Building Electrical Works

Multi-outlet assembly

"A type of surface flush raceway designed to receive conductors and receptacles assembled in the field or in the factory."

Disconnecting Means

A device by which the conductors of a circuit can be disconnected from their source of supply.

circuit breaker

A device designed to open and close a circuit by nonautomatic means and to open the circuit automatically on a predetermined overcurrent without damage to itself when properly applied within its rating.

Continuous Load

A load where the maximum current is expected to continue for 3 hours or more.

Voltage, Nominal

A nominal value assigned to a circuit or system for the purpose of conveniently designating its voltage class (e.g., 120/240 volts, 480Y/277 volts, 600 volts).

Dwelling Unit

A single unit, providing complete and independent living facilities for one or more persons, including permanent provisions for living, sleeping, cooking, and sanitation.

device

A unit of an electrical system, other than a conductor, that carries or controls electric energy as its principal function.

Outline Lighting

An arrangement of incandescent lamps, electric discharge lighting, or other electrically powered light sources to outline.

Ground-Fault Current Path

An electrically conductive path from the point of a ground fault on a wiring system through normally non-current-carrying conductors, equipment, or the earth to the electrical supply source.

energized

Electrically connected to, or is, a source of voltage.

4 types of electrical injuries

Electrocution, electrical shock, burns, falls

Voltage to Ground

For grounded circuits, the voltage between the given conductor and that point or conductor of the circuit that is grounded; for ungrounded circuits, the greatest voltage between the given conductor and any other conductor of the circuit.

equipment

General term of materials at Electrical installation

Electrical Hazards to watch out for

Inadequate wiring Cord with frayed insulation Loosed electrical connection Overhead powerlines

Types of burns (LHAAFFO)

Low voltage burns- 500v High voltage burns- v severe Arc burns - high to low resistance Flash burns - passes thru skin Flame burns - by flash & arc burns Oral burns - by biting ​

Effects of electrical current on the body

More then 3 ma, painful shock More then 9 ma, muscle contraction More than 30 ma, Lung paralysis

Resistance of Materials

Most metals- >0-50 Dry wood - 100,000 Wet wood - 1,000 Rubber- 1,000,000 giga

Duty, Intermittent

Operation for alternate intervals of (1) load and no load; or (2) load and rest; or (3) load, no load, and rest.

Duty, Continuous

Operation for alternate intervals of 1 load for an indefinely long time

Overload

Operation of equipment in excess of normal, full-load rating, or of a conductor in excess of rated ampacity that, when it persists for a sufficient length of time, would cause damage or dangerous overheating. A fault, such as a short circuit or ground fault, is not an overload.

Ways to control electrical Hazards

Prevent overloaded wiring by using right size wire Prevent shocking current from the system by grounding Use overcurrent device Use GFCI Prevent exposure to live wires by isolating them

fault

Such as short circuit or ground fault, is not an overload

Branch Circuit

The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s).

service

The conductors and equipment for delivering electric energy from the serving utility to the wiring system of the premises served.

Philippine Electrical Code (PEC)

The electrical safety Code that establishes basic materials quality and electrical work standards for the safe use of electricity for light, heat, power, communications, signaling, and other purposes.

Interrupting Rating

The highest current at rated voltage that a device is identified to interrupt under standard test conditions.

Ampacity

The maximum current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.

Service drop

The overhead conductors between the utility electric supply system and the service point.

Short circuit current rating

The prospective symmetrical fault current at a nominal voltage to which an apparatus or system is able to be connected without sustaining damage exceeding defined acceptance criteria.

demand factors

The ratio of the maximum demand of a system, or part of a system, to the total connected load of a system or the part of the system under consideration.

Service Lateral

The underground conductors between the utility electric supply system and the service point

Touch voltage

The voltage between energized object and the feet of a person in contact with the object

complete

To flow, current must have a _______ path

3 standards found in the Philippine Electrical Code

Wiring design Rules Installation Rules Manufacturing Rules