CEERS REVIEW CENTER
EE REVIEW SEPTEMBER
APRIL2022
2022 2021
APRIL
PEC
Doña Esperanza Village, Tisa, Cebu City
Tel. No. 261-2244
email add: ceers.philippines@yahoo.com
BRANCH CIRCUIT
❑ PERMISSIBLE LOAD
(a) 15- and 20-ampere branch circuit- A 15- or 20 –
ampere branch circuit shall be permitted to
supply lighting units or other utilization
equipment, or a combination of both.
1. Cord-and –plug Equipment not Fastened in place.
The rating of any one cord-and-plug connected
utilization equipment not fastened in place shall
not exceed 80 percent of the branch circuit
rating.
2. Utilization equipment not Fastened in place. The
total rating of utilization equipment not fastened
in place other than luminaires shall not exceed
50 percent of the branch circuit rating where
lighting
units,
cord-and-plug
connected
utilization equipment not fastened in place, or
both, are also supplied
Ex. 1. The rating of any one cord-and-plug connected appliance
used in a 20-ampere branch circuit shall not exceed _____
amperes.
Ex. 2. The total rating of appliances not fastened is in place
connected to a 20-amp branch circuit which also supplies lighting
units shall not exceed _____ amps
(b) 30 ampere branch circuits; A 30-ampere branch circuit shall
be permitted to supply fixed lighting units with heavy duty
lampholders. A rating of any one cord-and-plug connected
utilization equipment shall not exceed 80 percent of the branch
circuit ampere rating.
(c) 40-and 50-ampere branch circuit. A 40-and 50-amperes
branch circuit shall be permitted to supply cooking appliances
that are fastened in place in any occupancy
(d) Branch circuits larger than 50 amperes Branch circuits larger
than 50 ampere shall supply only nonlighting outlet loads.
A dwelling unit is defines as “one or more rooms” with provision
for eating, living, sleeping, cooking, and sanitation.
➢
For a dwelling the code lists only 3 rules you
shall have when sizing the service.
1. Lighting load for listed Occupancies. A unit load of not less
than that specified for occupancies listen therein shall constitute
the minimum lighting load for each square meter of floor area.
The floor area for each floor shall be computed from the outside
dimensions of the building, apartment, or other area involved.
For dwelling unit(s),the computed floor area shall not include
open porches, garages, or unused or unfinished spaces not
adaptable for future use.
2. In each dwelling unit the feeder load shall be computed at
1500 volt-amperes for each 2-wire small appliance branch
circuit required for small appliances supplied by 15 or 20 ampere
receptacles on 20 ampere branch circuits in the kitchen. Where
the load is subdivided through two or more feeders, the
computed load for each shall include not less than 1500 voltamperes for each 2-wire branch circuit for small appliances.
These loads shall be permitted to be included with the general
lighting load and subjected to the demand factors permitted
for the general lighting load.
3. A feeder load of not less than 1500 volt-ampere shall be
included for each 2-wire laundry branch circuit installed as
required by . It shall be permissible to include this load with
the general lighting load and subject it to the demand factors
provided.
These are the 3 items you shall have in a dwelling:
➢
➢
➢
24va per sq meter of living area
2 small appliance circuits at 1500va each
1 laundry circuit at 1500va
v. RANGE LOAD
Lighting and Receptacle Loads
a. Lights
b. Stereo
c. Dresser Lamp
d. Floor Lamp
e. Table Lamp
f. Television Set
g. Vacuum Cleaner
Small Appliances
a. Coffee Maker
b. Refrigerator
c. Food Mixer
d. Deep Fryer
e. Toaster
f. Blender
g. Hand Iron
Fixed Appliance Load
a. Ranges
b. Water Heaters
c. Dryers
d. Dishwasher
e. Disposer
GENERAL METHOD
I. GENERAL LIGHTING AND CONVENIENCE RECEPTACLES LOAD
a. Lighting and convenience receptacle load, 24 VA
per sq
meter.
b. Minimum of two small appliance circuits
c. Laundry Load
II. Air conditioning units and Heating load. (Noncoincident
Loads)
III. Fixed appliances or Fastened in place appliances
For three or less appliances , D.F. =100%
For four or more appliances, D.F.= 75%
IV. DRYERS
[1/3]
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CEERS REVIEW CENTER
APRIL 2022 2021
EE REVIEW SEPTEMBER
PEC
Doña Esperanza Village, Tisa, Cebu City
Tel. No. 261-2244
email add: ceers.philippines@yahoo.com
Types of Occupancy
Unit Load per
Sq. M. (Volt-Amperes)
Armories & Auditoruim
8
Banks
28**
Barber Shops and Beauty Parlor
24
Churches
8
Clubs
16
Court Rooms
16
*Dwelling Units
24
Garages – Commercial (Storage)
4
Hospitals
16
*Hotels and Motels, including apartment houses without provisions for
cooking by tenants
16
Industrial Commercial (Loft) Building
16
Lodge Rooms
Example. 5.
