Transcript Fuse Listing and Labeling

Listing and Labeling
Part I
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Considerations
• When selecting an electrical device it can
often be difficult to determine which is the
best product to use.
• At a minimum, one decision factor to
consider is to use products that are listed to
an industry product standard by a third party
qualified testing laboratory such as
Underwriters Laboratories Inc. or UL.
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What does UL listing mean?
• UL listing is defined by UL as:
– The manufacturer’s representation that
samples of the complete product have
been tested by UL to nationally
recognized Safety Standards and found
to be free of reasonably foreseeable risk
of fire, electric shock and related hazards.
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Benefits of a Listed Device
• Devices can be applied knowing it will meet
the performance criteria of the particular
standard.
• Gives the user peace of mind and assurance
knowing the product will perform as intended
(per the standard’s performance criteria).
• Reduces the liability and risk to the owner or
designer.
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Proper Application
• A device must be applied according to the
standard to which it is listed.
• UL 508 states – A listed device shall:
– Be used as intended by the manufacturer.
– Be installed according to instructions provided
by the manufacturer.
– Not exceed their marked electrical and
environmental ratings.
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Where is it used?
• It is important to note where a device is
being used.
– For example, a UL listed hedge trimmer,
and a UL listed beard trimmer are not
intended for the same use.
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Where is it used?
The electrical location in the circuit is of
equal importance as the physical location.
• For example, in a motor circuit there are
numerous devices that can be used for
various functions.
• Consideration must be given to the type of
device and where it is used in the circuit.
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Determine Correct Use
Two steps to determine the proper use for a device
are as follows.
• Read installation guides such as the National
Electrical Code® or NEC®.
• Read the label – look for markings such as:
– UL marking, voltage marking, ampere rating and
interrupting rating
– Markings to describe the type of device: “Fuse Holder,”
“Misc. Sw.,” “Pullout Switch,” “HACR Type,” “Man. Mtr.
Contrlr.,” or “Suitable as Motor Disconnect.”
– A “special purpose” listing
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Determine Correct Use
• Important Markings on Device
– UL mark is composed of four elements: the “UL” in a
circle, the word “LISTED” in all caps, an alpha-numeric
control number, and the product name.
– Voltage rating: AC or DC
– Ampere rating
– Interrupting rating or short-circuit rating: dependent
upon voltage, i.e. 65kA 480V
– Markings to describe the type of device such as “Fuse
Holder,” “Misc. Sw.,” “Pullout Switch,” HACR Type,”
“Man. Mtr. Contrlr.,” or “Suitable as Motor Disconnect.”
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Determine Correct Use
• Example: Manual Motor Controllers (UL 508)
– May be used as on-off switch to meet NEC Article 420
Part VII.
– Cannot be used as motor disconnecting means per
NEC 430.109.
– If marked as “Suitable as Motor Disconnect” and listed
as a “manual motor controller” it may be used as a
motor disconnect provided it is located between the
final motor branch-circuit short-circuit and ground-fault
protective device and the motor.
– Review of the marking on the device is required to
insure correct use.
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Test Your Knowledge
Q1: What are some of the benefits of a device
that is listed by a qualified test laboratory?
Answer on next page.
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© 2003 Cooper Bussmann, Inc.
Test Your Knowledge
A1: What are some of the benefits of a device
that is listed by a qualified test laboratory?
– Devices can be applied knowing it will meet the
performance criteria of the particular standard.
– Gives the user peace of mind and assurance
knowing the product will perform as intended (per
the standard’s performance criteria).
– Reduces the liability and risk to the owner or
designer.
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© 2003 Cooper Bussmann, Inc.
Test Your Knowledge
Q2: List some of the important markings to look for
on an electrical device.
Answer on next page.
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© 2003 Cooper Bussmann, Inc.
Test Your Knowledge
A2: List some of the important markings to look for
on an electrical device.
– UL mark composed of four elements: the “UL” in a
circle, the word “LISTED” in all caps, an alpha-numeric
control number, and the product name.
– Voltage rating: AC or DC & Ampere rating
– Interrupting rating or short-circuit rating: dependent
upon voltage, i.e. 65kA 480V
– Markings to describe the type of device such as “Fuse
Holder,” “Misc. Sw.,” “Pullout Switch,” HACR Type,”
“Man. Mtr. Contrlr.,” or “Suitable as Motor Disconnect.”
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Test Your Knowledge
Q3: What are the four elements of the UL mark?
Answer on next page.
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© 2003 Cooper Bussmann, Inc.
Test Your Knowledge
A3: What are the four elements of the UL mark?
– The “UL” in a circle
– The word “LISTED” in all caps
– An alpha-numeric control number
– The product name.
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Test Your Knowledge
Q4: Why is it important to read the labels of a
particular device?
Answer on next page.
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Test Your Knowledge
A4: Why is it important to read the labels of a
particular device?
– Review of the marking on the device is required
to insure correct use.
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For more information on this subject see
Listing and Labeling Part II.
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