Learning Outcome 2
Interpret technical drawings and plans
PERFORMANCE STANDARDS
Necessary tools, materials and equipment are identified according to the plan.
Components, assemblies or object are recognized as per job requirement.
Dimensions and specification are identified according to job requirements.
Materials/ Resources
1. Bulb receptacles – 4 pcs.
2. Toggle switch - 2 pcs.
3. Electrical lay-out
4. Ruler
What Do You Already Know?
Let us determine how much you already know about interpreting technical drawings and plans. Take this test.
Directions: Below is a drawing of an electrical plan. Enumerate the number of outlets, bulbs, one-gang switch, two-gang switch and three-gang switch.
What Do You Need To Know?
Read the Information Sheet 1.1 very well then find out how much you can remember and how much you learned by doing Self-check 1.1.
ELECTRICAL WIRING DIAGRAM
The flow of current in a conductor or wire can be represented by diagram. There are two types of diagram: pictorial diagram and schematic diagram.
A. Pictorial diagram is a sketch of electrical circuit that shows the external appearance of each component. It is much like a photograph of the circuit and uses simple images of parts.
B. Schematic diagram is a sketch showing the components of the circuit using standard electrical symbols. It shows the actual number of components and how the wiring is routed but not the actual location.
C. Types of Circuit
1. Series Circuit is a circuit in which lamps are arranged in a chain, so that the current has only one path to take. The current is the same through each load. Example of this is the Christmas lights. It consists of a number of bulbs that are connected side by side to meet the voltage requirement which is 220 volts for alternating current.
2. Parallel Circuit is a circuit in which lamps are connected across the wires. The voltage across each load on parallel circuit is the same. The advantage of using parallel circuit is that even if one of the lamps fails, still the remaining lamps will function.
ELECTRICAL PLAN
Electrical plan is a graphical presentation of electrical wiring connections to install in a particular house or building. It indicates the position of electrical fixtures such as convenience outlets, switches, lightings, door bells, and others to be installed.
Sample electrical plan of Single family dwelling
How Do You Apply What You Have Learned?
Show that you learned something by doing this activity.
Activity Sheet 2.1 Directions: Draw the schematic diagram of the following using circuit builder app:
1. Two bulbs connected in series controlled by a single pole switch using direct current.
2. Four bulbs connected in parallel controlled by a single pole switch using alternating current.
How Much Have You Learned?
Self-Check 2.1 Directions: Based on the electrical plan below count the number of electrical fixtures and then write it in table provided after the drawing.
