Installing Domestic Refrigeration and Air-Conditioning (DomRAC) Unit

Performance Criteria Checklist
Task Sheet #1.2

Title: Lay Out Cavity Dimension of an Air
conditioning Unit

CRITERIA YES NO

Did I..

1. 1. Prepare dimension of cavity through checking of work
2. instructions?

2. Cut, design ,Bore with cavity dimensions?

,3. Finish, level, plumb Cavity sides properly?

4. select and use Appropriate PPE in line with job

Requirement?

5. Clean and keepWorksite in safe state in line with work

Instructions?

Assessment Result:

Competent Not Yet Competent

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ASSIGNMENT SHEET #1.2

LO 1: CONDUCT SURVEY
Objective: In air conditioning shop scenario, the trainee will be able to make a
layout on your own. The purpose is to enhance your skill in making layout

Instructions:
1. Ask your trainer where you would do the layout.
2. Based from the working drawing, make the necessary layout.
3. After doing the layout, let your trainer check your work.

Working Drawing:

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Information Sheet # 1.1-4

LO 1: CONDUCT SURVEY

Learning Objectives: In air conditioning shop scenario, the trainee
must be able to prepare cavity for air-con unit to be installed, demonstrate
theability touse hand tools and power tools and demonstrate the safety
practices in preparingcavity works.

Performing Cavity Works in Concrete Surface

Concreteis a composite construction material, composed of cement(commonly
Portland cement) and other cementitious materials such as fly ash and slag
cement, aggregate (generally a coarse aggregate made of gravels or crushed
rocks such as limestone, or granite, plus a fine aggregate such as sand), water,
and chemical admixtures.

Concrete is widely used in domestic, commercial, recreational, rural and
educational construction.

Communities around the world rely on concrete as a safe, strong and
simplebuilding material. It is used in all types of construction; from domestic
work tomulti-storey office blocks and shopping complexes.

Despite the common usage of concrete, few people are aware of the
considerations involved in designing strong, durable, high quality concrete.

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Self-Check #1.1-4

LO 1: CONDUCT SURVEY

Check you mastery of ______________ by completing the questions/tasks below.
I. List down the tools that fall under of each of the following:

D. Holding Tools: F. Personal Protective Equipment:

1. ______________ 1. ________________
2. ______________ 2. ________________
3. ______________ 3. ________________
4. ______________ 4. ________________
5. ______________ 5. ________________

E. Equipments:

1. ______________
2. ______________
3. ______________
4. ______________
5. ______________

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ANSWER KEY #1.1-4
Self-Check of #1.1-4

LO 1: CONDUCT SURVEY

A.Holding Tools: C. Personal Protective
Equipment:
1. Extension cord
2. Chisel 1. Helmet
3. Ball Peen Hammer 2. Goggles
4. Paint brush 3. Gloves
4. Mask
B.Equipments: 5. Working clothes
6. Safety shoes
1. Portable disc grinder

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Title: TASK SHEET 1.3
Performing cavity works in concrete surface

Performance Objective: In air conditioning shop scenario, the trainee
must be able to prepare cavity for air-con
unit to be installed, Demonstrate the ability to
use hand tools and power tools and
demonstrate the safety practices in preparing
cavity works.

Supplies/Materials: Pencil or pen and marker, concrete grinding
disc, paint

Equipment : Window-type air-conditioning unit

Tools:Extension cord, cold chisel, ball peen
hammer, paint brush

Personal Protective Equipment: Gloves, mask, goggle, safety
shoes

Steps/Procedure:

Based on the layout that you have done earlier, we can now start making
the cavity for our air-condition unit. But before you start, make sure that
you are wearing appropriate Personal Protective Equipment (PPE).

1. Using your disc grinder,
cut the marked lines
from the wall. Make
sure that the disc
installed in the disc
grinder is intended for
concrete cutting.

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2. Chip out the cut lines to
remove unwanted concrete

3. Repeat step 1 and 2
until cavity is completed.

4. Smoothen rough
surface by applying
plaster to finish it. Make
sure that you maintain
the tolerable gap
between the edge of
the cavity and the
housing of the unit (all
sides except the bottom
part should not be more
than 3 mm).

