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Method of Computation

The document provides details on the design analyses and method of computation for branch circuit panels at the Taganito HPAL Project site in Taganito, Surigao del Norte, Philippines. It includes calculations for full load current, circuit breaker rating, cable size and ampacity, voltage drop, ground wire size, and conduit sizing for branch circuits on the second floor of Building 1, third floor of Building 1, ground floor of Building 2, and second floor of Building 2. The purpose is to determine the proper electrical equipment and components to use for the branch circuit panels based on National Electrical Code standards.

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Patricia Ann Pedraza
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© © All Rights Reserved
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128 views10 pages

Method of Computation

The document provides details on the design analyses and method of computation for branch circuit panels at the Taganito HPAL Project site in Taganito, Surigao del Norte, Philippines. It includes calculations for full load current, circuit breaker rating, cable size and ampacity, voltage drop, ground wire size, and conduit sizing for branch circuits on the second floor of Building 1, third floor of Building 1, ground floor of Building 2, and second floor of Building 2. The purpose is to determine the proper electrical equipment and components to use for the branch circuit panels based on National Electrical Code standards.

Uploaded by

Patricia Ann Pedraza
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLS, PDF, TXT or read online on Scribd
You are on page 1/ 10

TAGANITO HPAL PROJECT

TAGANITO, SURIGAO DEL NORTE

DESIGN ANALYSES/ METHOD OF COMPUTATION


I.BRANCH CIRCUIT COMPUTATION SECOND FLOOR PANEL(BUILDING 1)
PANELBOARD-SECOND FLOOR (BUILDING 1)
A. BRANCH CIRCUIT No. 1
Capacity = 48.10 kVA
Voltage = 230 V
Phase = 3Ph, 2W
P. F. = 1.00
Capacity (KVA) = 48.10 kVA

FULL LOAD CURRENT:


= 48.10 kVA X 1000
$ 1.732 X 230 V
FLC = 120.75 A

CB RATING: = 120.75 X 1.25 = 150.93 A


Article 2.10 .2.3 (A) Overcurrent Protection PEC 1 2017 page 44
USE: 175 AT 3P
100 AF MCCB
CABLE SIZE AMPACITY:

120.75 X 1.25 = 150.9 A


Article 2.10 .2.2 (A)(1)(a) Conductor setting PEC 1 2017 page 43
1 SET/S 3 60.0 mm² THHN

VOLTAGE DROP CALCULATION:


* Allowable Voltage Drop for Branch Circuit say 1%

VD = 30.8 X 120.75 X 100 LM


= 4.89 Volts
1000 X 38.0 X 2 SET/S
%VD = 4.89 Volts
230 Volts
%VD = 2.13 ≤ 1 %
USE: 2 SET/S 3 38.0 mm² THHN

FOR BRANCH CIRCUIT NO 1 :


USE: 2 SET/S 3 38.0 mm² THHN

FOR GROUND WIRE:


Article 2.50. Table 2.50.6.13 Minimum Size Equipment Grounding Conductors for Grounding Raceway and Equipment
PEC 1 2017 page 124
USE: 2 14.0 mm² Copper Wire

FOR CONDUIT SIZING:


Article 3.0 Table 3.0.1.1© Metric Designator and Trade Size
USE: 1- 53.0 mmØ IMC
TAGANITO HPAL PROJECT
TAGANITO, SURIGAO DEL NORTE

DESIGN ANALYSES/ METHOD OF COMPUTATION


I.BRANCH CIRCUIT COMPUTATION THIRD FLOOR PANEL(BUILDING 1)
PANELBOARD-THIRD FLOOR (BUILDING 1)
A. BRANCH CIRCUIT No. 2
Capacity = 48.10 kVA
Voltage = 230 V
Phase = 3Ph, 2W
P. F. = 1.00
Capacity (KVA) = 48.10 kVA

FULL LOAD CURRENT:


= 48.10 kVA X 1000
$ 1.732 X 230 V
FLC = 120.75 A

CB RATING: = 120.75 X 1.25 = 150.93 A


Article 2.10 .2.3 (A) Overcurrent Protection PEC 1 2017 page 44
USE: 175 AT 3P
100 AF MCCB
CABLE SIZE AMPACITY:

