Sealed Transformer - Completely sealed from
outside atmosphere and usually contains an inert gas which is slightly
Secondary Taps - Taps located in the secondary
winding (see definition for Tap).
Secondary Voltage Rating - Designates the load
circuit voltage for which the secondary winding (winding on the
output side) is designed.
Secondary Winding - The transformer winding connected
to the load or output side.
Separate Built-In Cooking Unit - A stationary
cooking appliance, including its integral supply leads or terminals
and consisting of one or more surface elements or ovens, or a combination
of these, constructed so that the unit is permanently built into
a counter or wall.
Series/Multiple - A winding of two similar coils
that can be connected for series operation or multiple (parallel)
Service, Consumer's - All that portion of the
consumer's installation from the service box or its equivalent
up to and including the point at which the supply authority makes
Service, Supply - Any one set of conductors run
by a supply authority from its mains to a consumer's service.
Service Box - An approved assembly consisting
of a metal box or cabinet constructed so that it may be effectually
locked or sealed, containing either service fuses and a service
switch or a circuit breaker, and of such design that either the
switch or circuit breaker may be manually operated when the box
Service Room - A room or space provided in a
building to accommodate building service equipment, and constructed
in accordance with the National Building Code of Canada, or applicable
Shockproof as Applied to X-Ray and High-Frequency Equipment -
Means hat the equipment is guarded with grounded metal so that
no person can come into contact with any live part.
Short-Time Duty - see definition for Duty.
Signal Circuit - Any electrical circuit, other
than a communication circuit, which supplies energy to a device
which gives a recognizable signal, such as circuits for doorbells,
buzzers, code-calling systems, signal lights, and the like.
Sine Wave - The waveform produced by rotating
a loop of wire at uniform speed in a magnetic field and measuring
the voltage that is induced, along with the angular displacement
of the wire.
Single Dwelling - A dwelling unit consisting
of a detached house, one unit of row housing, or one unit of a
semi-detached, duplex, triplex, or quadruplex house.
Single Receptacle - see definition for Receptacle.
Slow-Burning as Applied to Conductor Insulation -
Means the insulation has flame-retardant properties.
Slow speed Ratio - A speed ratio of melting characteristics
from 10-13 (see Speed Ratio).
Solar Photovoltaic Systems - the total components
and subsystems that in combination convert solar energy into electrical
energy suitable for connection to a utilization load.
Special terminology and general system components:
AC Module - a complete, environmentally protected
assembly of interconnected solar cells, inverter, and other
components designed to generate ac power.
Array - a mechanical integrated assembly of modules or
panels with a support structure and foundation,
tracking, and other components as required, to form a power producing
Interconnected System - a solar photovoltaic
system that operates in parallel with, and that may deliver
power to, another system such as a supply authority system.
Module - the smallest complete, environmentally protected
assembly of interconnected solar cells.
Panel - an assembly of modules, mechanically fastened together
and prewired to form a self-contained unit.
Photovoltaic Output Circuit - circuit conductors
between the photovoltaic source circuit(s) and the power
conditioning unit or direct-current utilization equipment.
Photovoltaic Power Source - an array or aggregate
of arrays that generates direct-current power at system
voltage and current.
Photovoltaic Source Circuit - conductors between
modules and from modules to the common connection
point(s) of the direct-current system.
Power Conditioning Unit - equipment that is
used to change voltage level or waveform, or otherwise alter
or regulate the output of a photovoltaic power source.
Power Conditioning Unit Output Circuit - conductors
between the power conditioning unit and the
connection to the service, distribution, or utilization equipment.
Solar Cell - the basic photovoltaic device
that generates electricity when exposed to light.
Soldered - A uniting of metal surfaces by the
fusion thereon of a metal alloy, usually of lead and tin.
Sparkover - A disruptive discharge between electrodes
of a gapped protective device.
Spas - see definition for Pools, Tubs, and Spas
Special Permission - The written authority of
the inspection department.
Specialty Arrester - An arrester designed specifically
for a particular application to meet the specified needs of that
application. Riser pole and under-oil are specialty arrester.
Speed Ratio - A ratio given for the time current
characteristics of fuse links; the ratio of the 0.1 second minimum
melting current to the 300 or 600 second melting current (300 seconds
for fuse links rated 100A and less, 600 seconds for 140 and 200
Split Receptacle - see definition for Receptacle.
Splitter - An enclosure containing terminal plates
or busbars having main and branch connectors.
Starter - A controller for accelerating a motor
from rest to normal speed and for stopping the motor, and usually
implies inclusion of overload protection.
Steady State - A condition in which circuit s
values remain essentially constant, occurring after all initial
transients or fluctuating conditions have settled down.
Stress, Voltage - A transient current of voltage
usually associated with lighting or switching.
Submersible Pump - a pump-motor combination where the enclosed
electrical equipment is intended to
operate submerged in water.
Supply Authority - Any person, firm, corporation,
company, commission, or other organization supplying electric energy.
Surface Raceway - A surface mounted or pendant
enclosure, consisting of one or more channels for the purpose of
containing and protecting conductors and intended to accommodate
associated fittings, wiring devices, luminaires, and accessories.
Surge - Transient current or voltage associated
with lightning or switching.
Switch - A device for making, breaking, or changing
connection in a circuit:
General use Switch - A switch intended for use in general distribution
and branch circuits. It is rated in amperes and is capable of
interrupting its rated current at rated voltage.
Indicating Switch - A switch of such design or so marked that
the fact as to whether it is "on" or "off" may
be readily determined by inspection.
Isolating Switch - A switch intended for isolating either a
circuit or some equipment from its source of supply. It is not
intended either for establishing or interrupting the flow of
current in any circuit.
Motor-Circuit Switch - A manually operated knife or snap switch
rated in horsepower fused or unfused.
Switch, Limit - A switch that is operated by
some part or motion of a power-driven machine or equipment to alter
the electric circuit associated with the machine or equipment.
Switchboard - A panel or assembly of panels on
which is mounted any combination of switching, measuring, controlling,
and protective devices, buses, and connections, designed with a
view to successfully carry and rupture the maximum fault current
encountered when controlling incoming and outgoing feeders.
Switchgear - A general term covering switching
and interrupting devices and their combination with associated
control, metering, protective and regulating devices; also assemblies
of these devices with associated interconnections, accessories,
enclosures and supporting structures, used primarily in connection
with the generation, transmission, distribution and conversion
of electric power.
Switchgear Assembly - An assembled piece of switchgear
equipment (indoor or outdoor) including but not limited to one
or more of the following: switching; interrupting; control; metering;
protective and regulating devices, together with their supporting
structures; enclosures; conductors; electric interconnections and
Symmetric - A term used to explain the normal,
rhythmic ac flow of current (transient or dc component = ); the
steady state component of any current or fault current calculation.
System Capacity - Represents the ability of a
system to meet its customer's needs, or the electrical demand of
its customer. System capacity is provided by generators, transmission
lines, distribution networks and load management.
System Voltage - The rms power frequency voltage
from line-to-line as distinguished from the voltage from line-to-neutral.