What is the general lighting and receptacle demand
load for dwelling 300 m2 area.
➢
12
Office Buildings
28**
Restaurants
16
Schools
24
Stores
24
Warehouses (storage)
2
In any of the above occupancies except one-family dwelling and individual
dwelling units of two-family and of multifamily dwellings:
Assembly Halls and Auditoriums
Halls, Corridors, Closets, Stairways
Storage Spaces
8
4
2
Table 2.20.3.3 Feeder Demand Factors for General
Lighting Load and Small Appliance Load
Types of Occupancy
Dwelling Units
*Hospitals
*Hotels and Motels –
Including
Apartment Houses
Without Provision for
Cooking by Tenants
Warehouses
(Storage)
All Others
Example.4.
Determine the minimum small appliance and laundry
loads required in a dwelling
Portion of Lighting Load to Which
Demand Factor Applies
(volt-amperes)
First 3 000 or less at
From 3 001 to 120 000 at
Remainder over 120,000 at
…………….
First 50 000 or less at
Remainder over 50 000 at
……………..
First 20 000 or less at
From 20 001 to 100 000 at
Remainder over 100 000 at
……………
First 12,500 or less at
Remainder over 12 500 at
……………..
Total Volt-amperes
……………………..
Demand
Facto
r
Percent
100
35
25
40
20
50
40
30
100
50
Fixed or fastened in place appliances. The fixed
appliance load is determined by adding wattage (voltamp) values from appliance nameplates for three or
less fixed appliances. If there are four or more fixed
appliances, 75% of the wattage values on the
nameplate is permitted. This demand factor does not
apply to ranges, dryers, air conditioners, or space
heating units.
Example: 6.
Determine the demand load for the following fixed
appliances.
Water heater load
6000 watts
Dishwasher load
1500 watts
Compactor
900 watts
Disposal load
800 watts
Vent fan load
400 watts
Attic fan load
1600 watts
➢
Number of
Dryers
Demand Factor
(Percent)
1–4
5
6
7
8
9
10
11
12 – 22
100%
85%
75%
65%
60%
55%
50%
47%
% = 47 – (number of dryers – 11)
23
35%
24 – 42
% - 35 - [0.5 x (number of dryers – 23)]
43 and over
25%
Example: 7.
Determine the demand load for six dryers rated at 5 kw
each.
Electric cloths Dryers ,- Dwelling Units. The load for
household electric clothes dryers in dwelling unit shall
be either 5000 watts (volt-amp) or the nameplate rating
, whichever is larger, for each dryer served. The use of
demand factors shall be permitted.
Tables 2.20.3.15 Demand Factors for Household Electric
Clothes Dryers
100
*The demand factors of this table shall not apply to the
calculated load of feeders or services supplying areas in
hospitals, hotels, and motels where the entire lighting is likely to
be used at one time, as in operating rooms, ballrooms, or dining
rooms.
Example.3.
Determine the lighting and receptacle loads for a
dwelling unit of 400 m2
pec
[2/3]
CEERS REVIEW CENTER
EE REVIEW SEPTEMBER
APRIL 2022 2021
PEC
Doña Esperanza Village, Tisa, Cebu City
Tel. No. 261-2244
email add: ceers.philippines@yahoo.com
Tables 2.20.3.16 Demand Factors and Loads for
Household Electric Ranges, Wall-Mounted Ovens,
Counter-mounted Cooking Units, and Other Household
Cooking Appliances over 1 ¾ kW Rating
(Column C to be used in all cases except as otherwise
permitted in Note 3.)
Demand Factor(Percent)(See Notes)
Column A
(Less than 3 ½
kW Rating)
Column B
(3 ½ than 8 ¾ kW
Rating)
1
80%
80%
2
75%
65%
11kW
3
70%
55%
14 kW
4
66%
50%
17 kW
5
62%
45%
20 kW
6
59%
43%
21 kW
7
56%
40%
22 kW
8
53%
36%
23 kW
9
51%
35%
24 kW
10
49%
34%
25 kW
11
47%
32%
26 kW
12
45%
32%
27 kW
13
43%
32%
28 kW
14
41%
32%
29 kW
15
40%
32%
30 kW
16
39%
28%
31 kW
17
38%
28%
32 kW
18
37%
28%
33 kW
19
36%
28%
34 kW
20
35%
28%
35 kW
21
34%
26%
36 kW
22
33%
26%
37 kW
23
32%
26%
38 kW
24
31%
26%
39 kW
25
30%
26%
40 kW
26 - 30
30%
24%
15 kW+ 1
31 - 40
30%
22%
kW for each range
41 - 50
30%
20%
25 kW + ¾
51 - 60
30%
18%
kW for each range
61 and over
30%
16%
Number of
Appliances
Column C
Maximum
Demand(kW)
(See Notes)
(Not over 12
kWRating)
8kW
Example 9. What is the demand load for twenty 8 kW household
ranges?