Article 2.10 .2.2 (A)(1)(a) Conductor setting PEC 1 2017 page 43


1 SET/S 3 60.0 mm² THHN

VOLTAGE DROP CALCULATION:


* Allowable Voltage Drop for Branch Circuit say 1%

VD = 30.8 X 120.75 X 100 LM


= 4.89 Volts
1000 X 38.0 X 2 SET/S
%VD = 4.89 Volts
230 Volts
%VD = 2.13 ≤ 1 %
USE: 2 SET/S 3 38.0 mm² THHN

FOR BRANCH CIRCUIT NO 2 :


USE: 2 SET/S 3 38.0 mm² THHN

FOR GROUND WIRE:


Article 2.50. Table 2.50.6.13 Minimum Size Equipment Grounding Conductors for Grounding Raceway and Equipment
PEC 1 2017 page 124
USE: 2 14.0 mm² Copper Wire
FOR CONDUIT SIZING:
Article 3.0 Table 3.0.1.1© Metric Designator and Trade Size
USE: 1- 53.0 mmØ IMC
TAGANITO HPAL PROJECT
TAGANITO, SURIGAO DEL NORTE

DESIGN ANALYSES/ METHOD OF COMPUTATION


I.BRANCH CIRCUIT COMPUTATION GROUND FLOOR PANEL(BUILDING 2)
PANELBOARD-GROUND FLOOR (BUILDING 2)
A. BRANCH CIRCUIT No. 1
Capacity = 19.24 kVA
Voltage = 230 V
Phase = 3Ph, 2W
P. F. = 1.00
Capacity (KVA) = 19.24 kVA

FULL LOAD CURRENT:


= 19.24 kVA X 1000
$ 1.732 X 230 V
FLC = 48.30 A

CB RATING: = 48.30 X 1.25 = 60.37 A


Article 2.10 .2.3 (A) Overcurrent Protection PEC 1 2017 page 44
USE: 85 AT 3P
100 AF MCCB
CABLE SIZE AMPACITY:

48.30 X 1.25 = 60.4 A


Article 2.10 .2.2 (A)(1)(a) Conductor setting PEC 1 2017 page 43
1 SET/S 3 22.0 mm² THHN

VOLTAGE DROP CALCULATION:


* Allowable Voltage Drop for Branch Circuit say 1%

VD = 30.8 X 48.30 X 100 LM


= 1.96 Volts
1000 X 38.0 X 2 SET/S
%VD = 1.96 Volts
230 Volts
%VD = 0.85 ≤ 1 %
USE: 2 SET/S 3 38.0 mm² THHN

FOR BRANCH CIRCUIT NO 1 :


USE: 2 SET/S 3 38.0 mm² THHN

FOR GROUND WIRE:


Article 2.50. Table 2.50.6.13 Minimum Size Equipment Grounding Conductors for Grounding Raceway and Equipment
PEC 1 2017 page 124
USE: 2 8.0 mm² Copper Wire

FOR CONDUIT SIZING:


Article 3.0 Table 3.0.1.1© Metric Designator and Trade Size
USE: 1- 53.0 mmØ IMC
TAGANITO HPAL PROJECT
TAGANITO, SURIGAO DEL NORTE

DESIGN ANALYSES/ METHOD OF COMPUTATION


I.BRANCH CIRCUIT COMPUTATION SECOND FLOOR PANEL(BUILDING 2)
PANELBOARD-SECOND FLOOR (BUILDING 2)
A. BRANCH CIRCUIT No. 2
Capacity = 20.68 kVA
Voltage = 230 V
Phase = 3Ph, 2W
P. F. = 1.00
Capacity (KVA) = 20.68 kVA

FULL LOAD CURRENT:


= 20.68 kVA X 1000
$ 1.732 X 230 V
FLC = 51.91 A

CB RATING: = 51.91 X 1.25 = 64.89 A


Article 2.10 .2.3 (A) Overcurrent Protection PEC 1 2017 page 44
USE: 85 AT 3P
100 AF MCCB
CABLE SIZE AMPACITY:

51.91 X 1.25 = 64.9 A


Article 2.10 .2.2 (A)(1)(a) Conductor setting PEC 1 2017 page 43
1 SET/S 3 22.0 mm² THHN

