low fire barriers, they must be covered with materials that do not contribute to the spread of flames. Communication cables have been tested by UL and have been identified based on fire emission characteristics and are therefore suitable for use in areas of the building (ambient air control spaces).

Article 800 NEC defines these marks as areas of authorized use and provides hierarchies for cable posts.
Table NEC 800.154 (a) Listed Cable and Cable Applications in Buildings More details on any type of communication cable including, applications which cable trays may be used indoors, and what type of cable may be used It is to be used in cable trays. In summary:


* Example - Hanging ceiling space used for transportation purposes peripheral area.
Note: Where applicable, cables and cable trays should be installed in accordance with the installation procedures described in 800.113.

Fire Extinguisher Cables FPL-FPLP (CI), NPLF - NPLFP (CI) - (Article NEC 760) Fire extinguishing circuits and cables are classified as restricted or non-restricted. Cables for other types of circuits may be classified later (CI), indicating that they have met the conditions to ensure that critical circuits continue to operate for a specified period of time under fire conditions. Power-Limited-Fire (PLFA) Fire Alarm Circuits are fire alarm circuits that conform to a source that complies with 760.121 (listed PLFA or Class 3 transformer, PLFA or Class 3 power supply, listed source for PLFA power source identification. )

As in fiber optic and communication cables, PLFA firefighting cables are also more marked due to their fire emission potential, indicating the areas of use. There is also a hierarchy of permissible replacements for cables used in low-power circuits, including communication cables.


FPL-FPLP cables are solid or filament copper. Multiconductors cannot be less than 26 AWG. Single conductors cannot be less than 18 AWG. FPL cables must not have a voltage insulation of at least 300 volts. Limited power fire extinguishers are not permitted to be housed in cable trays with electric light, electricity, Class 1, limited fire extinguishers and medium power broadband communication circuits unless they are separated . You cannot install [760.139 (D), 640.9 (C) audio system circuits (using Class 2 or Class 3 wiring methods) on the same cable or rail with a PLFA conductor or cable.

NEC Table 760.154 Applications of PLFA Cables Listed in Buildings - Application details for each type of PFLA cable including applications that cable trays may be used indoors and which types of cable may be in trays Cables to be used. In summary:


* Example - Hanging ceiling space used for transportation purposes peripheral area.

Note: Where applicable, cables and cable trays should comply with the procedures
Installation Described in 760.130 and 760.145.
Non-power-limited fire-extinguishing circuits (NPLFAs) are fire alarm circuits using a source that complies with NEC 760.41 and 760.43 (the power supply must not exceed 600 volts and must contain OCPD). They should not exceed 7A, 18 AWG or 10A for 16 AWG conductors. You must place the OCPDs where the conductor receives it.)

Like communications, fiber optic cables and PLFA cables, NPLFA fire extinguishing cables are also more specific in terms of their fire propagation potential, indicating the areas of use.
Table 760.176 (G) NPLFA cable marks


Note that non-conductor multi-conductor alarm circuits, NPLFP, NPLFR and NPLF types should not be exposed in the air ducts.

Fireproof cables are limited to non-power, as well as solid or filament copper. 18 AWG sizes and 16 AWG conductors are permitted to be used provided they withstand loads not exceeding 6A for 18 AWG and 8A for 16 AWG conductors. Conductors larger than 16 AWG shall not, if necessary, have loads greater than those specified in NEC 310.15.

The NPLFA and Class 1 fire alarm circuits are permitted to occupy the same cable, enclosure, or dirt road provided all conductors are insulated to the maximum voltage of each conductor in the enclosure or freeway. If connected to similar equipment, power supply and NPFLA circuits are allowed in the same cable, enclosure or freeway.

When installing in cable trays, the fire circuit conductors as well as any tray cable shall comply with NEC Article 392 cable trays. Specifically in sections 392.22 (number of conductors), 392.60 (ground connection and connection) and section 392.80 (capacitors amp).

Although less commonly used, several other types of cables may be installed in cable trays. These include AC, CATV, NM, NMC, NMS, SE, USE and UF types. As with the cables discussed in this bulletin, users should refer to the relevant NEC article for proper wiring methods for each type of cable.

Section 392.10 (A) also allows different roads of other roads to be installed in the cable tray, namely EMT, RMC and PVC channels. However, in general these types of travel are usually economically supported with stroof products rather than cable trays.
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