Page 40


www.us-tech.com


May, 2017


Setting the Standard for Tray-Rated Fiber Optic Cable


Continued from page 38


any comparable requirements for fiber. The only mention is in Article 770, which states, “Fiber cables shall be permitted to be installed in cable trays.”


This generalized statement is


far from sufficient, given that fiber optic cable must stand up to most of the same environmental risks and dangers. This is driving the efforts of


manufacturers such as OCC to estab- lish specific benchmarks for fiber optic tray cable, backed by third- party verification testing. According to Miller, there are


some minor variations in the stan- dards, because of the differences be- tween copper and fiber. For example, crush and impact ratings for metallic cables are slightly higher due to con- cern that damaged insulation could lead to a short that causes a fire. If fiber is crushed, the consequence is merely attenuation or loss of signal. Another shift is in the require-


ment that tray-rated cable in all its forms invariably includes a copper power conductor. Although compa- nies such as OCC offer a hybrid prod- uct that combines fiber with a copper wire to deliver the same 600V as TC, new options include fiber optic tray cables (FOTC) with no power conduc- tor.


There are several reasons for 12:59 PM


this, including that the insulation on copper wiring often must meet differ- ent requirements than the jacketing for fiber. Specifying each separately can also reduce costs.


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five essential requirements: resist- ance to impact, crush, UV rays, ex- treme temperature, and fire.


Jacketing Options As with traditional copper TC,


much of the mechanical performance for fiber optics is derived from its jacketing. This can range from plas-


Continued on next page “For most applications, it is


more cost-effective to provide power and tray fiber through separate ca- bles, because there are many config- urations that require different jack- ets,” says Miller. Power element or not, Miller adds that the cable will have to meet


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