Example 10. What is the demand on the service for 25 – 8.5 kW
ranges?
Example 11. What is the demand load on the service for two 12
kW ranges?
Example 12. What is the demand load on the service for 4 – 3
kW counter-mounted cooktops?
[3/3]
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NOTES: PEC MOTORS
Doña Esperanza Village, Tisa, Cebu City
Tel. No. 261-2244
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STEP 5: Feeder wire size
STEP 4: Branch circuit overcurrent device
STEP 6:
Feeder overcurrent
device
STEP 3: Branch circuit wires
STEP 2: Overload
M
M
STEP 1: F.L.C
Step 1 FLC (Full-Load Current)
Full-load currents in Amperes, Single-phase Alternating current Motors
HP
1/6
1/4
1/3
1/2
3/4
1
1½
2
3
5
7½
10
115V
4.4
5.8
7.2
9.8
13.8
16
20
24
34
56
80
100
200V
2.5
3.3
4.1
5.6
7.9
9.2
11.5
13.8
19.6
32.2
46.0
57.5
208V
2.4
3.2
4.0
5.4
7.6
8.8
11
13.2
18.7
30.8
44.0
55.0
230V
2.2
2.9
3.6
4.9
6.9
8
10
12
17
28
40
50
Full-load Current, Three-Phase Alternating-Current Motors
Induction Type
Squirrel-Cage and Wound-Rotor (Amperes)
Synchronous Type Unity Power
Factor (Amperes)
HP
115V
200V
208V
230V
460V
575V
2300V
230V
460V
½
3/4
1
1½
2
3
5
7½
10
15
20
25
30
40
50
60
75
100
125
150
200
250
300
350
400
450
500
4.4
6.4
8.4
12.0
13.6
---------------------------------------------
2.5
3.7
4.8
6.9
7.8
11.0
17.5
25.3
32.2
48.3
62.1
78.2
92
120
150
177
221
285
359
414
552
-------------
2.4
3.5
4.6
6.6
7.5
10.6
16.7
24.2
30.8
46.2
59.4
74.8
88
114
143
169
211
273
343
396
528
-------------
2.2
3.2
4.2
6.0
6.8
9.6
15.2
22
28
42
54
68
80
104
130
154
192
248
312
360
480
-------------
1.1
1.6
2.1
3.0
3.4
4.8
7.6
11
14
21
27
34
40
52
65
77
96
124
156
180
240
302
361
414
477
515
590
.9
1.3
1.7
2.4
2.7
3.9
6.1
9
11
17
22
27
32
14
52
62
77
99
125
144
192
242
289
336
382
412
472
------------------------------16
20
26
31
37
49
60
72
83
95
103
118
----------------------53
63
83
104
123
155
202
253
302
400
-------------
----------------------26
32
41
52
61
78
101
126
151
201
-------------
575V
----------------------21
26
33
42
49
62
81
101
121
161
-------------
2300V
-----------------------------12
15
20
25
30
40
-------------
Step 2 Motor branch – circuit Over load current protection
Motor Service Factor
.
Motor ratings are based on a service factor stamped on
the on the plate of the motor, ranging from 1.00 to 1.35.
If for a specific motor the service factor is 1.00, it means
that if the motor is installed in a location where the
ambient temperature is not over 40o C or 104o F, it can
deliver its rated horsepower continuously without harm.
But if the service factor is, for example 1.15, it means
that the motor can be used up to 1.15 times its rated
horsepower under the same conditions. For example, a
10 hp motor has a service factor of 1.15, the motor can
be allowed to develop 11.5 hp without causing undue
Pec motors
[1/5]
CEERS REVIEW CENTER
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deterioration to the insulation. The higher service factor
provides temporary extra power if needed.
Temperature Rise.
Current passing through the windings of a motor results in an increase in the motor
temperature. The difference between the winding temperature of the motor when running and the
ambient temperature is called the temperature rise.
The temperature rise produced at full load is not harmful if it does not exceed 40oC (104oF).
Higher temperature caused by increased current or higher ambient temperatures produces a
deteriorating effect on the motor insulation and lubrication.
Allowable Ampacities of Insulated Conductors Rated 0 – 2000V, 60C through 90C, Not
More Than Three Current – Carrying Conductors in Raceway, Cable or Earth (Directly
Buried), Based on Ambient Temperature of 30C
Temperature Rating of Conductor. See Table 3.10.1.16
Size
mm
2
60C
75C
90C
60C
75C
90C
TYPES
+TW
+UF
TYPES
+FEPW,
+RH
+THHW
+THW,
+THWN,
+XHHW,
+USE, +ZW
TYPES
TBS,
SIS,
+FEP
+FEPB,
+RHH,
+THHN,
+THHW
+XHHW
TYPES
+TW
+UF
TYPES
+RH,
+RHW
+THHW,
+THW
+THWN,
+XHHW,
+USE
TYPES
TBS,
SIS, +RHH
+THHW,
+THHN,
+XHHW
All Other Motors.
