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Fuse, Semiconductor Type
(
UL 508A, Part 1, Introduction, 2) Fuses developed for protecting semiconductor
devices. Can protect motor circuits containing frequency inverters (Low Voltage
Fuses - Part 13: Semiconductor Fuses, UL 248-13).
Fuse, Supplementary Type
(
UL 508A, Part 1, Introduction, 2) Various different fuses and device protection fuses
(
fine-wire or micro fuses). Can be used only in addition to branch circuit protective
devices.
General Use Rating
(
UL 508A, Part 1, Introduction, 2) Rated operational data expressed in V and A and
assigned to a device designed for switching a load with a continuous current or
peak inrush current whose rated values do not exceed the device’s rated operation-
al current.
With AC the load can have a power factor between 0.75 and 0.8 (inductive).
With DC the load must be resistive (non-inductive).
Industrial Machinery (Machine)
(
NFPA 79, Chapter 3) Powered machine (or group of machines that work together in
a coordinated fashion) that is not portable while in operation and which is used to
process material by cutting, forming, pressing, by electrical, thermal or optical
means, coating or through a combination of these processes. The machine can in-
clude associated equipment used for material transport, tool provision, securing,
joining, disassembling, inspection or testing, or packaging. (The full associated
electrical equipment, including software, sensors and actuators, is to be regarded
as part of the machine.)
Industrial Manufacturing System
(
NFPA 79, Chapter 3) Systematic arrangement of one or more industrial machines
that is not transportable by hand and which encompasses conveying of the associ-
ated material, processing, calibration, measurement, or inspection and testing
equipment.
Interrupting Rating
(
NEC, Article 100) The highest current at rated operating voltage which the device
is designed to interrupt under standard test conditions.
Labeled
(
NEC, Article 100) Apparatus or materials with applied markings, symbols or other
identification signs of organizations that are acceptable for AHJs are termed
“
labeled”. The term “labeled” includes the inspection and testing of products as
well as periodic inspection of their production. With labeling the manufacturer
indicates the product’s conformance with applicable standards or its production by
defined means.
Listed
(
NEC, Article 100) Apparatus, materials or services contained in a list published by
an organization that is acceptable for AHJs and which confirms that the products
or services have been tested and that the production of the listed products or
performance of the listed services is subject to periodic investigation. The listing
verifies that the products, materials or services comply with the applicable stan-
dards or that they have been tested and deemed suitable for specific purposes.
Load
(
UL 508A, Part 1, Introduction, 2) Device (load) that is connected with the main
circuit outside the indust-rial control panel.
Low-Voltage Limited Energy Circuit
(
UL 508A, Part 1, Introduction, 2) Control circuit with a peak voltage in the open cir-
cuit of not more than 42.4 V (DC or peak). Is supplied from a battery or an insulated
secondary circuit whose current is limited by an overcurrent protective device. This
can be a fuse, the power of a transformer’s secondary side, or a power supply unit,
a secondary winding and an impedance.
A current being tapped by a mains voltage circuit through a resistor, and which is
intended to limit the current and voltage in a series connection with power supply
circuit is not regarded as low-voltage limited energy circuit.
Mandatory Rules
(
NEC, Article 90) Mandatory rules in the Code, which identify actions that are
specifically prescribed or prohibited. Identified with the terms "shall" or "shall not".
Motor Starter
(
UL 508A, Part 1, Introduction, 2) Combination of a contactor and an overload relay.
Overcurrent
(
NEC, Article 100) Any current exceeding the rated current of apparatus or the load
rating of cables. The overcurrent can result from an overload, a short circuit or a
ground fault.
Overload
(
NEC, Article 100) Operation of equipment above its normal full-load rating or the
rated capacity of cables. If the overload condition persists for a certain time,
damage or dangerous heating occurs. Faults such as short circuits or ground fault
are not over-loads.
Permissive Rules
(
NEC, Article 90) Rules in the Code, which identify actions that are allowed but are
not mandatory. They normally describe options or alternative methods. Identified
with the terms "shall be permitted" or "shall not be required".
For further definitions see Article 100, Definitions, of the National Electrical Codes
of the USA (NEC, NFPA 70), Standards NFPA 79, Chapter 3 and UL 508A.
Pilot Duty Rating
(
UL 508A, Part 1, Introduction, 2) Rated values assigned to a relay or auxiliary
contact that actuates the coil of another relay or switchgear.
Power Circuit
(
UL 508A, Part 1, Introduction, 2) Conductors and components of branch circuits
(
load branch circuits) or feeder circuits.
Self-Protected Combination Motor Controller
(
UL 508A, Part 1, Introduction, 2) Combination motor controller incorporating
coordinated short-circuit and overload protection, an isolating function and a
remote-controllable motor switch (e.g. a contactor). If it does not already exist,
coordinated protection must be implemented through the correct selection of
components or additional parts according to the manufacturer’s instructions.
Shall
(
NFPA 79, Chapter 3) Mandatory condition.
Short-Circuit Current
(
NFPA 79, Chapter 3) Overcurrent resulting from a short-circuit, which, in turn, is
caused by a fault or a faulty connection in an electrical circuit.
Short-Circuit current rating (SCCR)
(
NEC, Article 100) Prospective symmetrical fault current at nominal voltage at which
a device or a system can be connected without incurring damage that exceeds
defined acceptance criteria.
Should
(
NFPA 79, Chapter 3) Identifies a recommended characteristic that is not mandatory.
Supplementary Overcurrent Protective Device
(
NEC, Article 100) Device intended to provide limited overcurrent protection for par-
ticular applications and apparatus, such as lighting and non-industrial consumers.
This limited protection is provided in the load circuit in addition to the protection
provided by the branch circuit protective device (BCPD).
Supplementary Protection
(
UL 508A, Part 1, Introduction, 2) Device arranged behind a branch circuit protection
device to provide additional protection. Such devices are not, themselves, regarded
as branch circuit protective devices (BCPD).
Voltage, Nominal
(
NEC, Article 100) Rating assigned to a circuit or system to indicates its voltage in a
suitable manner (e.g. 120/240 V, 480Y/277 V, 600 V). The actual voltage with which
the circuit works may deviate from the nominal voltage within a range that permits
satisfactory operation of the equipment.
Glossary of terms
Selected terms from the codes & standards of the USA