UNDERSTANDING SHIELDED CABLE....for your philippine electrical concerns...needs...installation...orders...safeelectrical2013@gmail.com

Understanding Shielded Cable
Industrial applications such as the factory floor are typically electrically noisy environments.
Electrical noise, either radiated or conducted as electromagnetic interference (EMI), can
seriously disrupt the proper operation of other equipment. Insulation protects a cable
mechanically from scraps and abrasion and environmentally from moisture and spills. But
insulation is transparent to electromagnetic energy and offers no protection. Shielding is needed
to combat the effects of EMI.
Cables can be a main source of transfer for EMI, both as a source and receiver. As a source, the
cable can either conduct noise to other equipment or act as an antenna radiating noise. As a
receiver, the cable can pick up EMI radiated from other sources. A shield works on both.
The table below gives general guidelines as to the areas which are subject to these generalized
noise levels. Notice that switching heavy loads, inductive heaters, large transformers can all
present high levels of both conducted and radiated EMI.
Placing signal cables next to power cables can also allow power-line noise to couple onto the
signal lines.
Noise Level Noise Source Typical Locations
High Electrolytic processes, heavy motors, generators,
transformers, induction heating, relay controls,
power lines and control wire in close proximity
Heavy processing plants such as steel
mills and foundries
Medium Wiring near medium-sized motors, control relays Average manufacturing plants
Low Wiring located far from power lines, motors; motors
<5 hp; no induction heating, arcs, control or power
relays nearby
Storage areas, labs, offices and light
assembly operations
The primary way to combat EMI in cables is through the use of shielding. The shield surrounds
the inner signal- or power-carrying conductors. The shield can act on EMI in two ways. First, it
can reflect the energy. Second, it can pick up the noise and conduct it to ground. In either case,
the EMI does not reach the conductors. In either case, some energy still passes through the
shield, but it is so highly attenuated that it doesn’t cause interference.
Cables come with various degrees of shielding and offer varying degrees of shielding
effectiveness. The amount of shielding required depends on several factors, including the
electrical environment in which the cable is used, the cost of the cable—why pay for more
shielding than you need?—and issues like cable diameter, weight, and flexibility.

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