Installing Window-Type Air-conditioning Units

9. Finalize the vertical line by measuring the
required height of the cavity along this line
and marking it (consider the mark as end
of the line). This line will now represent the
cavity side near the adjacent wall.

10. Place the edge of the level bar horizontally
to the upper end of the line that represents
the cavity side near the adjacent wall.
Make sure that the level bar is parallel with
the base line. Draw a line. This line will
now represent the upper side of the cavity.

The bubble must be at the center
of the tube to ensure that the bar
is parallel with the base line

11. Place level bar in the end of the base line
(vertically). Make sure that the level bar is
parallel with the line representing the side
near the adjacent wall. Draw a vertical line.
This line will represent the other side of the
cavity.

Again, the bubble must be at
the middle of the tube to
ensure that the bar is
parallel with the line that
represents the side of the
cavity near the adjacent wall

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12. Recheck the layout by measuring the
length of the lines. Make adjustment if
necessary.

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Assignment Sheet 4
Laying out cavity of air conditioning unit

After learning how to make a layout, you will be making a layout on your own. The
purpose of this activity is to enhance your skill in making layout.

Your tasks are:
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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Objectives: Job Sheet 3

Performing cavity works in concrete surface

At the end of this practice the learner/trainee should be able to:

o Prepare cavity for air-con unit to be installed
o Demonstrate the ability to use hand tools and power tools
o Demonstrate the safety practices in preparing cavity

works

Materials, Tools and Equipment: - 1 pc
- 1 qrt
Materials:
o Concrete grinding disc - 1 pc
o Paint* - 1 pc
- 1 pc
Tools:
o Extension cord - 1 set
o Cold chisel
o Ballpeen hammer - 1 pc
o Paint Brush* - 1 pc
- 1 pair
Equipment
o Portable grinder

Personal Protective Equipment
o Goggles
o Gloves
o Safety shoes

* - Item is optional

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Introduction:
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).

Procedure:
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.

2. Chip out the cut lines to
remove unwanted
concrete

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

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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.

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Objectives: Job Sheet 4

Performing cavity works in wooden surface

At the end of this practice the learner/trainee should be able to:

o Prepare cavity for air-con unit to be installed
o Demonstrate the ability to use hand tools and power tools
o Demonstrate the safety practices in preparing cavity

works

Materials, Tools and Equipment: - 1 pc

Materials: - 1 unit
o Concrete grinding disc - 1 unit
- 1 unit
Tools: - 1 unit
o Hacksaw - 1 unit
o Extension cord - 1 unit
o Cold chisel
o Wood chisel - 1 set
o Ball peen hammer - 1 set
o Cross cut saw* - 1 set

Equipment - 1 pc
o Portable grinder - 1 pc
o Portable hand drill - 1 pc
o Portable jig saw - 1 pair

Personal Protective Equipment
o Goggles
o Ear plug/mop
o Gloves
o Safety shoes

* - Item is optional

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).

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Perform cavity works on wooden surface

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

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)

Rough edge

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Objectives: Job Sheet 5

Performing cavity works in window sills

At the end of this practice the learner/trainee should be able to:

o Prepare cavity for air-con unit to be installed
o Demonstrate the ability to use hand tools and power tools
o Demonstrate the safety practices in preparing cavity

works

Materials Tools and Equipment:

Tools: - 1 pc
o Hacksaw - 1 set
o Flat screw driver

Personal Protective Equipment - 1 pc
o Goggles - 1 pc
o Ear plug/mop - 1 pc
o Gloves - 1 pair
o Safety shoes

* - Item is optional

Procedure:

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

1. Remove all obstructions where
the unit will be installed, this
may include:
a. Removing of window
glass or pane

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b. Cut steel braces

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.

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Install Electrical Circuit

Assessment Criteria:

The learning outcome stated above is attained if you can
demonstrate the following:

 Electrical materials, tools and equipment are prepared according
to job requirements.

 Electrical components are rigidly installed in building structures.
 Installed electrical circuit is tested according to standard

procedures.
 Electrical installation is done in accordance with the latest

provision of PEC.

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Information Sheet 4
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.

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

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.

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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 mm long is suitable.

8. If you mount components and
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.
In this case a flat washer with an
inside diameter of 5.5 mm
should be used.