Motor with a service factor less than 1.15 or a temperature rise more than 40oC would be classified
All other motors.
Branch Circuit Overload Protection
Classification
Motors marked with service factor 1.15
or greater
Motors with a marked temperature rise
40C or less
All other motors
Overload Device
125%
Overload Relay
140%
125%
140%
115%
130%
Example 1:
What is the minimum size running overload
protection for a 1 ½-hp 230-V single-phase
squirrel cage motor? FLC = 10 A.
Example 2:
What is the minimum size running overload
protection for the motor in Problem 1 with a
service factor of 1.2
Step 3. Branch Circuit Conductor Sizing
Branch circuit conductors supplying a single motor shall have an ampacity not less than 125%
of the motor full load current rating.
COPPER
2.0
3.5
5.5
8.0
14
22
30
38
50
60
80
100
125
150
200
250
325
400
500
20
25
35
50
55
70
90
100
120
135
160
185
210
240
280
315
370
405
445
20
25
35
50
65
85
110
125
145
160
195
220
255
280
330
375
435
485
540
25
30
40
55
70
90
115
130
150
170
205
225
265
295
355
400
470
515
580
ALUMINUM OR COPPER
ALUMINUM
…
…
20
20
25
30
30
40
40
50
55
65
65
80
75
90
95
110
100
120
120
145
140
170
165
200
185
225
220
265
255
305
305
365
335
405
370
440
CLAD
…
25
35
45
65
80
90
105
125
135
165
190
225
250
300
345
410
460
495
Example 3.
What must be the ampacity of the conductor required for a 1 hp single-phase 115 V motor?
FLC = 16 A
Example 4.
A room air conditioner is to be attached to an individual branch circuit. If the load is 16A,
what is the minimum size of branch circuit required?
[2/5]
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EE REVIEW APRIL 2021
NOTES: PEC MOTORS
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AMPACITY CORRECTION FACTORS
Ambient Temp. C
21-25
26-30
31-35
36-40
41-45
46-50
51-55
56-60
61-70
71-80
For ambient temperature other than 30C lasting for three hours or
more, multiply the ampacities shown above by the appropriate factor
shown below
1.08
1.05
1.04
1.08
1.05
1.04
1.00
1.00
1.00
1.00
1.00
1.00
0.91
0.94
0.96
0.91
0.94
0.96
0.82
0.88
0.91
0.82
0.88
0.91
0.71
0.82
0.87
0.71
0.82
0.87
0.58
0.75
0.82
0.58
0.75
0.82
0.41
0.67
0.76
0.41
0.67
0.76
…
0.58
0.71
…
0.58
0.71
…
0.33
0.58
…
0.33
0.58
…
…
0.41
…
…
0.41
The table shown are correct if you don’t install over three current carrying conductors in a raceway or
o
cable or exceed 30 F in ambient temperature
When there are more than three current carrying conductors in a raceway or cable the ampacity of
each conductor must be reduced
A’
=
CF
AF
A’
=
=
=
ampacity of any other condition
Correction Factor (CF = 1 at 30oC)
adjustment factor (AF=1 if not more than 3 conductors)
A (CF)(AF)
Example 5.
2
A cable contains four current carrying 30 mm THW conductors in an ambient temperature
o
o
of 24 C. The ampacity of the conductor of an ambient temperature of 30 C and not more
than three conductors on the raceway is 110 amp. What is now the ampacity of the
conductor?
Example 6.
What size TW insulation copper conductor is required for a 1 hp single-phase 115 V motor?
FLC=16 A
Step 4. Branch Circuit Overcurrent Device
The motor branch circuit short-circuit and ground –fault protective device shall be capable of
carrying the starting current of a motor. A protective device having a rating or setting not exceeding
the maximum value calculated according to the values given in table shall be used.
Maximum Rating or Setting of Motor Branch-Circuit Short-Circuit and Ground-Fault
Protective Devices
Table 3.10.1.15 (b)(2)a, ADJUSTMENT FACTORS
Adjustment factors for more than three current – carrying conductors in a Raceway or
Cable
Number of Current – Carrying Conductors
4-6
7-9
10-20
21-30
31-40
41 and above
Percent of values of Tables as Adjusted for
Ambient Temperature if Necessary
80%
70%
50%
45%
40%
35%
o
When a conductor is installed in an ambient above or below 30 C a correction factor must be applied.
To determine the ampacity of a conductor, multiply the ampacity as given in the table by the
appropriate adjustment factor, the product multiplied to the correction factor.
