Glossary

This section will help you in understanding the commonly used electrical terms and definitions:

Alternating Current – A flow of electricity that reaches maximum in one direction, decreases to zero, then reverses itself and reaches maximum in the opposite direction. The cycle is repeated continuously.

Alternator: An electric generator that produces alternating current.

Ambient Temperature – The temperature of the surrounding environment. As per industry standards, it is 25° C.

Ampere (A) – Unit of electrical current flow.

American Wire Gauge (AWG) – A standard measure that represents the diameter of wire. The larger the number, the smaller the diameter of the wire.

Basic Insulation Level (BIL) – A reference insulation level that measures the ability of the insulation to withstand very high voltage surges.

Breakdown Voltage – Voltage at which electrical system fails.

Battery – A group of two or more cells connected together to provide electrical current.

Circuit Breaker – A device that detects excessive power demands in a circuit and self interrupts when they occur. Acts as a preventive device.

Conductor – Any material that allows electricity to flow through it.

CU – Copper

Direct Current (dc) – Constant value current that flows in only one direction.

Dual Voltage Switch – A switch used to change the primary voltage of a transformer.

Device – A unit of an electrical system that is intended to carry but not utilize electric energy.

Energy Saving Devices – Devices designed to make use of energy sources more efficiently while providing heating, cooling, and light.

Fault – A short circuit in an electrical system.

Flicker – Impression of fluctuating brightness or color, occurring when the frequency of the observed variation lies between a few hertz and the fusion frequencies of the images.

Fluctuation – A surge dip in voltage amplitude often caused by load switching or fault clearing.

Fuse – A device that will heat up, melt and electrically open the circuit after a period of prolonged abnormal current flow.

Fuse Clearing Time – The total time taken by the fuse to melt and clear the circuit; melting time plus arching time.

Grounded – Connected to earth or to some other conducting body that serves in place of the earth.

Horsepower – The unit of power. It equals 746 watts.

Insulation – A material or object that has a high resistance to the flow of electric current; insulation over underground conductor is made of either EPR or XLPE material.

Inverter – An electrical device designed to convert direct current into alternating current.

Load Switching – Transferring the load from one source to another.

Low Voltage – A wiring system that provides power to some electronic devices operating on a voltage level much lower than the standard 110 volts such as doorbells and thermostats.

LB – Loadbreak

LVDA – Low Voltage Distribution Arrester

Neutral – The junction point of the legs in a Wye circuit.

Outlet – A point on the wiring system at which current is taken to supply utilization equipment.

Peak Demand – The maximum cumulative demand during a time period.

Power Outage – An interruption of power.

Resistor – Any device that limits the flow of current when voltage is applied.

Surge – Transient current or voltage associated with lightning or switching.

Switchgear – A general term that covers switching and interrupting devices and their combination with associated control, metering, protective and regulating devices.

Transfer Switch – An electronic device that will disconnect from one power source and connect to another power source under certain conditions.

Volt (V) – The unit of measure for voltage.

Voltage – The force which causes current to flow through an electrical conductor

Source:www.thelearningpit.com

Charity Electric, LLC. 136 Winwood Drive Center Barnstead, NH 03225 Phone:(603) 833 9204 . Email: Robert@charityelectrical.com