5. Some finishing requires
painting. If this happens,
let the concrete dry totally
before applying paint on it.

Assessment Method:

Demonstration, Evaluate Using Performance criteria checklist

Performance Criteria Checklist

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Task Sheet #1.1-4

CRITERIA YES NO

Did I..

3. 1. Repair dimension of cavity checking work
4. Instructions?

2. Boring, cutting is designed wit cavity dimensions?

3. Finish Cavity sides level, plumb,
Ensuring that all sides are airtight?

4. Select and use appropriate PPE?
requirement.

5. Clean worksite and keep in safe state ?

Assessment Result: Not Yet Competent
Competent

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ASSIGNMENT SHEET #1.3

LO1: PERFORM CAVITY WORK.

Objective:In air conditioning shop scenario, the trainee will be able to
demonstrate the use of hand tools and power tools and the safety practices in
preparing the cavity works. The purpose is to enhance your skill in performing
the cavity works in concrete surface.

Instructions:

1. Ask your trainer where you would do perform.
2. Based from the working drawing, make sure that you are wearing

appropriate PPE.
3. After doing this task, let your trainer check your work.

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Information Sheet # 1.1-5

LO1. PERFORM CAVITY WORK.

Learning Objectives: In air conditioning shop scenario, the trainee
must be able to prepare cavity for air-con unit to be installed, demonstrate
theability touse hand tools and power tools and demonstrate the safety
practices in preparingcavity works.

Performing Cavity Works in Wooden Surface:

The key to a successful refinishing job is the preparation of the surface.
The wood surface must besmooth and clean; since any scratches will be more

noticeable after the finish is applied than theyare in the bare wood. Never use
sandpaper on an antique. The surface preparation procedure youfollow
depends on the characteristics of the wood piece and the stripping.

After the wood surface has been prepared to your satisfaction, carefully
brush the surface with a stiffbristle or fiber brush to remove all traces of
sanding residue and steel filings. This is speciallyimportant for oak as
chemicals in oak will react with metal filings causing a stain on the wood.

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Self-Check #1.5

LO1. PERFORM CAVITY WORK.

Check you mastery of ______________ by completing the questions/tasks below.

I. List down the tools that fall under of each of the following:

A. Holding Tools: C. Personal Protective Equipment:

1. ______________ 1. ________________
2. ______________ 2. ________________
3. ______________ 3. ________________
4. ______________ 4. ________________
5. ______________ 5. ________________

B. Equipments:

1. ______________
2. ______________
3. ______________
4. ______________
5. ______________

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ANSWER KEY #1.5
Self-Check of #1.5

LO1. PERFORM CAVITY WORK.

A.Holding Tools: C. Personal Protective
Equipment:
1. Extension cord
2. Chisel 1. Helmet
3. Ball Peen Hammer 2. Goggles
4. Paint brush 3. Gloves
4. Mask
B.Equipments: 5. Working clothes
6. Safety shoes
1. Portable disc grinder

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Title: TASK SHEET 1.5
Performing cavity works in wooden surface

Performance Objective: In air conditioning shop scenario, the trainee
must be able to prepare cavity for air-con
unit to be installed, Demonstrate the ability to
use hand tools and power tools and
demonstrate the safety practices in preparing
cavity works.

Supplies/Materials: Concrete grinding disc

Equipment : Portable grinder , portable hand drill,

portable jig saw

Tools:Extension cord, cold chisel, hack saw, ball
peen hammer, cross cut saw, wood chisel

Personal Protective Equipment: Gloves, mask, goggle, safety
Shoes, ear plug

Steps/Procedure:

Based on the layout that you have done earlier, we can now start making
the cavity for our air-condition unit. But before you start, make sure that
you are wearing appropriate Personal Protective Equipment (PPE).

1. Using your portable hand
drill, bore series of holes
which will allow the blade of
your wooden saw to fit freely.

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2. Insert the blade of the jig
saw on the hole that you drilled.

3. Using your portable jig saw,
cut along the line. Make
sure you maintain the
required gap between edge
of the cavity and the
housing (all sides except
that the bottom part should
not be more than 3 mm).

