EE mod 2

Underground or overhead conductors carry power from the transformer through a metering device to the building’s service disconnects. It includes the components that connect the utility-supplied wiring (the service lateral or service drop) to the service disconnect, excluding the utility’s metering equipment.

• Service entrance

• Service exit

• Service drop

• Service loads

Overhead wires extend from a pole-mounted distribution transformer to  the building’s service entrance.

• Service drop

• Service load

• Service entrance

• Service disconnect

an instrument that is used by the utility company to measure  and record electrical energy consumed

• Fuse

• Metering

• Feeting

• Switchgear

A large cabinet or assembly of metal cabinets in which is  connected disconnecting switches, overcorrect protection devices (fuses  or circuit breakers), other protective devices, and instruments designed  to divide large amounts of electrical current into smaller amounts of  current used by electrical equipment.

• Metering

• Switchgear

• Breaker

• transformer

Transforms supplied power  into usable voltages. Typically,  rated in kVA.

• Power Transformer

• Resistance Transformer

• Metered Transformer

• Energy Transformer

Power transformer that has a secondary voltage that is less than its primary voltage.

• Step up

• Step down

• Step in

• Step out

Power transformer has a secondary voltage that is greater than its primary  voltage

• Step up

• Step down

• Step in

• Step out

Overcurent protection safeguards the building service or an individual circuit from excessive current flows

• true

• false

Meters and circuit breakers serve as automatic overcurrent protection devices. They are designed to open a circuit if the  amount of current that flows through the circuit  exceeds its rating.

• true

• false

Answer explanation

Fuses and Circuit breakers

Serves as a switch that can be opened and  closed manually, and most importantly, it automatically “trips off”, which opens or  interrupts the circuit when current flowing through it exceeds the circuit rating. Once it  trips, it can be reset (closed like a switch) and will continue to allow electricity flow as  long as the current flowing through it does not exceed the circuit rating.

• Circuit Breaker

• fuse

• capacitor

• power transformer