Padmount Transformer - A transformer designed
for mounting on a concrete pad with underground connecting cables.
Panelboard - An assembly of buses and connections,
overcurrent devices and control apparatus with or without switches,
or other equipment constructed for installation as a complete unit
in a cabinet.
Panelboard, Enclosed - An assembly of buses and
connections, overcurrent devices and control apparatus with or
without switches, or other equipment installed in a cabinet.
Park Model Trailer - a recreational vehicle
unit that meets the following criteria:
- it is built on a single chassis mounted on wheels;
- it is designed to facilitate relocation from time to time;
- it is designed as living quarters for seasonal camping and
may be connected to those utilities necessary for
operation of installed fixtures and appliances; and
- it has a gross floor area, including lofts, not exceeding
50 m2 when in the set-up mode, and having a width
greater than 2.6 m in the transit mode.
Part-Winding Start Motor - A motor arranged for
starting by first energizing part of its primary winding and, subsequently,
energizing the remainder of this winding in one or more steps,
both parts then carrying current.
Peak Demand - The maximum integrated demand during
a time period.
Peak Line Current - Maximum instantaneous current
during a cycle.
Percent IR (%IR) - The voltage drop due to conductor
resistance at rated current expressed in percent of rated voltage.
Percent IX (%IX) - The voltages drop due to reactance
at rated current expressed in percent of rated voltage.
Percent IZ (%IZ) - The voltage drop due to impedance
at rated current expressed in percent of rated voltage.
Periodic Duty - see definition for Duty.
Permanently Connected Equipment - Equipment that
is electrically connected to the supply by means of connectors
that can be accessed, loosened, or tightened only with the aid
of a tool.
Permit - The official written permission of the
inspection department, on a form provided for the purpose, authorizing
work to be commenced on any electrical installation.
Phase - Classification of an ac circuit usually
single-phase, two wire or three wire; two-phase, three wire or
four wire; or three-phase, three wire or four wire.
Photovoltaic - see definition for Solar Photovoltaic Systems
Plenum - A chamber associated with air-handling
apparatus for distributing the processed air from the apparatus
(supply plenum) to the supply ducts or for receiving air to be
processed by the apparatus (return plenum).
Pools, Tubs, and Spas -
Special terminology and types:
Decorative Pool - a pool that could be used as a wading
pool, that is larger than 1.5 m in any dimension, and
that is readily accessible to the public.
Dry-niche Luminaire - a luminaire intended for installation
in the wall of the pool in a niche that is sealed
against the entry of pool water by a fixed lens.
Forming Shell - a structure intended for mounting in a
pool structure to support a wet-niche luminaire
Hydromassage Bathtub - a permanently installed bathtub
having an integral or remote water pump or air
blower, and having a fill and drain water system, and includes
Leakage Current Collector - a device designed to provide
a path to ground for leakage current originating
from devices in contact with pool water.
Permanently Installed Swimming Pool - a pool constructed
in such a manner that it cannot be
disassembled for storage.
Spa or Hot Tub - a pool or tub designed for the immersion
of persons in heated water circulated in a closed
system incorporating a filter, heater, pump, and with or without
a motor-driven blower but not intended to be
filled and drained with each use.
Storable Swimming Pool - a pool constructed in such a manner
that it may be readily disassembled for
storage and reassembled to its original integrity.
Wet-niche Luminaire - a luminaire intended for installation
in a forming shell mounted in a pool structure
where the luminaire will be completely surrounded by pool water.
Portable as Applied to Electrical Equipment -
The equipment is specifically designed not to be used in a fixed
position and receives current through the medium of a flexible
cord or cable and usually an attachment plug.
Portable Ground Fault Circuit Interrupter - A
ground fault circuit interrupter which is either of the direct
plug-in type or specifically designed to receive current by means
of a flexible cord or cable and an attachment plug and which incorporates
one or more receptacles for the connection of equipment which is
provided with a flexible cord or cable and an attachment plug.
Power Fuse - A power fuse (expulsion and current-limiting)
has high voltage ratings of 2.8-167 kV and x/r ratios of 15-25.
Power Follow Current - Refer to Follow Current.
Power-Frequency Withstand Voltage - A specified
rms test voltage at power frequency that will not cause a disruptive
Power Outage - An interruption of power.
Power Supply Cord - An assembly consisting of
a suitable length of flexible cord or power supply cable provided
with an attachment plug at one end.
Primary Taps - Taps added in the primary winding
(see definition for Tap).
Primary Voltage Rating - Designates the input
circuit voltage for which the primary winding is designed.
Primary Winding - A winding connected to the
voltage source or input.
Propane Dispensing and Storage (see also Hazardous
Locations) - locations where propane is dispensed or transferred
to the fuel tanks of
vehicles or to portable containers and to locations where propane
is stored or transferred from rail cars
or tanker vehicles to storage containers.
Refill Centre - a facility such as a propane service
station that is open to the public and where
propane is dispensed into containers or the fuel tanks of motor
vehicles and that consists of propane storage
containers, piping, and pertinent equipment including pumps
and dispensing devices.
Filling Plant - a facility such as a bulk
propane plant, the primary purpose of which is the distribution
propane, that receives propane in tank car or truck transport
for storage and/or distribution in portable containers
or tank trucks, that has bulk storage, and that usually has
container filling and truck loading facilities on the
Propane - any material that is composed predominantly
of the following hydrocarbons either by themselves
or as mixtures: propane, propylene, butane (normal butane or iso-butane),
Protected as Applied Mainly to Electrical Equipment -
The equipment is constructed so that the electrical parts are protected
against damage from foreign objects entering its enclosure.
Puncture - Term used when a disruptive discharge
occurs through a solid dielectric. A disruptive discharge in a
solid dielectric produces a permanent loss of dielectric strength;
in a liquid of gaseous dielectric, the loss may be only temporary.
PVC Conduit - see definition for Conduit.
Qualified Person - One familiar with the construction
and operation of the apparatus and the hazards involved.