4. To hide the rough edges on
the wall, install wooden
frame (only if needed)

Assessment Method:

Demonstration, Evaluate Using Performance criteria checklist

ASSIGNMENT SHEET #1.5

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LO1: PERFORM CAVITY WORK.

Objective: In air conditioning shop scenario, the trainee will be able to
demonstrate the use of hand tools and power tools and the safety practices in
preparing the cavity works. The purpose is to enhance your skill in performing
the cavity works in wooden surface.

Instructions:

1. Ask your trainer where you would do perform.
2. Based from the working drawing, make sure that you are wearing

appropriate PPE.
3. After doing this task, let your trainer check your work.

Information Sheet # 1.1-6

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LO1. PERFORM CAVITY WORK.

Learning Objectives: In air conditioning shop scenario, the trainee
must be able to prepare cavity for air-con unit to be installed, demonstrate
theability touse hand tools and power tools and demonstrate the safety
practices in preparingcavity works.

Performing Cavity Works in Window Sills:

House windows have two frames. A rough frame outlines the basic
opening, with studs and cross members called headers or sills, to form the
wall. A finished frame holds the window panes and is covered with trim,
including a bottom element called a sill. Both frames are basically rectangles,
usually of wood, and both are essential to a good window. Rough framing is
usually done during original construction or remodeling, including
replacement of a window. Finish framing and trimming is done after the wall is
completed and covered with drywall

Self-Check #1.6

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LO1. PERFORM CAVITY WORK.

Check you mastery of ______________ by completing the questions/tasks below.

I. List down the tools that fall under of each of the following:

A. Holding Tools: B. Personal Protective Equipment:

1. ______________ 1. ________________
2. ______________ 2. ________________
3. ______________ 3. ________________
4. ______________ 4. ________________
5. ______________ 5. ________________

ANSWER KEY #1.6

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Self-Check of #1.6

LO1. PERFORM CAVITY WORK.

A.Holding Tools: B. Personal Protective
Equipment:
1. Hack saw
2. Screw driver 1. Helmet
3. Ball Peen Hammer 2. Goggles
4. Paint brush 3. Gloves
4. Mask
5. Working clothes
6. Safety shoes

TASK SHEET 1.6 Date: Developed Date: Revised Page #

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Title: Performing cavity works in window sills

Performance Objective: In air conditioning shop scenario, the trainee
must be able to prepare cavity for air-con
unit to be installed, Demonstrate the ability to
use hand tools and power tools and
demonstrate the safety practices in preparing
cavity works.

Supplies/Materials: Concrete grinding disc

Equipment :

Tools: Hack saw, screw driver

Personal Protective Equipment: Gloves, mask, goggle, safety
Shoes, ear plug

Steps/Procedure:

Based on the layout that you have done earlier, we can now start making
the cavity for our air-condition unit. But before you start, make sure that
you are wearing appropriate Personal Protective Equipment (PPE).

1. Remove all obstructions where
the unit will be installed, this
may include:

a. Removing of window
glass or pane

b. Cut steel braces

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2. Install fabricated gap filler if
necessary. This is to ensure
that the gap between the edge
of the cavity and housing is
within tolerable limit (all sides
except the bottom part should
not be more than 3 mm). The
fabricated gap filler may be
made of wood, board, rubber,
plastic, glass or the same
material that have been removed.

Assessment Method:

Demonstration, Evaluate Using Performance criteria checklist

ASSIGNMENT SHEET #1.6

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LO1: PERFORM CAVITY WORK.

Objective:In air conditioning shop scenario, the trainee will be able to
demonstrate the use of hand tools and power tools and the safety practices in
preparing the cavity works. The purpose is to enhance your skill in performing
the cavity works in window sills.

Instructions:

1. Ask your trainer where you would do perform.
2. Based from the working drawing, make sure that you are wearing

appropriate PPE.
3. After doing this task, let your trainer check your work.

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Task Sheet #1.6

Title: Performing cavity works in window sills

CRITERIA YES NO

Did I..

5. 1. Prepare dimension of cavity ?

