Chapter 28 Flashcards
The function of a substation includes __________.
receiving voltage and increasing it to an appropriate level
providing a safe point for disconnecting power
providing a place to adjust and regulate outgoing voltage
A(n) __________ is an overcurrent protection device with a link that melts and opens the circuit on an overcurrent condition.
fuse
A(n) __________ connection is made when the three ends of separate phases are connected together, creating a common wire.
wye
A(n) ___________ connection is made when one end of each coil is connected together and the other end of each coil is let open for external connections.
delta
A(n) __________ is a metal-enclosed distribution system of busbars available in prefabricated sections.
busway
A(n) __________ diagram uses single lines and symbols to show flow path, voltage values, disconnects, overcurrent protection devices, transformers, and panelboards in a circuit.
one-line
All transformer installations must follow __________ and NFPA requirements.
National Electrical Code (NEC)
The voltage regulator on a transformer has __________ to allow for a variable output.
taps
NEC Section 450.21 (B) states that all dry-type transformers over 112 1/2 kVA rating shall be installed in a __________ rooms.
fire-resistant
Switchboards are designed for use as __________, distribution, or a combination of both.
service-entrance
Panelboards contain overcurrent protection devices for lighting, appliance, and __________ circuits.
power distribution branch
A(n) __________ is an OCPD with a mechanical mechanism that may manually or automatically open the circuit when an overload condition or short circuit occurs.
circuit breaker
The two basic types of busways are feeder and __________ busways.
plug-in
__________ is the process of delivering electrical power where it is needed.
Power Distribution
Switchboards that have more than __________ switches or circuit breakers must include a main switch to protect or disconnect all circuits.
six
An enclosure should be tested for __________ if voltage is present and at the correct level.
grounding
To meter the incoming power, a switchboard must have a(n) __________ to measure power usage.
watt-hour meter
The capacity of transformers is rated in __________.
Kva or Va
The three main sections of a substation are the primary switchgear, transformer, and __________ sections.
secondary switchgear
Switchboards are rated by the manufacturer for maximum voltage and __________ output.
current
A(n) __________ circuit is the portion of a distribution system between the final overcurrent protection device and the outlet or load connected to it.
branch
A(n) __________ electrode is a conductor embedded in the earth to provide a good ground.
grounding
__________ perform the same function as fuses and are tested the same way.
Circuit breaker
NEC Article 408.15 states that not more than ___________ overcurrent devices for a lighting and appliance panelboard, other than mains, are permitted in one cabinet.
42
A(n) ___________ is the piece of equipment which a large block of electric power is delivered to from a substation and broken down into smaller blocks for distribution throughout a building.
switchboards
A(n) __________ is a wall-mounted distribution cabinet containing a group of overcurrent and short-circuit protection devices for lighting, appliance, or power distribution branch circuit.
panelboard
Fuses can be checked using a(n) ___________ placed across a fuse that has been removed from a circuit.
continuity tester
A(n) __________ receives incoming power and delivers it to the control circuit and motor loads.
motor control center
A(n) __________ is a device that protects transformers and other electrical equipment from voltage surges caused by lightning.
lighting arrester
In a transformer, a marking of X1 or X2 indicates the __________ voltage side.
low
