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Home / Download Center / Electrical Engineering Books and Technical Guides / Electrical engineering guides / Lighting And Electrical Systems Design Guide (Elementary School Building Example)

Distribution of electrical energy

The lighting and electrical design of elementary school is divided into following parts: electrical design, lighting design, fire alarm design, and telecom design. The school’s electrical system will consist of three-phase 480/277V power and three-phase 208/120V power. The incoming utility feed is assumed to be three-phase 4,160 Volt.

Lighting and electrical systems design guide - An example of elementary school building
Lighting and electrical systems design guide – An example of elementary school building

This incoming feed enters the building from the Park Avenue street side of the building running parallel with the natural gas, water, and telecommunications utilities.

The service terminates in the building’s main electrical room which is centrally located in the basement level. At the unit substation which consists of a main service breaker-disconnect, a 750 kVA delta-wye transformer, secondary breaker, and secondary switchgear distribution section, the main service is stepped down from a three-phase 4,160V delta to a 480/277V wye configuration.

From here the system splits into the building’s three main power branches – life safety, emergency, and normal. The life safety branch will carry all loads deemed necessary for the protection of human life. The emergency branch will carry all loads that are necessary for safe and reliable operation of the school as an emergency natural disaster shelter.

Supplying standby power for the life safety and emergency branches will come from four Capstone 65kW natural gas microturbines, which will be discussed later in this document (Please see the attached electrical riser diagram for a more detailed organization of the electrical system).

Riser diagrams
Riser diagrams

The preliminary sizing for all equipment was based on a tabulation that can be found on page 25 of the supporting documents and also details of this equipment can be seen on pages 29-30.


Equipment Layout

As mentioned before, the unit substation will be located in the building’s main electrical room in the basement level.

Also, this room will house the main distribution panels for each of the three power branches – life safety, emergency, and normal. The automatic transfer switches for the life safety and emergency branches will be located here as well.
Main Electrical Room Layout
Main Electrical Room Layout

Finally, each branch will be provided with a 480/277V lighting panel, transformer, and 208/120V double-tub receptacle panel in the main electrical room.

Title:Lighting And Electrical Systems Guide – ASCE Charles Pankow Foundation Architectural Engineering Student Competition
Format:PDF
Size:8.7 MB
Pages:45
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Lighting And Electrical Systems Design Guide - An Example of Elementary School Building
Lighting And Electrical Systems Design Guide – An Example of Elementary School Building

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27 Comments


  1. Victor Plunkana Phiri
    Jan 28, 2021

    Please call


  2. Ijimakinwa Stephen
    Sep 24, 2020

    Maybe we can work together.
    I want to learn more about electrical


    • A Hareendralal
      Nov 26, 2020

      What is the maximum capacity of motors that can be operated at various voltage levels: eg. Single phase (230V), Three phase (440V), 3.3 kV, 6.6 kV, 11kV.


  3. Zeeshan Bacha
    Jan 29, 2020

    Hi, I need Cable size and ckt breaker rating in pdf file plz
    [email protected]
    It’s my mail

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