Let A
=
ampacity when not more than three conductors in
a
Percent of Full-load Current
Type of Motor
Non-time
Delay Fuse
Single-phase motors
300%
DualElement
(TimeDelay) Fuse
175%
Instantaneous
Trip Breaker
Inverse
Time
Breaker
AC Polyphase motors other than
wound-rotor squirrel cage
Other than Design E
Design E
Synchronous Motors
Wound rotor
800%
250%
300%
300%
300%
150%
175%
175%
175%
150%
800%
1100%
800%
800%
250%
250%
250%
150%
Direct current
150%
150%
250%
150%
raceway,
based on ambient temperature of 30oC
Pec motors
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Step 6.
Feeder Overcurrent Protection
A feeder supplying a fixed motor load (s) and consisting of proper conductor sizes shall be
provided with a protective device having a rating or setting of not less than the largest rating or
setting of the branch circuit short circuit and ground –fault protective device (fuse or breaker) for any
motor of the group, plus the sum of the full-load currents of the other motors of the group.
Example 7:
A motor with a FLC of 10 amps would require
what size of inverse time breaker?
Example 8:
What size dual element fuse is required for a 1
½-hp single-phase, 230-V motor? FLC = 10 A
Example 13:
Two single-phase motors (FLC = 10 A) are
connected across a 230-V single-phase feeder.
Each motor is protected by a 25-A CB. What size
inverse time CB is required for the feeder
overcurrent device?
Example 9:
What is the maximum size inverse time circuit
breaker for a 2-hp single-phase, 115-V motor?
FLC = 24 A.
Step 5. Feeder Conductor Size
Multiply the largest rated motor in FLC by 125% and add the FLC of all other motors
connected to the same feeder for the total amps. From the calculated ampacity determine the proper
conductor size from the table.
Example 10:
What is the feeder conductor ampacity
required for two 2-hp single-phase 115-V
motors? FLC = 24 A
Example 11:
Two 25-hp three-phase, 208 V motors are fed
by the same feeder, the feeder conductor
would be required to carry a minimum of how
many amps? FLC = 74.8 A
Example 14:
Two single-phase motors (FLC = 20 A) are
connected across a 120-V single-phase feeder.
Each motor is protected by a 35-A fuse. What size
dual element fuse is required for the feeder
overcurrent device
Example 15:
Three 3-phase motors are connected to a 480 V, 3phase feeder. Motor A (FLC = 7.6 A), 25-A fuse
protective device; Motor B (FLC = 11 A), 35-A fuse
protective device; and Motor C (FLC = 14 A), 45-A fuse
protective device. Determine the size of a non-time
delay fuse required for the feeder overcurrent
protection?
Example 12:
What is the minimum size copper feeder
conductor permitted using TW insulation for a
5- hp (FLC = 28 A), single phase, 230-V and a 2hp (FLC = 12 A), single phase, 230-V motors?
[4/5]
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❑
Motor Compressor (Hermetic motors)
Overcurrent protection
Minimum setting – not exceeding 175%
Maximum setting – not exceeding 225%
➢
Overload – not more than 125% for fuse and CB, 140% for overload relay
➢
Disconnecting means – 115%
Standard ampere ratings of Protection
15
20
25
30
35
40
45
50
60
70
80
90
100
110
125
150
175
200
225
250
300
350
400
450
500
600
700
800
1000
1200
1600
2000
2500
3000
4000
5000-6000
For Fuses only
1A, 3A, 6A, 10A and 601 A
Example 16:
A hermetic motor compressor has a rated current of 16A. What is the minimum ampere
rating of the motor branch disconnecting means?
Example 17:
What is the minimum ampere rating of the disconnecting means of a hermetic motor
having 30A rated current?
Example 18:
What size overload relay is required to
protect a 3-phase, 230-V 42 A hermetic
motor?
Pec motors
[5/5]
CEERS REVIEW CENTER
EE REVIEW APRIL 2022
PEC TERMS
Doña Esperanza Village, Tisa, Cebu City
Tel. No. 261-2244
email add: ceers.reviewcenter@gmail.com
DEFINITION
D. being reached without use of a ladder
1.
Surrounded by a case, housing, fence, or walls
that prevent from accidentally contacting
energized part is
A. enclosed *
C. guarded
B. isolated
D. concealed
8.
_____ duty is a type of service where both the
load and the time intervals may have wide
variations.
A. Continuous
C. Intermitted
B. Periodic
D. Varying *
2.
_____ means that equipment is not readily
accessible to persons unless special means for
access are used.
A. Isolated *
C. Elevated
B. Guarded
D. Concealed
9.
3.
A piece of electrical equipment that is designed
to operated at alternate intervals of (1) load
and no load; or (2) load and rest; or (3) load,
no load, and rest is called _____ duty.
A. short time
C. periodic
B. intermittent *
D. varying
Continuous load is _____.