VOLTAGE DROP CALCULATION:


* Allowable Voltage Drop for Branch Circuit say 1%

VD = 30.8 X 51.91 X 100 LM


= 2.10 Volts
1000 X 38.0 X 2 SET/S
%VD = 2.10 Volts
230 Volts
%VD = 0.91 ≤ 1 %
USE: 2 SET/S 3 38.0 mm² THHN

FOR BRANCH CIRCUIT NO 2 :


USE: 2 SET/S 3 38.0 mm² THHN

FOR GROUND WIRE:


Article 2.50. Table 2.50.6.13 Minimum Size Equipment Grounding Conductors for Grounding Raceway and Equipment
PEC 1 2017 page 124
USE: 2 8.0 mm² Copper Wire

FOR CONDUIT SIZING:


Article 3.0 Table 3.0.1.1© Metric Designator and Trade Size
USE: 1- 53.0 mmØ IMC
TAGANITO HPAL PROJECT
TAGANITO, SURIGAO DEL NORTE

DESIGN ANALYSES/ METHOD OF COMPUTATION


I.BRANCH CIRCUIT COMPUTATION THIRD FLOOR PANEL(BUILDING 2)
PANELBOARD-THIRD FLOOR (BUILDING 2)
A. BRANCH CIRCUIT No. 3
Capacity = 20.68 kVA
Voltage = 230 V
Phase = 3Ph, 2W
P. F. = 1.00
Capacity (KVA) = 20.68 kVA

FULL LOAD CURRENT:


= 20.68 kVA X 1000
$ 1.732 X 230 V

FLC = 51.91 A

CB RATING: = 51.91 X 1.25 = 64.89 A


Article 2.10 .2.3 (A) Overcurrent Protection PEC 1 2017 page 44
USE: 85 AT 3P
100 AF MCCB
CABLE SIZE AMPACITY:

51.91 X 1.25 = 64.9 A


Article 2.10 .2.2 (A)(1)(a) Conductor setting PEC 1 2017 page 43
1 SET/S 3 22.0 mm² THHN

VOLTAGE DROP CALCULATION:


* Allowable Voltage Drop for Branch Circuit say 1%

VD = 30.8 X 51.91 X 100 LM


= 2.10 Volts
1000 X 38.0 X 2 SET/S
%VD = 2.10 Volts
230 Volts
%VD = 0.91 ≤ 1 %
USE: 2 SET/S 3 38.0 mm² THHN

FOR BRANCH CIRCUIT NO 3 :


USE: 2 SET/S 3 38.0 mm² THHN

FOR GROUND WIRE:


Article 2.50. Table 2.50.6.13 Minimum Size Equipment Grounding Conductors for Grounding Raceway and Equipment
PEC 1 2017 page 124
USE: 2 8.0 mm² Copper Wire

FOR CONDUIT SIZING:


Article 3.0 Table 3.0.1.1© Metric Designator and Trade Size
USE: 1- 53.0 mmØ IMC
TAGANITO HPAL PROJECT
TAGANITO, SURIGAO DEL NORTE

I2 BRANCH CIRCUIT COMPUTATION


LIGHTING PANELBOARD-SECOND FLOOR (BUILDING 1)
B. Circuit No. 1 - Lighting
Capacity = 3.39 kVA
Voltage = 230 V
Phase = 1Ph, 2W
P. F. = 1.00
Capacity (KVA) = 3.39 kVA

FULL LOAD CURRENT:


= 3.39 kVA X 1000
$ 1 X 230 V
FLC = 14.74 A

CB RATING: = 14.74 X 1.25 = 18.42 A


Article 2.10 .2.3 (A) Overcurrent Protection PEC 1 2017 page 44
USE: 20 AT 1P
30 AF MCCB
CABLE SIZE AMPACITY:

14.74 X 1.25 = 18.4 A


Article 2.10 .2.2 (A)(1)(a) Conductor setting PEC 1 2017 page 43
1 SET/S 2 3.5 mm² THHN

VOLTAGE DROP CALCULATION:


* Allowable Voltage Drop for Branch Circuit say 3%

VD = 35.6 X 14.74 X 61 LM
= 9.14 Volts
1000 X 3.5 X 1 SET/S
%VD = 9.14 Volts
230 Volts
%VD = 3.98 ≤ 3 %
USE: 1 SET/S 2 3.5 mm² THHN

FOR BRANCH CIRCUIT NO 2 :


USE: 1 SET/S 2- 3.5 mm² THHN

FOR GROUND WIRE:


Article 2.50. Table 2.50.6.13 Minimum Size Equipment Grounding Conductors for Grounding Raceway and Equipment
PEC 1 2017 page 124

USE: 1- 3.5 mm² Copper Wire


FOR CONDUIT SIZING:
Article 3.0 Table 3.0.1.1© Metric Designator and Trade Size
USE: 1- 16.0 mmØ IMC
TAGANITO HPAL PROJECT
TAGANITO, SURIGAO DEL NORTE

I2 BRANCH CIRCUIT COMPUTATION


LIGHTING PANELBOARD THIRD FLOOR (BUILDING 1)
B. Circuit No. 2 - Lighting
Capacity = 3.30 kVA
Voltage = 230 V
Phase = 1Ph, 2W
P. F. = 1.00
Capacity (KVA) = 3.30 kVA

FULL LOAD CURRENT:


= 3.30 kVA X 1000
$ 1 X 230 V
FLC = 14.35 A

CB RATING: = 14.35 X 1.25 = 17.93 A


Article 2.10 .2.3 (A) Overcurrent Protection PEC 1 2017 page 44
USE: 20 AT 1P
30 AF MCCB
CABLE SIZE AMPACITY:

14.35 X 1.25 = 17.9 A


Article 2.10 .2.2 (A)(1)(a) Conductor setting PEC 1 2017 page 43
1 SET/S 2 3.5 mm² THHN

VOLTAGE DROP CALCULATION:


* Allowable Voltage Drop for Branch Circuit say 3%

VD = 35.6 X 14.35 X 61 LM
= 8.90 Volts
1000 X 3.5 X 1 SET/S
%VD = 8.90 Volts
230 Volts
%VD = 3.87 ≤ 3 %
USE: 1 SET/S 2 3.5 mm² THHN

FOR BRANCH CIRCUIT NO 2 :


USE: 1 SET/S 2- 3.5 mm² THHN

FOR GROUND WIRE:


Article 2.50. Table 2.50.6.13 Minimum Size Equipment Grounding Conductors for Grounding Raceway and Equipment
PEC 1 2017 page 124

USE: 1- 3.5 mm² Copper Wire


FOR CONDUIT SIZING:
Article 3.0 Table 3.0.1.1© Metric Designator and Trade Size
USE: 1- 16.0 mmØ IMC
TAGANITO HPAL PROJECT
TAGANITO, SURIGAO DEL NORTE

I2 BRANCH CIRCUIT COMPUTATION


LIGHTING PANELBOARD GROUND FLOOR (BUILDING 2)
B. Circuit No. 1 - Lighting
Capacity = 1.62 kVA
Voltage = 230 V
Phase = 1Ph, 2W
P. F. = 1.00
Capacity (KVA) = 1.62 kVA

FULL LOAD CURRENT:


= 1.62 kVA X 1000
$ 1 X 230 V
FLC = 7.04 A

CB RATING: = 7.04 X 1.25 = 8.80 A


Article 2.10 .2.3 (A) Overcurrent Protection PEC 1 2017 page 44
USE: 15 AT 1P
30 AF MCCB
CABLE SIZE AMPACITY:

7.04 X 1.25 = 8.8 A


Article 2.10 .2.2 (A)(1)(a) Conductor setting PEC 1 2017 page 43
1 SET/S 2 3.5 mm² THHN

VOLTAGE DROP CALCULATION:


* Allowable Voltage Drop for Branch Circuit say 3%

VD = 35.6 X 7.04 X 61 LM
= 4.37 Volts
1000 X 3.5 X 1 SET/S
%VD = 4.37 Volts
230 Volts
%VD = 1.90 ≤ 3 %
USE: 1 SET/S 2 3.5 mm² THHN

FOR BRANCH CIRCUIT NO. 1 :


USE: 1 SET/S 2- 3.5 mm² THHN

FOR GROUND WIRE:


Article 2.50. Table 2.50.6.13 Minimum Size Equipment Grounding Conductors for Grounding Raceway and Equipment
PEC 1 2017 page 124

USE: 1- 2.0 mm² Copper Wire


FOR CONDUIT SIZING:
Article 3.0 Table 3.0.1.1© Metric Designator and Trade Size
USE: 1- 16.0 mmØ IMC
TAGANITO HPAL PROJECT
TAGANITO, SURIGAO DEL NORTE

I2 BRANCH CIRCUIT COMPUTATION


LIGHTING PANELBOARD SECOND FLOOR (BUILDING 2)
B. Circuit No. 2 - Lighting
Capacity = 1.68 kVA
Voltage = 230 V
Phase = 1Ph, 2W
P. F. = 1.00
Capacity (KVA) = 1.68 kVA

FULL LOAD CURRENT:


= 1.68 kVA X 1000
$ 1 X 230 V
FLC = 7.30 A

CB RATING: = 7.30 X 1.25 = 9.13 A


Article 2.10 .2.3 (A) Overcurrent Protection PEC 1 2017 page 44
USE: 15 AT 1P
30 AF MCCB
CABLE SIZE AMPACITY:

7.30 X 1.25 = 9.1 A


Article 2.10 .2.2 (A)(1)(a) Conductor setting PEC 1 2017 page 43
1 SET/S 2 3.5 mm² THHN

VOLTAGE DROP CALCULATION:


* Allowable Voltage Drop for Branch Circuit say 3%

VD = 35.6 X 7.30 X 61 LM
= 4.53 Volts
1000 X 3.5 X 1 SET/S
%VD = 4.53 Volts
230 Volts
%VD = 1.97 ≤ 3 %
USE: 1 SET/S 2 3.5 mm² THHN

FOR BRANCH CIRCUIT NO 2 :


USE: 1 SET/S 2- 3.5 mm² THHN

FOR GROUND WIRE:


Article 2.50. Table 2.50.6.13 Minimum Size Equipment Grounding Conductors for Grounding Raceway and Equipment
PEC 1 2017 page 124

USE: 1- 2.0 mm² Copper Wire


FOR CONDUIT SIZING:
Article 3.0 Table 3.0.1.1© Metric Designator and Trade Size
USE: 1- 16.0 mmØ IMC
TAGANITO HPAL PROJECT
TAGANITO, SURIGAO DEL NORTE

I2 BRANCH CIRCUIT COMPUTATION


LIGHTING PANELBOARD THIRD FLOOR (BUILDING 2)
B. Circuit No. 3 - Lighting
Capacity = 1.44 kVA
Voltage = 230 V
Phase = 1Ph, 2W
P. F. = 1.00
Capacity (KVA) = 1.44 kVA

FULL LOAD CURRENT:


= 1.44 kVA X 1000
$ 1 X 230 V
FLC = 6.26 A

CB RATING: = 6.26 X 1.25 = 7.83 A


Article 2.10 .2.3 (A) Overcurrent Protection PEC 1 2017 page 44
USE: 15 AT 1P
30 AF MCCB
CABLE SIZE AMPACITY:

6.26 X 1.25 = 7.8 A


Article 2.10 .2.2 (A)(1)(a) Conductor setting PEC 1 2017 page 43
1 SET/S 2 3.5 mm² THHN

VOLTAGE DROP CALCULATION:


* Allowable Voltage Drop for Branch Circuit say 3%

VD = 35.6 X 6.26 X 61 LM
= 3.88 Volts
1000 X 3.5 X 1 SET/S
%VD = 3.88 Volts
230 Volts
%VD = 1.69 ≤ 3 %
USE: 1 SET/S 2 3.5 mm² THHN

FOR BRANCH CIRCUIT NO 3 :


USE: 1 SET/S 2- 3.5 mm² THHN

FOR GROUND WIRE:


Article 2.50. Table 2.50.6.13 Minimum Size Equipment Grounding Conductors for Grounding Raceway and Equipment
PEC 1 2017 page 124

USE: 1- 2.0 mm² Copper Wire


FOR CONDUIT SIZING:
Article 3.0 Table 3.0.1.1© Metric Designator and Trade Size
USE: 1- 16.0 mmØ IMC

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