Fundamental Design Calculations - Electrical

FUNDAMENTAL ELECTRICAL SYSTEM DESIGN DESIGN CALCULA CAL CULATION TIONS S AND A ND SYSTE SYSTEM M ARCHITECT A RCHITECTURES URES for Commercial and Residential Buildings

MAKATI DEVELOPMENT CORPORATION GF, Bonifacio Technology Center st nd 31 Street cor. 2 Avenue, Bonifacio Global City Taguig 1634, Metro Manila, Philippines Tel Nos. (02) 717-5500 to 30 www.mdc.com.ph

STANDARD Fundamental Design Calculations Electrical System Rev 00 – November 2011

CONTENTS I.

Design Criteria for Main Equipment Sizing

II.

Low Voltage Wires and Cables

III.

Busduct Sizing

IV.

Overcurrent Protection

V.

Reserved

VI.

Lighting & Power Circuits

VII.

Motor Circuits

VIII.

Fire Pump Motor Circuit

IX.

Power Factor Correction

X.

Basic Panelboard Design

XI.

Standard Electrical System Architecture A. Malls B. BPO C. High Rise Residential

XII.

Reserved

XIII.

Reserved

XIV.

References



I.

Sizing of Main Equipment A. Gener al Considerat ions The main equipments for the building’s electrical system are the transformers and generator sets. The sizes of these equipments are determined during the schematic design stage, which depend on load estimate calculation. The load estimate is derived from load densities defined for areas in each type of the building to be designed, which depends on the nature of the building and its corresponding electrical requirement. 1.

Transformers Main transformer is sized based from load estimation after the application of demand factor defined by the designing electrical engineer.

2.

Generator Sets Generator(s), on the other hand, is/are sized depending on building requirement; that is, same size as the main transformer(s) if the building is intended to have 100% backup power. Also, generator sets are sized based on ‘standby’ rating.

Below are the common load groups that are considered in load estimation – 1. 2. 3. 4. 5. 6. 7. 8. 9.

Lighting – Interior, exterior, normal, emergency. Small Power Loads – Receptacle outlets, appliances. Air-conditioning – Chillers, AHU’s, Fans, etc. Plumbing and Sanitation – Domestic pumps, booster pumps, transfer pumps, sump pump, water heaters. Fire protection – Fire pumps, FDAS. Transportation – Elevators, Escalators. Food preparation – Cooking, refrigerating, dishwashing, ovens, etc. Special Loads – Loads in theaters, etc Miscellaneous loads – Auxiliary systems, etc

This design calculation standard will only address the following types of building – 1. 2. 3. 4.

Residential Buildings Malls BPOs Hotels

B. System Voltage Consideration The utilization voltage considered in this design calculation standard is 3-phase, four wire, 400V / 230 V, 60 Hz. Three phase loads shall be served at 400V, while single phase loads shall be served at 230V line-to-neutral. Primary voltage shall be based from available power utility supply.



C. Prescriptive Design Parameters The load densities to be used in load estimation and initial main equipment sizing will be based from the parameters defined below. These parameters were derived from historical design parameters, code requirements, and actual building performance of existing Ayala buildings. However, the external designer is given liberty to review and adjust these parameters based from his experience. 1. Residential Build ings The load considerations for residential buildings in terms of power are typically the same – household loads and admin/common area loads. Residential (ACCU) Res Units Office Core Areas (Non-AC) Non - food Food Parking

Split-type ACU kw / tr tr / sqm 1.3 0.05 1.3 0.06 n/a n/a 1.3 0.06 1.3 0.10 n/a n/a

pf 0.8 0.8 n/a 0.8 0.8 n/a

A/C VA / sqm 81 90 0 90 163 0

Lighting VA / sqm 24 28 4 24 16 4

Receptacle VA / sqm 8 30 4 8 8 4

Misc VA / sqm 37 0 4 0 18 0

Total VA / sqm 150 148 12 122 205 8

2. Malls Load density considerations for malls are – Retail loads (Food and Non-food), and common area / admin loads.

Malls (Chillers) Retail Shop (non-food) Food Banks / Offices Common Areas Parking

Centralized ACU kw / tr tr / sqm 1.26 0.06 1.26 0.10 1.26 0.06 1.26 0.05 n/a n/a

pf 0.8 0.8 0.8 0.8 n/a

A/C VA / sqm 88 158 88 79 0

Lighting VA / sqm 24 16 28 4 4

Receptacle VA / sqm 8 8 30 4 4

Misc VA / sqm 0 18 0 4 0

Total VA / sqm 120 200 146 91 8

For developments having a District Cooling System, the chiller loads are not included in the building load estimation.