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9. It the housing is to be mounted
onto a wooden surface, use a
GARNISH AWL' to make a small
hole from the center of each
marked, out circle.

10. 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.

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13. If YOU are using large wood
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.

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

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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 be
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.

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

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.

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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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Assignment Sheet 5

Mounting of components and fixtures using wood
screws and wall plugs

1. Having read and studied this learning element, you are now ready to practice the
mounting of components and fixtures using wood screws and wall plugs.

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, wall plugs 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 your work.
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.

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800 mm

1,800 mm

350 mm

Finished floor

Working Drawing
(not to scale)

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Information Sheet 5

The Surface Non-Metallic Method (Plastic Molding)

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

4. Among the fittings commonly used in the method are internal and external corner elbows
and 90 angular 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 to desired 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.

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 Maximum number of conductors in Raceway/Molding. The combined cross
sectional 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 together
without subjecting the wires to abrasion. Heads of screws shall be flush with the
raceway/molding surface.

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Self-Check 4

The Surface Non-Metallic Method (Plastic Molding)

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

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Information Sheet 6

Overcurrent Protection

1. Overcurrent 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
overcurrent 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 5

Overcurrent Protection

MATCHING TYPE:
Direction: Match items related to overcurrent protection with their correct definitions.

1. Fuse with flat contact blades on a a. Ferrule type cartridge fuse
cylindrical case. b. Overcurrent protection

2. Fuse with a base that fits the c. Blade-type cartridge fuse
same socket as a regular based
incandescent lamp. d. Edison base or plug type fuse
e. Circuit breaker
3. Automatic overcurrent device that
trips on overloads or shorts and f. Single element fuse
is resettable.

4. Fuse with metal caps on a
cylindrical case.

5. Weak link in the circuit that limits
the amperage to a specified
amount

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 overcurrent protective devices.
4. Describe the differentiate between thermal trip and electromagnetic trip type circuit

breaker

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Information Sheet 7

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

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

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Types of Safety Switch Enclosures
4. NEMA 1 (Indoor)

Note: NEMA 1 safety switch
enclosure maybe easily
identified because of the
presence of concentric
knockouts on the top of the
enclosure.

5. NEMA 3R (Rainproof)
Note: NEMA 3R safety switch
enclosures may be easily
identified by the presence of
a hub plate on the top of the
safety switch.

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

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7. Safety Switch Configuration

Types of load center enclosures
8. Flush Mount (NEMA 1)

9. Surface Mount
(generally NEMA 1)

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10. Exterior Surface

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Self-Check 7

Load Center and Safety Switch Enclosures

IDENTIFICATION:
Direction: Identify the following enclosures and symbols.

1. ____________ 2. __________
3. __________ 4. __________

5. __________ 6. __________

7. __________ 8. __________ 9. __________ 10. _________

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Assignment Sheet 6
Identifying Load Center and Safety Switch Enclosure

1. Go to other buildings in your area (school premises).
2. Try to check the airconditioning 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 8
Electrical Conductors and Insulators

11. Electricity is a flow of electrons.

ATOM

12. Some materials will not give up
their electrons, and these
materials are called insulators.

13. Electricity does not travel easily
through certain materials like
rubber, thermoplastic, glass,
varnish and asbestos. These
materials are known as
insulators.

14. Some materials like metals give
up their electrons. These
materials are called
conductor. It allows electricity
to flow through easily. Metals
(such as silver, copper,
aluminum, bronze and iron) are
good conductors.

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15. That’s why electrical wires are
made of metal.

16. Electrical conductors may be
solid or stranded. Solid wire is
an insulated single conductor
while stranded wire is usually
several strands twisted
conductor.

17. Wires commonly used in
electrical wiring vary in sizes.
The common standard used to
determine the size of wire is the
American Wire Gauge (also
known as Brown and Sharp
gauge)

18. American Wire Gauge is an 14 AWG = 2.0 mm2
12 AWG = 3.5 mm2
English System of 10 AWG = 5.5 mm2
8 AWG = 8.0 mm2
measurements. The following

are the equivalents of wire

sizes to metric system.

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Information Sheet 9

Selecting Electrical Conductors for Installation

1. Electrical wires are insulated with different types of insulators and they are used to keep
electricity from leaving the conductors it travels on.

2. Ampacity is the current in amperes that a conductor can carry continuously under the
conditions of use without exceeding its temperature rating.

