Topic 1.4: Electrical Systems Design Principles

Residential

A building consisting of one or more dwelling units, usually for the use of the owner

Commercial

A building consisting of one or more commercial units for the use of the owner and/or others

Residential and/or Commercial Condominium

A condominium building consisting of a combination of residential and commercial units, wherein the units designed and constructed for independent use or ownership

Residential

Commercial

Residential and/or Commercial Condominium

Classification of Building

Electrical Code

Specifies the minimum provisions necessary for protecting people and property from the improper use of electricity and electrical equipment

National Electrical Code

Set of specifications and standards in the form of a model code that can be adopted into local law by the local governmental entity

Underwriters Laboratory, Inc. (UL)

Not-for-profit product safety testing and certification organization

It is the leading third-party certification organization in the United States and the largest in North America

National Electrical Manufacturing Association (NEMA)

Leading trade association in the United States representing the interests of electrical manufacturers

Philippine Electrical Code

Used nationally as the basis for safeguarding persons, buildings and its contents from hazards that may arise from the use of electricity

PEC I

Electrical Installation inside buildings

PEC II

Electrical Installation outside buildings.

PEC

Consists of rules which are intended to make use of electricity safe for person and property

Mandatory Rules

Characterized by the use of the word “SHALL’’

Advisory Rules

Characterized by the use of the word “SHOULD” or are stated as recommendations of that which is advised but not required

P.D. 1096

National Building Code

P.D. 1185

Fire Code of the Philippines

R.A. 7920

Act providing for a more responsive and comprehensive regulation for the practice, licensing and registration of electrical engineers and electricians

Public and private buildings

Electrical generating plants

Temporary and permanent substations

Industrial plants

Transformer stations

Railway switchyards

Yards, carnival, parking, etc.

Watercraft

Dockyards

Airfields

Quarries and mines

Mobile homes, travel trailers and recreational vehicles

Offshore facilities

Scope of PEC

Permit

required before undertaking any electrical installation

Inspection

Required after which certificate of final electrical inspection (CFEI) is issued by the authority

General Electrical Requirements

Specialized Electrical Requirements

Lighting Systems

Electrical Distribution Systems

Major Parts of the Electrical Plan Layout

Electrical Plan

It is a type of technical drawing that delivers visual representation and describes building’s circuits and electrical systems

Electrical drawing or Wiring Diagram

Other words for Electrical Plan

General Notes/Specification

Legend and Symbols

Location Plan

Riser Diagram

Title Block

Electrical Lighting and Power Layout

Schedule of Loads and Computations

7 Required Parts of a Standard Electrical Plan Layout

Riser Diagram

Consists of the schematic diagram of service entrance, feeders and branch circuits

General Electrical Requirements

Items such as the 230-volt general purpose receptacle outlets located throughout the building

• Laptops

• Desktop Computer Equipment

• Television

• Electric Fan

Specialized Electrical Requirements

Requires separated or dedicated electrical circuitry that serves only the specialized equipment

• Air-conditioner

• Computers and/or network servers

• Photocopiers

• Refrigerator

Electrical symbols

Allow for universal recognition of each part by the many persons who will be working on the project so that they can estimate costs appropriately and construct the project to the specifications

Floor Plan

Lighting Layout

Power Layout

General Notes (Specifications)

Legend (Symbols)

Schedule of Loads

Vicinity Map (Location Plan)

Riser Diagram

Panel board Details

Components of Electrical Plan Layout

• Highlights potential risks to make quick amendments before major damage occurs.

• Ensures safe, efficient, and smooth system operation.

• Saves time and prevents delays by helping professionals complete work on schedule.

• Lowers costs by detailing exact specifications (like wire lengths and cable types) to avoid unnecessary spending.

• Prevents injuries by identifying building areas that could harm technicians.

Benefits of Electrical Plan

• Vital for documenting, communicating, and troubleshooting power systems on-site

• Keeps buildings compliant with all code regulations through accurate and updated drawings.

• Encompasses all aspects, focusing on areas like lighting, electronics, and appliances.

• Integrates building structures (such as railings and stairs) to ensure proper modifications.

• Provides an in-depth, thorough planning tool for electrical and wiring systems.

• Distributes power effectively to various appliances and equipment.

Purposes of Electrical Plan

Design Process

Understanding the Project Scope

Defining the Major Parts of the Electrical Plan Layout

Electrical Plan Design