Choosing Electrical Boxes for Extreme Environments
According to OSHA, most electrical hazards in the workplace exist due to faulty equipment, unsafe work practices, or
hazardous environments. While faulty equipment can be repaired and employees
can be trained in safe workplace practices, some facilities and worksite are
inherently hazardous to people, processes, and equipment.
An extreme work
environment is typically associated with hot processes (i.e. metals refining),
corrosive environments, dangerous tasks, wet processes, and just about all
outdoor electrical installations and workplace operations that are exposed to
extreme climates. This includes extremely high or low temperatures, high
humidity, and heavy rain, sleet, or hail.
Electrical boxes for extreme conditions
Fiberglass Electrical Boxes
Electrical contractors
are choosing fiberglass electrical boxes over metal because they are highly
resistant to chemical attack and degradation and fiberglass is a non-corrosive
material. Fiberglass is a silicate fiber that has glass as its main component.
The material is already used for high-end residential architectural components
and insulation because it reduces the spread of cold, heat, and sound in
aircraft, cars, and structures.
Fiberglass electrical
enclosures have a temperature range of -40C to 121C, are ideal for wet or
corrosive environments, and they maintain excellent electrical properties.
Fiberglass electrical boxes are used to reduce the failure of sensitive
electronics because the boxes are non-conductive and are not affected by radio
frequencies.
Choose fiberglass for
outdoor environments. The material is an excellent choice for solar
installations because it does not absorb or hold water, and it stands up
extremely well to UV radiation
Polycarbonate Electrical
Boxes
Electrical engineers view
polycarbonate electrical boxes as a light weight, cost-effective, and durable
choice over metal for food processing installation and other wet or outdoor
environments. Metal electrical boxes dent, rust, corrode, and lose their finish
in these environments. Polycarbonate is a type of thermoplastic that is easy to
field modify.
When exposed to UV light,
polycarbonate does not weaken, holds its shape, and will not discolor. For
environments like agricultural and marine that are continuously exposed to
sunlight and moisture, polycarbonate is the material of choice. Expect an
electrical enclosure that stands up well to impact up to 900psi.
Fiberglass versus Polycarbonate
While both materials are
excellent choices for electrical boxes and both are comparably priced, there
are design considerations that may preclude one over the other.
Fiberglass enclosures
have a thicker wall, are typically stronger than polycarbonate, and will
feature a nicer finish. The glass fibers added to this material create a box
that is crack-resistant, making it appropriate for busy factory environments.
Fiberglass is the perfect composite material for electrical boxes that must
maintain dimensional stability and high strength in extreme environments.
Polycarbonate enclosures
are 40% lighter in weight when compared to fiberglass (which can save on
shipping costs and installations). UV inhibitors are often a part of the
polycarbonate formulation, making them a great choice for outdoor mounting.
Polycarbonate is also less brittle and highly resistant to impact.
Visit Allied Moulded
Products Inc. for a wide range of
fiberglass and polycarbonate electrical boxes and accessories for industrial
and residential applications.
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