A. a load where the maximum current is
expected to continue for three hours or more *
B. a load where the maximum current is
expected to continue for one hour or more
C. intermittent operation in which the load
conditions are regularly recurrent
D. operation at a substantially constant load for
an indefinitely long time
4.
5.
An electrical outlet constructed so that moisture
will not enter the enclosure is classified as being
_____
A. waterproof
C. watertight *
B. rainproof
D. weatherproof
The _____ is the
conductor can carry
conditions of use
temperature rating.
A. load
B. demand
current in amperes a
continuously under the
without exceeding its
C. connected load
D. ampacity *
6.
_____ means so constructed or protected that
exposure to the weather will not interfere with
successful operation.
A. Weatherproof *
C. Weather-resistant
B. Weather-tight
D. Weather-sealed
7.
An accessible conductor is
A. not permanently enclosed by a structure *
B. admitting close approach
C. not guarded by locked doors, elevation or
other methods
10. An isolating which is one that is _____.
A. intended for cutting off an electrical circuit
from its source of power *
B. required to have a padlock
C. primarily used with an insulation transformer
D. used only for heavy motor overloads
11. A device actuated by the operation of some
other device with which it is directly associated,
to govern succeeding operations of the same or
allied devices.
A. relay
C. interlock *
B. controller
D. governor
BRANCH CIRCUITS
12. It is a device intended to provide protection
from the effects of arc faults by recognizing the
characteristics unique to arcing and by
functioning to de-energize the circuit when an
arc fault is detected.
A. arc fault circuit breaker
B. arc fault circuit interrupter *
C. arc fault arrester
D. arc fault de-energizer
13. For ranges of 8 ¾ kW or more rating, the
minimum branch circuit rating shall be _____
amperes.
A. 30
C. 50
B. 40 *
D. 60
20. The unit lighting load for dwelling unit,
expressed in volt-amperes per square meter
shall be
A. 16
C. 24 *
B. 28
D. 8
14. The rating of any one cord-and-plug-connected
utilization equipment not fastened in place shall
not exceed _____ percent of the branch circuit
ampere rating
A. 125
C. 100
B. 110
D. 80 *
21. At least one receptacle outlet shall be installed
directly above a show window for each _____
linear meters or major fraction thereof of show
window area measured horizontally at its
maximum width.
A. 1
C. 3 *
B. 2
D. 4
15. The total rating of utilization equipment
fastened in place, other than luminaries shall
not exceed ____ percent of the branch circuit
ampere rating where lighting units, cord-andplug-connected utilization equipment not
fastened in place or both are also supplied.
A. 50 *
C. 80
B. 75
D. 100
16. Branch circuit larger than _____ amperes shall
supply only non lighting outlet loads
A. 30
C. 50 *
B. 40
D. 60
17. Appliance receptacle outlets installed in a
dwelling unit for a specific appliances such as
laundry equipment, shall be installed within
_____ mm of the intended location of the
appliances.
A. 1000
C. 1800 *
B. 1500
D. 2000
18. In kitchens and dining areas of dwelling units,
a receptacle outlet shall be installed at each
corner space wider than _____ mm.
A. 250
C. 300 *
B. 80
D. 350
19. The demand factor for air-conditioning load is
_____%
A. 50
C. 90
B. 80
D. 100 *
22. The rating of any one cord and a plug
connected utilization equipment shall not
exceed _____ percent of the branch circuit
ampere rating.
A. 50
C. 100
B. 80 *
D. 125
23. For receptacle outlets, each single or each
multiple receptacle on one strap shall be
considered at not less than _____ voltamperes.
A. 150
C. 200
B. 180 *
D. 250
24. For hallways of _____ mm or more in length at
least one receptacle outlet shall be required.
A. 3000 *
C. 3300
B. 3200
D. 3500
25. The unit load per square meter in volt-amperes
of the following occupancies is 24, except
A. dwelling units
C. hospitals *
B. schools
D. stores
26. For over 600 volts nominal, open individual
conductors shall not be smaller than _____
mm2 copper or _____ mm2 aluminum.
A. 8, 14
C. 14, 30
B. 14, 22 *
D. 22, 30
Page 1 of 3
Engr. Genry Oñate: 09323728227/09178164901
“Learn to Solve. Solve to Learn More!”
Engr. Glenn Valenzona: 09328723377/09989712800
CEERS REVIEW CENTER
EE REVIEW APRIL 2022
PEC TERMS
Doña Esperanza Village, Tisa, Cebu City
Tel. No. 261-2244
27. Conductors on poles
not less than _____
racks or brackets.
A. 300 *
B. 250
email add: ceers.reviewcenter@gmail.com
shall have a separation of
mm where not placed on
C. 200
D. 150
28. Open conductors shall be separated from open
conductors of other circuits or systems by not
less than _____ mm.
A. 200
C. 100 *
B. 150
D. 80
29. Conductors supported on poles shall provide a
horizontal climbing space not less than _____
mm
for
power
conductors,
below
communication conductors.