2. Bore, cut designed cavity dimensions?
3.Finish ,level, plumb cavity sides ?

4. Select appropriate PPE and use in line with job
Requirement?
5. Clean and kept worksite in safe state ?

Assessment Result: Not Yet Competent
Competent

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Information Sheet # 1.2-1

LO2. INSTALL DomRAC ELECTRICAL CIRCUITS

Learning Objectives: In a refrigeration and air conditioning shop scenario,
the trainee will be able to prepare the electrical materials, tools and equipment
according to the job requirements, install the electrical components, circuit
according to the standard procedures and the latest provision of PEC.

Introduction

Before a utility will connect an installation to its supply network, strict
pre-commissioning electrical tests and visual inspections by the authority, or by
its appointed agent, must be satisfied.

These tests are made according to local (governmental and/or
institutional) regulations, which may differ slightly from one country to another.
The principles of all such regulations however, are common, and are based on
the observance of rigorous safety rules in the design and realization of the
installation.

PEC and related standards included in this guide are based on an
international consensus for such tests, intended to cover all the safety
measures and approved installation practices normally required for residential,
commercial and (the majority of) industrial buildings. Many industries however
have additional regulations related to a particular product (petroleum, coal,
natural gas, etc.). Such additional requirements are beyond the scope of this
guide.

These tests and checks are basic (but not exhaustive) to the majority of
installations, while numerous other tests and rules are included in the
regulations to cover particular cases, for example: TN-, TT- or IT-earthed
installations, installations based on class 2 insulation, SELV circuits, and
special locations, etc.

The aim of this guide is to draw attention to the particular features of different

types of installation, and to indicate the essential rules to be observed in order

to achieve a satisfactory level of quality, which will ensure safe and trouble-free

performance. The methods recommended in this guide, modified if necessary to

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comply with any possible variation imposed by a utility, and are intended to
satisfy all pre-commissioning test and inspection requirements

Install Electrical Circuit:

Mounting of components and fixtures using wood screws and wall plugs.

1. This is a component housing
which is to be mounted with four
screws onto a wall at the right
hand side of a door opening.

2. In this case the housing has to be
mounted at a place where its
vertical center line is 80cm away
from the door opening and where
its horizontal center line is 120 cm
away from the floor.

3. Mark out the position of the four
mounting holes. For this
operation use a flexible rule, a
spirit level and a pencil.

4. With a rule, measure the
diameter “D” of the mounting
holes. Let us assume that “D” in
this case is 5.5.

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5. Select four wood screws which
are Suitable in size and shape
for the mounting of the
components. The shaft diameter
"D” of the screws should be

slightly smaller than the
diameter "D" of the mounting
hole. In this case screws with a
shaft diameter of 5 mm should
be used.

6. As the mounting holes of this
housing have no recess, use
round head screws. For
differently shaped mounting
holes you have to select screws
with the appropriate shape and
size of head.

7.The length "1" of the screws
depends on the size and weight
of the component, the thickness
of its mounting base and the
type and thickness of the
surface onto which it is
mounted. In this case a screw
which is 25 m long is suitable.

8. If you mount components and Date: Developed Date: Revised Page #
fixtures with round head screws,
it Is. good practice to use a fiat
washer between the screw head
and the mounting hole. The flat
washer has the same inside
diameter as the mounting hole.

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In this case a flat washer with an
inside diameter of 5.5 mm. should be used.
9. It the housing is to be mounted
onto a wooden surface, use a
GARNISH AWL' to make a small
hole fl the centre of each marked,
out circle.

1O.The hole produced by the garnish
awl has to be smaller than the
screw. If you look at this drawing
you will see a shaded area in the
middle of a wood screw. This
shows the approximate size of
the hole compared to the size of
the screw.

11. If you would cut through the
mounting surface, the bore you
make with a garnish awl would
look like this.

12. SAFETY NOTE

When using a garnish awl,
take care that you do not injure
yourself with its pointed tip. When
the garnish awl is not in use
protect its tip with a cork.

13. If YOU are using large wood Date: Developed Date: Revised Page #
screws use a GIMLET Instead of
a garnish awl. Gimlets are wood
drills which are operated by
hand. They are available in
sizes ranging from 2 to 10.

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14. Now select .a screw driver with a
blade to fit the slots of the wood
screws and mount the
component on the surface. Screw
in the screws at right angles to
the working surface.

15. Tighten the screw in the
sequence shown.

16. If the housing to be mounted onto
masonry surface, wall plug have
to be inserted into the wall at the
four places where the wood
screws have to screwed in.