Malls (DCS) Retail Shop (non-food) Food Banks / Offices Common Areas Parking

Centralized ACU kw / tr 0.56 0.56 0.56 0.56 n/a

tr / sqm 0.06 0.10 0.06 0.05 n/a

pf 0.8 0.8 0.8 0.8 n/a

A/C VA / sqm 39 70 39 35 0

Lighting VA / sqm 24 16 28 4 4

Receptacle VA / sqm 8 8 30 4 4

Misc VA / sqm 0 18 0 4 0

Total VA / sqm 71 112 97 47 8



3. BPO Building s Design considerations for BPOs are different f rom typical office buildings. The occupant density is higher for BPOs resulting from higher cooling and power requirement. However, the design for BPO is often just ‘core-and-shell’, since detailed design for tenant spaces are handled by tenants. Therefore, power allotment for tenant units should be carefully considered to anticipate tenant power requirement. Centralized ACU kw / tr tr / sqm pf 1.26 0.05 0.8 1.26 0.10 0.8 n/a n/a n/a

BPO (Chillers) Core Areas BPO Offices Parking

A/C VA / sqm 79 158 0

Lighting VA / sqm 4 28 4

Receptacle VA / sqm 4 60 4

Misc VA / sqm 4 0 0

Total VA / sqm 91 246 8

For developments having a District Cooling System, the chiller loads are not included in load estimation. BPO (DCS) Core Areas BPO Offices Parking

Centralized ACU kw / tr tr / sqm pf 0.56 0.05 0.8 0.56 0.10 0.8 n/a n/a n/a

A/C VA / sqm 35 70 0



Misc VA / sqm 4 0 0


Centralized ACU kw / tr tr / sqm pf 1.26 0.05 0.8 1.26 0.05 0.8 n/a n/a n/a

A/C VA / sqm 79 79 0



Misc VA / sqm 4 8 0


4. Hotels

Hotel Units Core Areas Hotel Units Parking

D. Minimum Demand Factors 1. Residential Build ings a. Residential Loads = Connected Load x 23% (for 62 units or more) b. Admin / Common Area Loads = Connected Load x 70% 2. Malls a. Retail Loads = Connected Load x 70% b. Admin / Common Area Loads = Connected Load x 70% 3. BPO Building s a. Tenant Areas = Connected Load x 80% b. Common Areas / Admin = Connected Load x 70% 4. Hotels a. Hotel Unit Areas = Connected Load x 60% b. Common Areas / Admin = Connected Load x 70% MAKATI DEVELOPMENT CORPORATION GF, Bonifacio Technology Center st nd 31 Street cor. 2 Avenue, Bonifacio Global City Taguig 1634, Metro Manila, Philippines Tel Nos. (02) 717-5500 to 30 www.mdc.com.ph


II.

Low Voltage Wires and Cables A. Sizing of wires and cables shall be based from the f ollowing considerations: 1. Wire/cable sizing should be rated maximum of– a. 100% for non-continuous (cyclic) loads. b. 80% for continuous loads (loads that operate for 3hrs or more). 2. Wire/cable shall be sized to meet Code defined voltage drop limits at its design load current. a. Voltage Drop Considerations Where: VD = Voltage Drop NV = Nominal Voltage at Source I = 1.15* FLC for running condition or I = LRC for starting condition R = DC resistance ohm/305m L = Feeder wire length

3.

Selected wire/cable temperature rating shall be coordinated with all temperature limits, particularly at its te rminations. a. Select 60 ˚C temperature rating up to 100A b. Select 75 ˚C temperature rating for more than 100A 4. Wire/cable short circuit withstand current and time shall be coordinated with that of its upstream circuit breakers. B. STANDARD ELECTRICAL WIRING SCHEDULE (Not applicable for motors) Table VII.1 Standard Wiring Schedule for Low Voltage Systems ELECTRICAL WIRING SCHEDULE WIRE SIZE

WIRE CODE

AMPACITY

OCPD

GROUND WIRE

CONDUIT IMC/PVC

3Ø 3W+G

3Ø 4W+G

1Ø 2W+G

mm2

THWN

THHN

AT

mm2

mm Φ

in Φ

T0

Y0

S0

3.5

25

30

20AT

3.5

15

1/2

T1

Y1

S1

5.5

35

40

30AT

3.5

20

3/4

T2

Y2

S2

8

50

55

40AT

5.5

25

1

T3

Y3

S3

14

65

70

50AT

8

25

1

T4

Y4

S4

22

85

90

70AT

8

32

1 1/2

T5

Y5

S5

30

110

115

100AT

8

32

1 1/2

T7

Y6

S7

50

145

150

125AT

14

50

2

T8

Y7

S8

60

160

170

150AT

22

50

2

T9

Y8

S9

80

195

205

175AT

22

50

2

T10

Y9

S10

100

220

225

200AT

30

65

2 1/2

T11

Y10

S11

125

255

265

250AT

30

65

2 1/2

T12

Y11

S12

150

280

295

30

80

3

T13

Y12

S13

175

305

345

30

80

3

T14 T15

Y13 Y14

S14 S15

200 250

330 375

355 400

30

80

3

50

90

3 1/2

300AT 400AT



C. Allowable Short Circuit Current Calculation The allowable short circuit current for low-voltage thermoplastic (PVC) insulated wire/cable is given byWhere: Isc = Allowable short circuit current 2