A. 730
C. 780
B. 760 *
D. 800
30. Conductors shall have a vertical clearance of
not less than _____ mm from the roof surface.
A. 1800
C. 2500 *
B. 2000
D. 3000
31. The vertical clearance from the roof shall be
maintained for a distance of not less than _____
mm on all direction from the edge of the roof.
A. 500
C. 900
B. 800
D. 1000 *
32. The recommended maximum total voltage drop
on both the feeders and branch circuits is _____
percent.
A. 3.5
C. 5 *
B. 2.5
D. 6
33. The service disconnecting means for each set
of service-entrance conductors shall consist of
not more than _____ switches.
A. 6 *
C. 10
B. 8
D. 12
A.
B.
6
4
C. 8
D. 10
SERVICES
35. Services using copper conductors shall have
sufficient capacity and shall not be smaller than
A. 5.5 mm2
C. 14 mm 2
B. 8.0 mm2 D. 22 mm2
36. Conductors must have a clearance from
windows, porches, fire escapes of not less than
A. 800 mm
C. 1100 mm
B. 900 mm
D. 1000 mm
37. For services not over 600 volts nominal service
conductors shall have a vertical clearance of
_____ mm from the roof surface.
A. 2000
C. 2500 *
B. 3000
D. 2200
38. Where the voltage between conductors does
not exceed 300 volts, and the roof has a slope
of not less than 00 mm in 300 mm, a reduction
of clearance to ___mm shall be permitted
A. 2000
C. 1500
B. 2200
D. 1000 *
*
39. Service drop conductors where not in excess of
600 volts nominal, shall have a vertical
clearance
A. 2000
C. 3100 *
B. 2500
D. 3300
40. Service drop conductors where not in excess of
600 volts nominal, shall have a vertical
clearance of ____mm over public streets,
parking areas subject to traffic, and driveway
on other than residential areas.
A. 4600
C. 5000
B. 5500
*
D. 5300
34. How many times the diameter of the largest
raceways shall the length of the box be in
straight pulls?
41. A column pole or narrow base structure of
wood, steel or other material supporting
overhead conductors by means of arms or
bracket.
A. over head
C. cleat
B. mast
*
D. extension pole
42. The maximum setting the ground-fault
protection in a service disconnecting means
shall be ____ amperes.
A. 800
C. 1200 *
B. 1000
D. 2000
OVERCURRENT – PROTECTION
43. Overcurrent protection for conductors and
equipment is provided to _____ the circuit if the
current reaches a value that will cause an
excessive or dangerous temperature in
conductors or conductor insulation.
A. open
*
C. interrupt
B. close
D. blow
44. The ampacity of a device to open under short
circuit or ground fault is based on its ____
rating.
A. operating
C. ampacity
B. interrupting
* D. temperature
45. The largest standard cartridge fuse rating is
_____ amps.
A. 6000
*
C. 1000
B. 1200
D. 600
46. What is the MAXIMUM number of overcurrent
devices for a lightning and appliance that can
be installed in a single cabinet?
A. 36
C. 24
B. 42
D. 48
47. Defined as properly localizing a fault condition
to restrict outages to the equipment effected,
accomplished by choice of selective fault
protective devices.
A. Monitoring
C. Sensing
B. Coordination
*D. Fault device
48. The maximum percent of overcurrent
protection allowed is _____ of the input current
to an autotransformer when less than 9 amps.
A. 167%
*
C. 300%
B. 150%
D. 200%
49. Where the overcurrent device is rated over
_____ amperes, the ampacity of the conductors
it protects shall be equal to or greater than
rating of the overcurrent device.
A. 150
C. 500
B. 300
D. 800
*
50. Ground-fault circuit-interrupters shall be
installed in the branch circuit supplying under
water pool lighting fixtures operating at more
than _____ volts.
A. 12
C. 25
B. 15
D. 30
GROUNDING AND BONDING
51. Grounding Electrodes of pipe or conduit shall
not be smaller than _____ mm trade size and
where iron or steel shall have the outer surface
galvanized.
A. 10
C. 8
B. 20
D. 16
52. Grounding electrodes of rods end steel or iron
shall be at least ____ mm in diameter.
A. 16
*
C. 10
B. 12
D. 20
53. Rod and pipe grounding electrodes shall be
installed such that at least ____ mm in length
and in contact with the soil.
A. 1800
C. 2200
B. 2000
D. 2400
*
54. Each grounding plate electrode shall expose not
less than ____ square meter of surface to
exterior soil.
A. ¼
C. 1/3
Page 2 of 3
Engr. Genry Oñate: 09323728227/09178164901
“Learn to Solve. Solve to Learn More!”