17. Select the wall plugs according to
the size of the wood screws for
wood screws 8 x 25 mm use wall
plugs 8 x 25 mm.

18. Mark the center of each hole with
a centre punch and a 500 gram
hammer.

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19. Select the appropriate size of
masonry drill which, in this case,
must have a diameter of 8 mm.
Using either a masonry hand drill
or a portable electric drill, drill the
four holes to the depth required
for the wall plugs.

20. The depth of the holes should
be 2 or 3 m more than the length
of the wall plugs.

21. When you have drilled and
cleaned the holes. Insert the
wall plugs with your fingers.
Sometimes you may have to tap
them in using a light hammer.

22. To mount the housing, proceed
as explained in paragraphs 13
and 14. You may find that with
certain wall plug. It may be
necessary to tap the wood
screws lightly with a hammer
before screwing them in with a
screwdriver.

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Self-Check #1.2-1

LO 2. INSTALL ELECTRICAL CIRCUIT.

Multiple Choice: Choose the correct letter that best describe the statement.

Write your answers in capital letter on your answer sheet.

1. Part of the component housing which is mounted with four screw into the
wall:
A. Junction box
B. Utility box
C. Receptacle
D. Plastic

2. Part of the component use for fastening the junction box into the wood.
A. Screw
B. Nail
C. Masking tape
D. Electrical tape

3. Is a kind of screw use for mounting the holes of the housing?
A. Wood screw
B. Round head screw
C. Flat screw
D. Metal screw

4. Is a kind of tool operated by hand and use for drill the wood?
A. Drill beat
B. Nail
C. Gimlet
D. Screw

5. Is a kind of tool use for marking the wall?
A. Pencil
B. Chalk
C. Center punch
D. Knife

ANSWER KEY #1.2-1
Self-Check of #1.2-1

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LO1. INSTALL ELECTRICAL CIRCUIT.

1. A / B
2. A
3. B
4. C
5. C

ASSIGNMENT SHEET #1.2

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LO2: INSTALL ELECTRICAL CIRCUIT.

Objective:In air conditioning shop scenario, the trainee will be able to mount
the components and fixtures using wood screws and wall plugs, demonstrate
the use of power tools and the safety practices in mounting the components and
fixtures. The purpose is to enhance your skill in mounting the components and
fixtures.

Instructions:

1. Having read and studied this learning element, you are now ready to
practice

2. Determine the hand tools and materials you will need and ask your
instructor to provide you these.

3. Study the drawings of Assignments 1 and 2, determine the wood screws,
wallplugs and hand tools necessary.

4. You will mount the metal box first on wooden surface and then to
masonry wall.

5. Mount the box as shown in the working drawing. Follow the
measurements given.

6. Upon completion of the first Assignment, ask your instructor to check
yourwork.

7. Remove the components from the wooden surface and mount them onto
masonry surface.

8. Upon completion, ask your instructor to check your work.

9. Perform housekeeping.

Working Drawing:

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Information Sheet # 1.2-2

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LO2. INSTALL ELECTRICAL CIRCUIT

Learning Objectives: In an refrigeration and air conditioning shop scenario,
the trainee will be able to familiarize the different types and sizes of surface
non-metallic raceway, specifically, the plastic molding.

The Surface Non-Metallic Method (PlasticMolding):

1. Wiring electrical power circuits for window type air-conditioning unit can be
installed using the newest PVC electrical wire molding method. This method

issimilar to the surface metal raceway method which employs flat elbows,
and adaptor.

2. The wire moldings and fittings are made of non-metallic or PVC materials.
Below are the different types of cross-section drawing of the PVC wire

moldings.

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3. Each wire molding has snap cover which
fits securely over the base part.

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4. Among the fittings commonly used in the methodare internal and external
corner elbows and 90angular fitting.

5. When using this method surface type power
outlets and installation switches are most
appropriate. It uses specially designed metal
box suited for its applications.

6. The mounting of the moldings on wooden surface are small common nails or
wood screws can be used. Mounting on a masonry surface will require fillers

or plastic plugs into drilled holes and wooden screws.