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3. Allowable Ampacities of Insulated Conductors. (PEC Part I, Vol. 1, 2000)

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4. Factors that determine the conductor type and size are the following:
a. Full load current.
b. Number of conductors
c. Type of load served
Example:
Single motor requires conductors for 125% of full load ampacity [Section 4.30.2.2(a)
PEC 2000]
d. Length of run
e. Ambient temperature
Example:
Rooftop temperatures in summer approach the water boiling point of 100oC (212oF)
f. Voltage
Most conductors for general use are rated for 600V. Higher voltage ratings are
generally specified on a special order.

Example:
Select the appropriate conductor type and size of the motor nameplate below. The

nameplate indicates that the motor is rated 1.5 horsepower, 110/220V. Let us assume
that the motor will be operated in 220V source and 50oC ambient temperature.

Full load current is determined through Table 4.30.14.2, this is the provision in
Philippine Electrical Code 2000 under Section _________.and not through the motor
nameplate FLA.

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Table 4.30.14.2 Full Load Current in Amperes,
Single Phase Alternating Current Motor

HP 115 V 200V 208 V 230 V

1/6 4.4 2.5 2.4 2.2

¼ 5.8 3.3 3.2 2.9

1/3 7.2 4.1 1.0 3.6

½ 9.8 5.6 5.4 4.9

¾ 13.8 7.9 7.6 6.9

1 16 9.2 8.8 8.0

1½ 20 11.5 11.0 10

2 24 13.8 13.2 12

3 34 19.6 18.7 17

Thus, the full load current of 1.5 horsepower is 10 A as obtained in the table
above.

Single motor requires conductors for 125% of full load ampacity [Section 4.30.2.2(a)
PEC 2000]

Therefore;

Full Load Current = 10A X 125%
= 12.5 A

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Let us now find the size and type of conductor. We will be using Table
3.10.1.16. Note that the ambient temperature is 50oC.

Let us use copper
conductor. In the 2nd
column of the table, you’ll
see the operating
temperature of 60oC for
TW and UF type of
conductor.

We will find that 2.0 mm2
can be used because it
has the ampacity of 20
ampere. (Note that the
computed full load
current is 12.5A)

But wait! We haven’t done yet!

We have to consider the
correction factor for the
given ambient
temperature which is
50oC

The ampacity correction factor
for 46-50oC is 0.58.

Therefore, the ampacity of
2.0mm2 wire which is 20A at 50oC
will be;

20 A X 0.58 = 11.6A

This indicates that we can not
use 1.6mm2 wires.

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All we have to do is to take the next
bigger conductor which is 3.5mm2 that
has 25 A ampacity.

Let us check using the ampacity
correction factor;

25 A X 0.58 = 14.5 A
This is enough to carry the load of
12.5 A

Another option is to take the third
column, 75oC operating temperature
type THW or THWN copper conductor

2.0mm2 type THW or THWN has
ampacity of 20A. Let us check if this
suitable using the ampacity correction
factor.

20 A x 0.75 = 15 A

This is enough to carry the load of
12.5 A

Hence, for 1.5 Hp, 220V motor,
50oC ambient temperature, we can use
3.5mm2 TW or 2.0mm2 THW or THWN
conductor.

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Assignment Sheet 7

Select Conductors for Various Ampacities and
Temperatures

The technician must be able to select proper conductors for various ampacities and
temperatures. This skill requires that the technician be able to locate and read Philippine
Electrical Code tables.

Directions: Select conductors for various ampacities and temperatures. Use the Philippine
Electrical Code, Table 3.10.1.16. Use the ampacity correction factor for temperature
rating column that is the same or the next higher rating than the required
temperature, and then select the size of conductor for the required or next higher
ampacity. Refer only to the sizes given for copper wiring.

Examples: What wire size is required for a load of 55 amperes at 30°C? The
answer is 14mm2 (#6 AWG). This is obtained by referring to the 60°C
column because the required temperature is not above 60°C. You must
then check the ampacity correction factor. The ampacity correction
factor under 26-30oC is 1.0.

