Price (Per FT.)
CONDUCTOR: 20 AWG - 18 AWG Class B stranded bare copper per ASTM B-3 and B-8
INSULATION: Premium Grade Polyvinyl Chloride (PVC)
COLOR CODE: Black/White/Red; Alpha-numeric print; alternate & inverted
COMMUNICATIONS CDR. 22 AWG PVC (Orange) Communications Conductor included.
SHIELDING Individual and overall 100% coverage, aluminum/polyester foil shield
JACKET: Black sunlight and moisture resistant Polyvinyle Chloride (PVC)
TEMPERATURE RANGE: -30°C to 90°C
SUNLIGHT RESISTANT: Yes
VOLTAGE RATING: 300V rms, Max
- UL Standard 13 Type PLTC
- UL Standard 2250 Type ITC
- NEC Article 336
- Passes FT4/IEEE 1202 Flame Test
- Passes IEEE 383 Flame Test (70,000 btu)
- EPA 40 CFR, Part 26, Subpart C, heavy metals per Table 1, TCLP method
What are the common characteristics of shielded tray shielded triad overall shield cables?
These cables have the red, black and white conductors bound together with a shield which forms a triad. A cable may have many such triads which may then be numbered and the triads are totally isolated from each other with a drain wire for grounding. The triads are covered with an overall foil shield which can be made of aluminum or polyester.
What are the common places where you can see the use of shielded tray shielded triad overall shield cable?
These types of cables are generally used where there has to be maximum noise rejection such as instrumentation applications and many other purposes. So as such you can be sure to see them used in heavy processing plants where the noise level will be really high. They are also used in manufacturing plants, storage areas, offices and labs where you can find medium to low levels of noise.
What is the shield made up of?
The shield will usually be any of the following
- A wire mesh which might be made up of braided strands of metal, usually copper or aluminium.
- A foil or a spiral winding tape
- A layer of conducting polymer
The shield is then covered with an overall jacket which can be made of PVC or EPR.
Why should I go in for a shielded cable?
You can use unshielded ones as well as shielded ones without any noticeable difference in the performance of the cable. However, when there is a lot of electrical noise which is conducted as EMI or electromagnetic interference, then shielded cables are used. Insulation alone will not offer you protection against EMI. A shield will surround the conductors effectively so that they will not detect any EMI and therefore, will not transfer or absorb EMI. Furthermore, shields protect the cable, people and also any equipment to which it might be connected.
Can I use a shielded cable to connect equipment from two different circuits?
When you connect equipment from two different circuits, there might be some grounding issues as it can form a ground loop. However, when the ground voltage difference is minimal, there is no need to worry. In case it is high, it can damage the system, but you can terminate one end of the shielded cable using a connector which is non-shielded. However, this causes a floating shield and if this picks up additional noise, you will have to do proper grounding at both ends.