7. The method has many advantages over the surface metal raceway method:
preparation is very easy because it is made of PVC it can be easily cut or
bend todesired shape or turn by applying miter joint.

8. When using the method, PEC provides that the following rules shall he
observe in wiring lighting and power circuits.

Size of Conductor. No conductor larger than that for which the raceway is
designed shall be installed in raceways/moldings.

Maximum number of conductors in Raceway/Molding. The combined
Crosssectional area of all conductors of the interior cross-sectional area
of the raceway or molding.

Splices and Taps. Splices and taps shall be made only in junction boxes.

Non-metallic surface raceway/wire moldings and their elbows and similar
fittings shall be so designed that the sections can be mechanically coupled
togetherwithout subjecting the wires to abrasion. Heads of screws shall
be flush with theraceway/molding surface.

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Self-Check #1.2-2
The Surface Non-Metallic Method (Plastic Molding)

LO 2. INSTALL ELECTRICAL CIRCUIT.

Answer the following question.
1. How does the PVC wire molding method differ with the surface metal
racewaymethod?
2. Enumerate at least three PEC requirements concerning PVC Wire Molding

method.

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ANSWER KEY #1.2-2
Self-Check of #1.2-2

1. The method has many advantages over the surface metal raceway method
preparation is very easy because it is made of PVC it can be easily cut or
bend to desired shape or turn by applying miter joint.

2. PEC rules and regulation on PVC molding. (any of the 3)

a. Size of Conductor – No conductor larger than that for which the raceway is
designed shall be installed in raceways/molding.

b. Maximum number of conductor in Raceway/Molding. The combine cross-
sectional area of conductor of the interior of the cross sectional area of the

raceway/molding.

c. Splices and Taps. Splices and taps shall be made only in junction boxes.

d. Non-metallic surface raceway/wire molding and their elbows and similar
fittings shall be so designed that the section can be mechanically coupled
together without subjecting the wires to abrasion. Heads of the screw shall

be flash with the raceway/molding surface.

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Information Sheet # 1.2-3

LO2. INSTALL ELECTRICAL CIRCUIT

Learning Objectives: In an refrigeration and air conditioning shop scenario,
the trainee will be able to familiarize the different types of over current-current
protection use in electrical installation.

Over-current Protection:

1. Over-current protection - Weak link
in the circuit that limits the
amperage to a specified amount.

2. Fuse and circuit breakers are
commonly used circuit protection.

3. Fuse damages itself when
over current or overload occurs in
the circuit while circuit breaker trips
when fault is detected and can be
reset after the fault is corrected.

4. Type "S' plug fuse -~ fuse with
Special size-limiting characteristics
for each amperage range

5. Edison-base plug fuse - Fuse with a
base that fits the same socket as a
regular based incandescent bulb.

6. Single-element fuse - Fuse that
contains only one element and is
not designed to carry an overload

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7. Dual-element fuse - Fuse that has
within it a thermal cutout element
with a time delay that permits
momentary harmless inrush
currents to flow without harming the
fuse

Note: Dual-element fuses should not
be confused with fuses with two
renewable links in a fuse cartridge.

8. Ferrule-type cartridge fuse - Fuse
with metal caps on a cylindrical
case. Standard ampere ratings are
15, 20, 30, 40 and 60 A.

9. Blade-type cartridge fuse - Fuse
with flat contact blades on a
cylindrical case. Standard
ampacities starts at 65 A.

10. Circuit breaker - Automatic
overcurrent device that trips on
overloads or shorts and is
resettable. Standard ampacities
starts at 15A.

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11. A thermal trip type of circuit
breaker. If current flow exceeds the
rated limit of the breaker, the
bimetallic strip heats and bends. As
the strip bends, the latching
mechanism is tripped and the
contacts open.

12. Electromagnetic Trip Type- As the
current flows through the breaker, it
creates a magnetic field within the
coil, the magnetic field interferes
and draws the core into the coil.
The metal trip bar is attracted to the
core forcing the latch to move, thus
opening the contact.

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Self-Check #1.2-3

LO 2. INSTALL ELECTRICAL CIRCUIT.

