How to Get the ampacity using the PEC table

1. Ampacity of
Conductors

2. Ampacity- Is the maximum current that a
conductor can carry continuously under the
condition of use without exceeding its
temperature rating
Ampere or amps - Is the unit of electric
current
Philippine Electrical Code- Is the
practical safeguarding of persons and
property from hazard arising from the
use of electricity

4. AMPACITY CORRECTION FACTOR

5. Problem 1: What is the ampacity of
5.5mm² copper wire, type THW?
Problem 2: What is the ampacity of
#12 AWG aluminum wire, type
RHW?

6. Problem 3: What is the ampacity of
6 AWG aluminum wire, type THHN?
Problem 4: What is the ampacity of
#12 AWG aluminum wire, type ZW?

7. Problem 5: Given
Type of wire = THHN, 90 ⁰C
Ampacity = 90 Ampere
Size of wire = ?
Problem 6: Given
Type of wire = TW, 60 ⁰C
Ampacity = 40 Ampere
Size of wire = ?

8. Find the maximum ampacity
of a 22 mm2 copper
conductor with Type THWN
insulation used in an area
with an ambient
temperature of 43⁰C

9. a. Determine the ampacity of a 22 mm2 copper conductor
with Type THWN insulation from the wire table
b. Follow the second column down to the correction factor
chart. Locate 43⁰C in the far left-hand column of the
correction factor chart; 43⁰C falls between 41⁰C and 45⁰C
c. The ampacity of the conductor in the above wire table is
to be multiplied by the correction factor

11. a. Determine the ampacity of a 22 mm2 copper conductor
with Type THWN insulation from the wire table
b. Follow the second column down to the correction factor
chart. Locate 43⁰C in the far left-hand column of the
correction factor chart; 43⁰C falls between 41⁰C and 45⁰C
c. The ampacity of the conductor in the above wire table is
to be multiplied by the correction factor
85

12. AMPACITY CORRECTION FACTOR

13. a. Determine the ampacity of a 22 mm2 copper conductor
with Type THWN insulation from the wire table
b. Follow the second column down to the correction factor
chart. Locate 43⁰C in the far left-hand column of the
correction factor chart; 43⁰C falls between 41⁰C and 45⁰C
c. The ampacity of the conductor in the above wire table is
to be multiplied by the correction factor
85
0.82
85 x 0.82= 69.7 A

14. TRY THIS!
1. What is the ampacity of 38mm² copper
wire, type THW?______________
2. What is the ampacity of #10 AWG aluminum
wire, type THHN?______________
3. What is the ampacity of 100mm² copper
wire, type THWN?_____________
4. What is the size of wire for THWN 75 ⁰C, 65
Ampere?______________
5. What is the size of wire for THHN 90 ⁰C, 130
Ampere?__________________

15. 1.What is the ampacity
of #8 AWG, TW wire?
a. 20 A
b. 30 A
c. 40 A
d. 45 A

16. 2. What is the size of a TW
copper wire with 20Ampere
ampacity?
a.2.0mm²
b.b. 3.5mm²
c.c. 5.5mm²
d.d. 8.0mm²

17. 3. What is the standard size of
wire usually used in service
entrance for single family
dwelling?
a. 2.0mm²
b. 3.5mm²
c. 5.5mm²
d. 8.0mm²

18. 4. These are use in an interior house
wiring at circuit voltage up to 600 Volts.
Suitable for the type of service where
the conductor temperature does not
exceed 75˚C in dry or wet location.
a.Moisture Resistant Thermoplastic Wire
(type THW).
b. Thermoplastic wire (type TW)
c. Control cable (braided type)
d. Flat Cord (type SPT)

19. 5. This has 2 to 4 stranded
conductors used for portable cords
in electrical equipment.
a. Thermoplastic Fixture Wire (type
TF).
b. Royal cord
c. Thermoplastic Fixture with Nylon
Wire (type TFN).
d. Flat Cord (type SPT)

20. 6. This can be solid or stranded
used for wiring lighting fixtures and
as terminal wires.
a. Thermoplastic Fixture Wire (type
TF).
b. Royal cord
c. Thermoplastic Fixture with Nylon
Wire (type TFN).
d. Flat Cord (type SPT)

21. 7. It is flame retardant and
resistant to heat, gas, and oil.
a. Thermoplastic Fixture Wire (type
TF).
b. Royal cord
c. Thermoplastic Fixture with
Nylon Wire (type TFN).
d. Flat Cord (type SPT)

22. 8. This wire cannot be
used in wet locations.
a.TW
b. THW
c. THHN
d. THWN

23. 9. This is the maximum
operating temperature of a
THHN wire.
a. 60°C
b. 75°C
c. 85°C
d. 90°C

24. 10. This is an ordinary wire use in an
interior house wiring at circuit voltage up to
600 Volts. This is suitable for the type of
service where the conductor temperature
does not exceed 60˚C in dry or wet location.
a. Moisture Resistant Thermoplastic Wire
(type THW).
b. Thermoplastic wire (type TW)
c. Control cable (braided type)
d. Flat Cord (type SPT

25. 11. What is the standard size
of wire used in lighting
circuit?
a. #14AWG
b. #12AWG
c. #10AWG
d. #8AWG

26. 12. The standard size of wire
for air-conditioning unit is
___________.
a. #14AWG
b. #12AWG
c. #10AWG
d. #8AWG

27. 13.This consists of two conductors and
a ground used for wiring air-
conditioning unit.
a. Copper or aluminum conductor
b. Non-metallic sheathed cable (type
NM)
c. Thermoplastic covered fixture wire
(type TF)
d. Air Conditioning Unit Safety Cord
(type SPT).

28. 14.What is the equivalent
diameter size of number 10
AWG wire in millimeter
(mm)?
a. 2.05mm
b. 2.59mm
c. 3.26mm
d. 3.11mm

29. 15.What is the equivalent
diameter size of number 8
AWG wire in millimeter
(mm)?
a. 2.05mm
b. 2.59mm
c. 3.26mm
d. 3.11mm