Amperes Temperature Wire Size
Per PEC Table 3.10.1.16
20 65oC
35 75oC
37 85oC
110 87oC
120 65oC
232 75oC
400 65oC
67 65oC
83 75oC
190 70oC

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Assignment Sheet 8

Select Conductors for Given Horsepower Rating of the
Load

Directions: Select conductors for the given horsepower of the load. Use the Philippine Electrical
Code, Table 3.10.1.16. Use the ampacity correction factor for temperature rating
column that is the same or the next higher rating than the required temperature, and
then select the size of conductor for the required or next higher ampacity. Refer
only to the sizes given for copper wiring. You can go over Information Sheet 6 again
if you find some difficulties in selecting conductor size and type.

Horsepower Temperature Wire Size
2 65oC Per PEC Table 3.10.1.16
1 75oC
3 85oC
¼ 87oC
¾ 65oC
75oC
2½

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Job Sheet 6

Performing single outlet electrical installation for
window type air-conditioning unit. (Surface Non-
metallic Raceway)

Objectives: At the end of this practice the learner/trainee will be able to:
o Select appropriate location for the electrical components to be

installed.
o Layout mounting location of the electrical components based on

working drawing
o Install wiring devices
o Install surface non-metallic raceway and electrical wiring

Tools, Materials and Equipment Needed

Equipment: - 1 unit
o *Electric drill
- 1 pc
Materials: - 1 pc
o Pencil or Chalk - 15 pcs
o Installation plan or working drawing - 15 pcs
o Flat head screw, ¾ in X 10 - 2 pcs
o *Fisher, # 6 (Tox) - 1 pc
o Plastic molding ¾ in X 8 ft. - 1m
o Surface metal box (Amco Box)
o Mica tube, ¼ in. dia. - 1 pc
o Stranded wire, 2.0 mm2 TW
o ACU outlet, 3 prong - 1 pc
o Safety switch, 30 A
- 1 pc
Tools: - 1 pair
o Pull and push rule or any measuring - 1 pc
- 1 pair
device suited for the activity
o Steel meter stick/Straight edge

Personal Protective Equipment:
o Safety glass
o Gloves
o Goggles
o Safety shoes

* - Item is optional

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Procedure:
Roughing-in activities of electrical installation deal with marking-out locations of

electrical components, mounting of electrical boxes, raceways and metal circuit protection
enclosures.

1. Identify the locations of the
components to be installed. There are
some provisions where we need to
consider like:

a. Distance of the convenience Not less
outlet away from the unit than
and from the ground. The
outlet must be not more 300 mm
than 1 meter away from the
unit and not less than 300
mm above finished floor.

b. The fuse box (if installed 1,600

separately from the main mm

circuit breaker) must be
installed at least 1.2 m – 2

m above finished floor

.

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2. After determining the exact location of
the components, start mounting the
safety switch. Hold the safety switch
on determined location, level it and
mark-out the holes of the safety switch
on the wall.

3. Mark the path where the moldings will
pass through

4. Install a mounting screw for the top
mounting hole and then the remaining
two bottom screws.

Note: If you are installing on concrete
walls, you have to drill holes
and insert filler plugs before
mounting any components on
the wall.

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5. Hang switch box on the screw.
Note: The hole in the upper middle
back of the housing should slip
over the screw head

6. Next component to be installed is the
base of surface metal box.
Disassemble the surface metal box
and mark-out the holes on wall.(as
what you did in procedure 3)

7. Mount the base of surface metal box
using 4 pcs of flathead screws.

8. Next is the backing of plastic molding.
Mark-out the holes of plastic molding
against the wall. Make sure that the
plastic molding is leveled horizontally
or vertically as the case may be during
marking–out procedures.

Note: Provide an ample space for
mica tube between the end of the
molding and safety switch.

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9. Install the backing of the plastic
molding.
Note: Plastic molding is provided with
holes for screws, if you think
the holes provided are not
enough to hold the backing in
place, bore additional holes into
it using gimlet or portable drill.

Insert the backing of
molding in the slot provided.

10. In angular turns, miter joints must be
used to facilitate comfortable laying
out of conductors.

11. Lay-out the conductors, insert 2-
5.5mm2 wires together with 1-2.0mm2
wire for grounding conductor, if the
length of the conductor to be used is
determined, cut it, and make sure that
you provide ample allowance for
splicing and terminating to the wiring
devices and circuit protection. Provide
¼ inch mica tube to protect the
conductors from abrasions.

Code No. Installing Window Type Date: Developed Date: Revised Page #
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