Over current Protection

A. MATCHING TYPE:
Direction: Match items related to over current protection with their correct
definitions.

B. ESSAY:
Direction: Answer the following questions briefly
1. Describe the operation of single element fuse

2. Describe the operation of dual element fuse.

3. List five types of over current protective devices.

4. Describe the differentiate between thermal trip and electromagnetic trip type
circuit breaker

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ANSWER KEY #1.2-3
Self-Check of #1.2-3

A.
1. C
2. D
3. E
4. A
5. B

B.
1. Under sustained overload conditions, the restricted portion of the
fuse element heat to their predetermined melting point, thus opening
and interrupting the flow of current.

2. Under sustained the overload condition, the trigger spring fracture
the fusing alloy and releases the “ S “ connector.

3. Edison base plug fuse. Type “ S “ plug fuse (fustat), Ferrule type
cartridge fuse, bladed type cartridge fuse and circuit breaker.

4. They both protect the circuit rom overload and short circuit. The
thermal type circuit breaker uses bimetal strips that heat and bends
the releases the latching mechanism to open the circuit while the

electromagnetic type uses coil that produces strong magnetic field
when overload / short circuit occurs to open the circuit.

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Information Sheet # 1.2-4

LO2. INSTALL ELECTRICAL CIRCUIT

Learning Objectives: In an refrigeration and air conditioning shop scenario,
the trainee will be able to familiarize the different types of safety switch and
circuit breaker enclosure and deal with NEMA standard safety switch and load
safety switch enclosure.

Load Center and Safety Switch Enclosures

1. Cabinet is an enclosure designed
either for surface or flush
mounting and provided with a
frame, mat, or trim in which a
swinging door or doors are or
may be hung.

2. Concentric knock-out- Several
removable metal rings that allow
for the entrance of various
standard sizes of connectors into
the cabinet.

Note: Standard concentric
knockout sizes are ½ inch,
¾ inch, 1 inch, 1 ¼ inches,
1 ½ inches, 2 inches and 2
½ inches

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3. Eccentric knockout- Knockout
that is removed in section to form
larger holes.

Types of Safety SwitchEnclosures

4. NEMA 1 (Indoor)
Note: NEMA 1 safety switchenclosure
maybe easilyidentified because of the
presence of concentricknockouts on
the top of theenclosure.

5. NEMA 3R (Rainproof)
Note: NEMA 3R safety
switchenclosures may be
easilyidentified by the presenceof a
hub plate on the top ofthe safety
switch.

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6. NEMA 4X (watertight, corrosion
resistance)
Note: NEMA 4X enclosures are
generally constructed ofstainless steel.

Safety Switch Configuration

Types of Load Center Enclosures

8. Flush Mount (NEMA 1)

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9. Surface Mount
(generally NEMA 1)

10. Exterior Surface

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Self-Check #1.2-4
LO 2. INSTALL ELECTRICAL CIRCUIT.

Load Center and Safety Switch Enclosures
IDENTIFICATION:
Direction: Identify the following enclosures and symbols.

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ANSWER KEY #1.2-4
Self-Check of #1.2-4

1. NENA 3R
2. NEMA 4X
3. Flush mount
4. Eccentric knock-out
5. NEMA 1
6. Exterior surface
7. 1 blade 1 fuse
8. 2 blades
9. 2 blades 2 fuse
10. 3 blades 3 fuse

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ASSIGNMENT SHEET #1.2-4

LO2: INSTALL ELECTRICAL CIRCUIT.

Objective:In air conditioning shop scenario, the trainee will be able to
familiarize the safety switch enclosure use in air conditioning area.

Identifying Load Center and SafetySwitch Enclosure:

1. Go to other buildings in your area (school premises).

2. Try to check the air conditioning unit installed in each building.

3. Determine what type of load center or safety switch enclosures they use.

4. Record your observation on the table provided below. Try to record as many
as you can.

5. Ask your instructor to check your work.

Rating Type of Enclosure Location
1.

2.

3.
4.
5.

6.

7.

8.
9.

10.

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Information Sheet # 1.2-5

LO2. INSTALL ELECTRICAL CIRCUIT

Learning Objectives: In an refrigeration and air conditioning shop scenario,
the trainee will be able to familiarize the different types of conductors and
insulators used in electrical installation.

Electrical Conductors and Insulators

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