Electrical Distribution System

Single Phase Wiring

there is one neutral wire and one power wire with current flowing between them.

Neutral Wire

Its main function is to complete the circuit by carrying current back from the electrical device to the main electrical panel and then to the electrical supply transformer.

Three Phase Wiring

here are three power wires, each 120⁰ out of phase with each other. Delta and wye are the two types of circuits use to maintain equal load across a three phase system, each resulting in different wire configurations. There’s no neutral wire

Service Entrance Pole

A customer-owned pole which carries the service drop and the applicant's service entrance installations

Meter Banks

mostly used in apartments and rows of electrical supply

3100mm

Minimum Vertical Clearance Requirements Along sidewalks or above areas accessible to pedestrian only.

Minimum Vertical Clearance Requirements Over residential property, driveways and those commercial areas not subject to truck traffic.

3700mm

5500mm

Minimum Vertical Clearance Requirements Over public streets, alleys, roads, parking areas subject to truck traffic, on driveways other than residential property and other land traversed by vehicles such as cultivated, grazing. forest and orchard.

7400mm

Minimum Vertical Clearance Requirements Along and across national highways.

Short Circuits

Electricity wants to flow along the path of least resistance, which is usually the shortest path.

Normal short circuit

a powered or hot wire touches a neutral wire. Resistance immediately drops and the current begins to move in another path.

Ground fault short circuit

a powered or hot wire touches a grounded section of a box, device, appliance, outlet, bare ground wire, or anything else supplied by the electrical circuit.

Ground wiring

it is there to prevent this and to allow currents to escape through it, rather than through other parts of your home that can cause damage or harm to your home and family.

Switchgears

n an electric power system, a _____ is composed of electrical disconnect switches, fuses or circuit breakers used to control, protect and isolate electrical equipment. used to turn on/off power

Switchboards

Only used to transmit power to other sources, most often in commercial settings. Used to reroute power

NEMA box

These uses a standard rating system that frequently signifies a fixed enclosure's ability to withstand certain environmental conditions.

National Electrical Manufacturer Association

NEMA means

Panelboards

The goal of a ______ is to split energy into different circuits

Bus Bars

a conductor that serves as a common connection for two or more circuits.

Fuse

an electrical safety device that protects an electric circuit from excessive electric current.

Plug Type

a type of fuse where it is screwed directly into a standard fuse socket.

Cartridge Type

a type of fuse where contains a thin conductor designed to melt at a low temperature.

Blade Type

a type of fuse where contains two electrical connectors that plug into a circuit and a wire inside that will melt at a certain current.

Circuit Breaker

provides overcurrent protection and a manual means of controlling power distribution.

Incandescent Lamp

a source of electric light that works by incandescence, which is the emission of light caused by heating the filament.

Fluorescent Lamp

a type of gas-discharge lamp which uses electric current to excite the gas, which causes it to glow and hence the lamp generates light

Ballast

a device placed in series with a load to limit the amount of current in an electrical circuit

Starter

used to help fluorescent tubes and lamps ignite in the initial starting stage of their operation.

Compact Fluorescent Lamp

CFL means

CFL

a fluorescent lamp designed to replace an incandescent light bulb; some types fit into light fixtures designed for incandescent bulbs.

LED

a semiconductor device that emits light when current flows through it.

Light Emitting Diode

LED means

Ceiling Receptacles

A place to plug in cord connected appliances or equipment.

Convenience Outlet

A type of electrical outlet designed for easy access, allowing users to connect portable devices and appliances conveniently. usually 2-gang (Duplex); One-gang (Single) for independent loads.

GFCI Outlet

help prevent electrocution, electric shocks and burns. used in bathrooms

ground fault circuit interrupter

GFCI means

Toggle Switches

Controls the on/off status of the load (single, duplex or three-gang)

200mm

the switch has a MINIMUM of _____mm away from the door

dimmer switch

an electrical device that allows you to control the brightness of a light bulb.

Two-way Switch

Switch controls in One location

Three-way Switch

Switch controls in Two locations