Electrical installation and maintenance

1. How do you interpret this picture?

2. Our lesson for today….
Interpret Electrical Plan/Drawing

3. Interpret Electrical Plan/Drawing
Objectives
At the end of this lesson, you will be able to:
1. Define electrical plan.
2. Identify the different parts and details of an
electrical plan.

4. Interpret Electrical Plan/Drawing
Before we begin
Recall from the previous lesson…
Three categories of workplace hazards
• Electrical symbols
• Electrical signs
• Electrical data

5. Interpret Electrical Plan/Drawing
Electrical Plan
A technical
representation of
electrical system
proposed to be
installed in
building or house,
which includes
material, devices
and equipment.

6. Parts of an Electrical Plan
1. Floor Plan
A diagram, usually to
scale, showing the
relationships
between rooms,
spaces and other
physical features at
one level of a
structure.

7. Parts of an Electrical Plan
2. Legend
Shows the meaning
of each symbol
used in the
electrical plan. The
following are
sample symbol
commonly used in
the plan.

8. Parts of an Electrical Plan
3. Load Schedule
Shows the number
of branch circuit,
lighting outlet,
convenience outlet,
total wattage rating,
total load current,
size of wire, and
computation of load
per branch circuit.

9. Parts of an Electrical Plan
4. Riser Diagram
An schematic
presentation of the
entire electrical circuit
from the service
entrance up to the
smallest circuit branch.

10. Parts of an Electrical Plan
5. Title Block
Indicates the following:
• Name of project
• Location of project
• Name of owner
• Name & signature of
electrical engineer
• Name & signature of
architect
• Sheet content and
number

11. Parts of an Electrical Plan
6. Specification
Specification includes the
following:
1. Classification of service
2. Type of wiring method
to be used
3. Number of branch
circuit and their
corresponding sizes
4. Supplies materials to
be used by the
contractor

12. Parts of an Electrical Plan
7. Location map
Shows the following details:
• Bordering areas
showing the well know
streets.
• Location of the utility
company pole which
supplies electric
energy.

13. Interpret Electrical Plan/Drawing
Activity
Class role-playing, form a group of 5, each group
compose of 6 members. Each member of the
group play as one Personal Protective Equipment
and state their function.

14. Interpret Electrical Plan/Drawing
What you have learnt today
Parts of an electrical plan and details.
• Floor Plan
• Legend
• Load Schedule
• Riser Diagram
• Title Block
• Specification
• Location Map