Tray Instrumentation Control THHN/PVC Triads Overall Shield (TOS) 600V
THHN/PVC Triads is a special Instrumentation control cable that is suitable for 600V rated utilities. You can use it to establish an electrical circuit for your unit and it will never fail you. The cable has top notch design, which qualifies it for use in both domestic, commercial and industrial applications. Many equipment and machines are wired using Tray Instrumentation Control THHN, thanks to its rare and appraisable properties.
It is constructed using stranded bare copper conductor. This conductor is designed into various sizes ranging from 18 AWG to 10 AWG with three conductors in each cable. Copper as the cables conductor provides good electrical conductivity, reliable strength and resilience. This copper conduction has been designed in tandem with the ASTM B-3 and B-8 provisions.
Cross-linked Polyethylene material constitutes the cable’s insulation system. This material is flame retardant protecting both the conductors and the circuits from fires. Such a sturdy and integral insulation system promotes the cable’s service life and longevity to control and instrumentation units.
A strong Polyvinyl Chloride (PVC) material forms the stable jacket that operates as the additional security feature. The jacket is resistant to moisture and sunlight, making the cable usable in outdoor applications.
Tray Instrumentation Control Cable is designed for use in conduit, cable tray and burial installations, which implies that it can be applied for both outdoor and indoor activities. It is approved for Class 1 Division 2 hazardous locations according to NEC Article 501 (TC). The cable is recommended for applications such as control, power lighting and telemetering in instances where heat and an electrically stable insulation is needed.
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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.