Planning for Electrical Design 1

EE 513 Electrical System Design

Engr. Jay S. Villan, MEPNotre Dame of Dadiangas University

Objectives:1. Define electrical design2. Identify the vital requirements of an

electrical design3. Examine the three basic steps in the design

of an electrical system4. Analyze the importance of the approach in

electrical design.5. Point out the importance of standards in

infusing safety in the electrical design.

Planning for Electrical Design1. Four Vital Requirements of an electrical design2. Three basic steps in the design of an electrical system3. Approach in the design task4. Safety provisions

1. NEC2. IEC3. OSHA

5. Spare Capacity6. System Analysis7. Type of Building8. Standard equipment9. System Power Supply

What is electrical design?The design of an electrical system for any

building or outdoor area is a matter of an arrangement of conductors and equipment to safely and effectively transfer electric energy from a source of power to lamps, motors, and other functional devices which operate on electricity.

Four Vital Requirements of an electrical design1. Ensure conformity to applicable codes and

standards.2. Study and establish the electrical needs of

the building.3. Determine the characteristics of the energy

supply to the overall system.4. Scale details of the overall electrical system

to meet the limitations of budgeted funds.

Three basic steps in the design of an electrical system1. Select basic wiring concepts and

configurations which will supply electric power of the required characteristics at each point of utilization.

Three basic steps in the design of an electrical system3. Account for the installation of the overall

electric system, as determined in the first two steps, within the physical dimensions and structural make-up of the building, showing as clearly as possible, the locations and details of equipment mountings, raceway runs, connections to main power supply lines, and other elements that require special attention.

Three basic steps in the design of an electrical system2. Implement the electrical circuiting concepts

with actual conductors, apparatus, and hardware, selecting types, sizes, models, characteristics, appearance, ratings, and other specifics of the required equipment.

Approach in the design task1. Should be familiar with all the background

factors of the design.2. In depth engineering ability.3. Understand the relationship between the

pure technology and such considerations such as

1. safe application 2. capacity for load growth 3. flexibility in the use of the system 4. and effective layout

Approach in the design task4. Must be correlated with modern standards

New techniques Promising trends Combination of old and new wiring

techniques Devise original circuits and layouts for new or

special applications

Safety Provisions1. PEC (Philippine Electrical Code) and NEC

(National Electrical Code)1. Enclosing2. Supporting3. Insulating4. Isolating5. Protecting electrical equipment

Safety is not automatically made a characteristic of a system by simply observing

codes. Safety must be designed into the system.

Safety ProvisionsPEC (Philippine Electrical Code) and NEC (National Electrical Code)

Used in court litigationInsurance companies as a basis for insuring

buildings

Safety ProvisionsPEC (Philippine Electrical Code) and NEC (National Electrical Code)

Must be thoroughly understood by electric designers.

Familiarity with all its sections and should know the accepted interpretations which have been given to many of its ruling

Electric designers must keep abreast of the official interpretations, and interim amendments

Must be in hand and should be studied often.

Safety ProvisionsOSHA (Occupational Safety and Health Administration)..\references\OSHA-at-a-glance.pdf..\references\OSHA electrical safety for masonry works.ppt

Safety ProvisionsIEC (International Electrotechnical Commission)

The International Electrotechnical Commission is the leading global organization that publishes consensus-based International Standards and manages conformity assessment systems for electric and electronic products, systems and services, collectively known as electrotechnology.

IEC publications serve as a basis for national standardization and as references when drafting international tenders and contracts.

http://www.iec.ch/about/activities/?ref=menu