om of Saudi Arabia
y of Education
iversity
College of Engineering
Architecture Engineering Dep
Electrical Systems Design for Buildings
Fall 2025
Lecture 3
Installation Basics
General Specifications
1
Any person carrying out electrical work must be competent, trained and skilled.
Trainees or unskilled operatives must be appropriately supervised. They must
deal correctly with equipments:
- Deenergize electric equipment before inspecting or repairing
- Using cords, cables, and electric tools that are in good repair
- Use appropriate protective equipment
very item of equipment shall comply with the necessary standards and provide an
cceptable degree of safety.
stallation includes any and all electrically operated circuits, apparatus, a
mponents.
stallation includes many electrical tasks:
new electrical installations and their connection to supply
existing installations and their maintenance and modification
temporary wiring arrangements
testing and fault finding on circuits or equipment
switching operations
Inspections and monitoring.
Who are the participants on electrical installation project :
)Owner (Person or Company
e owner specifies the specifications and uses of the project
مكتب اﻻستشارات الهندسية -لعمل التصميمات الهندسية و مواصفات ( Electrical Consultant Engineer
)التنق
وفى أغلب المشاريع يكوف اﻻستشارى هو المشرف على تنفيذ المشروع
)المقاول-شركة المقاوﻻت المنقذة ( Contractor
ىقوم بتنفيذ اﻷعمال الواردة فى مخططات المشروع التى أعدها اﻻستشاري بالمواصفات المحددة
المشرف علي تنفيذ اﻻعمال الكهربية Electrical Supervisory Engineer
ponsibilities of contractor:
mpletely consider the electric safety rules during installation
equipment must be standard according to the specified regulations
ake the necessary tests using calibrated devices
ovide all necessary equipment according to the specifications
move any temporary installation at the end of the project
ake all necessary Shop Drawings explaining all information about the installed electr
pment and accessories such as:
ble tray, pipes and number of cable in each pipe or tray
ckets specifications, sizes of switches, rate of circuit breakers and short circuit currents
re alarms circuits
cation of all panels and the cable paths
epare the final drawing for all works (As-Built
Built ) to explain everything about the review a
tenance of the electrical installations in the project
What are the responsibilities of electrical supervisory engineer?
Cooperation between various specialization during Designing
electrical installation project
• To specify the necessary area for main electrical room and
specify the proposed cable tray and pipes paths
Components of an electrical installation project:
Electrical Consultant Engineer
Electrical Contractor
Electrical Consultant Engineer
Design
Any person who makes a decision on the selection and
connections of an electrical accessory is a designer.
The Designer should certificates that the design work matches
the wiring regulations.
- Installation
The installer has the responsibility to ensure that equipment is
installed correctly and in accordance with the specifications
provided by the designer and according to the wiring regulations.
- Inspection and Test
The test procedures must be carried out both during the work and
upon the completion.
At the end of the project, the inspector should certificates that the
inspection and test gave been carried out in accordance with the
wiring regulations.
Types of Drawings in any Project
Number of Drawings
Lighting Layouts for each floor
Power Layout for each floor
Low Current layouts including
§ Telephone Layout § Internet Layout § TV Layout § Fire Alarm
yout § Fire Fighting Layout §
Surge Arrestor and Grounding Layout
he main steps in the electrical power distribution installation
roject
ep 1: estimation of total electrical loads (considering additional systems
uch as TV, Net, Firing, Calling,…) to specify the size of the transformers,
ables and necessary additional areas to install the equipment.
ep 2: draw a single line diagram for load feeding, cable trays, electrical
cilities and specification of the main electrical room.
ep 3: select of all protective devices.
ep 4: Design of the cross section areas of all conductors and the distributio
anels.
ep 5: prepare the final drawing, coding and analysis.
INSTALLATIONS: a Shop Drawing
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