What is cable Type TC?

What is cable Type TC?

Type TC – Tray Cable – (NEC Article 336) –Power and control tray cable type TC is a factory assembly of two or more insulated conductors, with or without associated bare or covered grounding conductors, under a non-metallic jacket. If identified for such use TC cables may be also be used for direct burial.

What are fire alarm cables?

These cables are used in high rise buildings, commercial complexes, schools and educational institutions, hospitals, etc. for the connection with security systems like smoke detectors, emergency lightings, exit signboards and fire command center.

What happens when you overload trays?

Overloading cable trays can lead to a breakdown of the tray, its connecting points, and/or supports, causing hazards to persons underneath the cable tray and even leading to possible electric shock and arc- flash/blast events from component failure when the cables are suddenly no longer sup- ported.

Does cable tray need to be accessible?

Answer: The NEC does not have a specific installation clearance, but indicates in section 318-6(b) that cable trays should be exposed and accessible. Telecommunications standard TIA/EIA-569 recommends a minimum of 12-inch access headroom above the cable tray.

Is Thhn allowed in cable tray?

Cable tray is classified by the NEC (NFPA 70 the National Electrical Code) as a support system and not as a raceway. Cable types that are not presented in the table include single-conductor building wire types such as THHN/THWN, XHHW and RHH/RHW.

What is FAS cable?

Designed for use in the interconnection of security system elements; including fire protective signaling devices such as smoke detectors, fire alarms and two way emergency communication systems.

What increases the flexibility of a wire?

Most industrial wire is made up of multiple wire strands, called ‘base strands’, rather than being made of a solid piece of metal. Multiple strands make the wire more flexible, allowing it to bend and flex more easily than solid metal. The finer the base strand, the more flexible the wire.

Can you walk on cable tray?

Answer:No; walking on cable trays is not to be permitted. Walking on electrical equipment, conduits, cables or other electrical systems should also be avoided. In addition to the fall hazard, there is the risk of damage to equipment and possible contact with conductors.

Can you stack cables in cable tray?

Cables 250 kcmil to 1000 kcmil are not required to be installed in a single layer and are permitted to be stacked in multiple layers or bundled. For this reason Table 392.10(A) is used to determine cable tray width.

What does TC ER mean on a cable?

The new rating was created for Type TC (tray cables), Type ITC (instrumentation tray cables) and Type PLTC (power-limited tray cables). If these cable types meet certain additional crush and impact test requirements, UL permits the manufacturer to add an “-ER” suffix to the basic listing printed on the cable, i.e., “TC-ER”, “ITC-ER” or “PLTC-ER”.

What is the purpose of the TC rating on cable?

It can be used when dropping out of cable tray to equipment or devices, and also where dropping from tray to tray. The intent of Sec. 336.10 (7) of the 2014 National Electrical Code (NEC), and its corresponding Exception, is to make it clear that cable with only a TC rating cannot be run unprotected outside a raceway or cable tray.

Can ititc cables be used with Class 1 circuits?

ITC cables may not be installed with power, lighting, Class 1 circuits that are not power limited, or non-power limited circuits unless they have a metallic sheath and or are terminated within equipment or junction boxes or separations are maintained by insulating barriers.

What are TCTC tray cables?

TC Tray Cables are installed in cable trays, ducts and conduit; they can also be used in direct burial applications. They are extensively deployed in manufacturing facilities, especially in process industries: petrochemical, steel, pulp and paper, cement and mining.