Engr. Glenn Valenzona: 09328723377/09989712800
CEERS REVIEW CENTER
EE REVIEW APRIL 2022
PEC TERMS
Doña Esperanza Village, Tisa, Cebu City
Tel. No. 261-2244
email add: ceers.reviewcenter@gmail.com
B. 1/5
D. ½
55. _____ grounding electrode is not permitted
A. iron
C. steel
B. aluminum
D. stainless steel
56. Connection between a conductive or
metal object and an element of a
protection system to accomplish
continuity between the two.
A. interlink
C. connector
B. messenger
D. bonding
inductive
lightning
electrical
*
57. In a grounded system, what do you call the
conductor that connects the circuit grounded
conductor at the service and/or the equipment
grounding conductor to the grounding
electrode
A. main grounding conductor
B. common main grounding conductor
C. equipment grounding conductor
D. grounding electrode conductor
*
58. What conductor used to connect the grounded
circuit of a wiring system to a grounding
electrode
A. grounded conductor
B. main bonding jumper
C. bonding jumper
D. grounding conductor
59. _____ is a system or circuit conductor that is
intentionally grounded.
A. Grounding conductor
B. Neutral conductor
C. Grounded conductor *
D. Grounding electrode conduct
60. The grounded conductor of a branch circuit
shall be identified by a continuous _____ color.
A. gray
C. white
B. yellow
D. white or gray *
61. The equipment grounding conductors of a
branch circuit shall be identified by a continuous
______ color.
A. Yellow
B. Green *
C. Gray
D. White
62. According to the code the grounding conductor
shall be identified by
A. one continuous green color
B. being bare
C. a continuous green color with yellow stripes
D. any of these
63. A/an _____ shall be used to connect the
grounding terminal of a grounding type
receptacle to a grounded box.
A. feeder conductor
B. equipment bonding jumper
*
C. branch circuit
D. bonding jumper main
64. Which of the following shall be provided where
necessary to ensure electrical continuity?
A. Grounding
C. Jumpers
B. Bonding
D. connectors
65. According to the Code, metal enclosures for
grounding electrode conductors shall be _____.
A. not permitted
B. rigid conduit
C. electrically continuous
D. permitted
PROTECTION AGAINST LIGHTNING
66. A device capable to drawing lightning discharge
to it in preference to vulnerable parts of the
protected area.
A. rods
C. air terminal
B. points
D. ground terminal
67. A conductor encircling a building and
interconnecting all ground terminals
A. counterpoise
C. ground terminals
B. bonding
D. ground fittings
68. The average distance between down
conductors used for lightning protection shall
not exceed _____ meters.
A. 15
C. 25
B. 20
D. 30
75. Type MI (mineral insulated) cable shall be
securely supported at intervals not exceeding
___ mm
A. 1500
C. 2000
B. 1800 *
D. 2200
69. Protection of structures containing flammable
liquid and gasses may be achieved to a
considerable degree by the use of
A. air terminals
B. overhead ground wires
C. masts
D. any of these
76. Type NM (non metallic) or NMC cable supports
shall be secured in place at intervals of ___ mm.
A. 1500
C. 1000
B. 1300 *
D. 800
MISCELLANEOUS
77. Intermediate metal conduit shall be supported
at least every ___ mm
A. 2000
C. 2700
B. 2400
D. 3000
70. Which of the following has the highest electrical
breakdown strength and longest life compared
to other insulating materials?
A. mica
C. rubber
B. impregnated paper D. thermoplastic
78. Intermediate metal conduit or RMC or FMC
smaller than ___ mm electrical trade size shall
not be used
A. 15
C. 25
B. 20
D. 32
71. To cut a rigid conduit, use a _____
A. 3-wheel pipe cutter
B. hack saw and ream the ends
*
C. chisel and ream the ends
D. band saw
79. Rigid metal conduit shall be firmly fastened
within ___ mm of each outlet box, junction box,
cabinet or fitting
A. 500
C. 900
*
B. 700
D. 1000
72. When do you use a tap tool?
A. connecting wires
B. cutting internal threads *
C. reaming raceways
D. cutting external threads
80. Flexible metal conduit shall be secured by an
approved means at intervals not exceeding ___
mm.
A. 1200
C. 1400
B. 1300
D. 1500
73. The ampacity of conductors in armored cable
installed in thermal installation shall be that of
___ 0C conductors.
A. 60
C. 85
B. 75
D. 90
81. Each length of HDPE shall be clearly and
durably marked at least every _____ mm.
A. 2000
C. 2800
B. 2400
D. 3000
74. Type MC (metal clad) cable shall be supported
and secured at interval not exceeding ___ mm.
A. 1800 *
C. 2200
B. 2000
D. 2500
82. Wireway shall be supported at intervals not to
exceed ___mm
A. 1200
C. 1800
B. 1500
*
D. 2000
Page 3 of 3
Engr. Genry Oñate: 09323728227/09178164901
“Learn to Solve. Solve to Learn More!”
Engr. Glenn Valenzona: 09328723377/09989712800