A = cross sectional area of copper conductors, mm t =time of short circuit current, seconds

K = 104.484, computed constant for thermoplastic copper conductor where the rated wire operating temperature is 75 ˚C and the maximum short circuit temperature is 150 ˚C

Table VII.1 Maximum Short Circuit Withstand of Low Voltage Cables CU WIRE SIZE mm2 3.5 5.5 8 14 22 30 50 60 80 100 125 150 175 200 250

Maximum Short-Circui t Withstand Current in Amperes 1/2 Cycles 4,006 6,295 9,157 16,024 25,180 34,337 57,228 68,674 91,565 114,456 143,071 171,685 200,299 228,913 286,141

1 Cycle 2,833 4,451 6,475 11,331 17,805 24,280 40,466 48,560 64,746 80,933 101,166 121,399 141,633 161,866 202,332

2 Cycles 2,003 3,148 4,578 8,012 12,590 17,168 28,614 34,337 45,783 57,228 71,535 85,842 100,149 114,456 143,071

3 Cycles 1,635 2,570 3,738 6,542 10,280 14,018 23,363 28,036 37,381 46,727 58,408 70,090 81,772 93,453 116,817

4 Cycles 1,416 2,226 3,237 5,665 8,903 12,140 20,233 24,280 32,373 40,466 50,583 60,700 70,816 80,933 101,166

5 Cycles 1,267 1,991 2,896 5,067 7,963 10,858 18,097 21,717 28,955 36,194 45,243 54,291 63,340 72,389 90,486

6 Cycles 1,156 1,817 2,643 4,626 7,269 9,912 16,520 19,824 26,433 33,041 41,301 49,561 57,821 66,081 82,602

D. SIZING OF CONDUITS Percent Conductor Fill formula is given byWhere: D = interior diameter of conduit d = diameter of conductor (wire) n = number of conductors

According to PEC Table 9.1.1.1 the percent fill of (more than two) conductors in a conduit should not exceed 40%.



III.

BUSDUCT SYSTEM Busduct system shall be considered to be used for main feeders and risers. Busduct may be of copper or aluminum conductor material; whichever the project budget dictates. A. Bu sd uc t Si zing s hal l b e bas ed o n t he f ollo wing c on sider ation s – 5. 6. 7. 8. 9.

IV.

The voltage rating of the busduct shall be 600V. The busduct rating shall not be less than the demand load to be served. Voltage drop not exceeding 2% shall be considered in sizing the busduct. The ambient temperature consideration in sizing the busduct shall be 40°C. The kAIC rating of busduct shall be selected to withstand the maximum available short circuit current and shall be coordinated with that of its upstream OCPD.

Overcu rrent Protecti on not over 600V Circuit Breakers shall be the standard overcurrent protective devices of equipment and conductors for low voltage systems. Air Circuit Breakers shall be used for main switchgears and synchronizing panels. Molded Case Circuit Breakers shall be used for distribution, power, and lighting panelboards. A. Sizing of Circuit Breakers shall be based from the following considerations: 1. The next higher size of circuit breaker above the ampacity of the conductors being protected shall be permitted up to 800A circuit breaker rating except – a. The conductors being protected supply branch circuit muti-outlet receptacles. b. The conductors being protected supply motor branch circuit. 2. Where the circuit breaker exceeds rating over 800A, the ampacity of the conductor it protects shall be equal or greater than the rating of the circuit breaker. 3. The interrupting capacity of the circuit breaker shall be greater than the maximum available three-phase short circuit current.

V.

Reserved



VI.

LIGHTING AND RECEPTACL E OUTLET CIRCUIT A. Ligh ting Circ ui ts 1.

2. 3.

Individual lighting circuit shall be sized on the maximum of 2500VA. a. If not otherwise specified, each lighting fixture shall be assumed with a minimum of 100VA rating. b. A voltage drop not exceeding 3% shall be considered in each branch circuit. Lighting circuit installation shall be in accordance with PEC. Lighting system design criteria shall be based on Ayala Land Inc. Building Standards.

B. Receptacle Outlet Circuits 1.

2.

Individual receptacle outlet circuit shall be sized on the maximum of 1800VA. a. Each receptacle outlet shall be assumed with a minimum of 180VA rating. b. A voltage drop not exceeding 3% shall be considered in each branch circuit. Receptacle outlet circuit installation shall be based on PEC a nd Ayala Land Inc. Building Standards.

INTENTIONALLY LEFT BLANK



MOTOR ELECTRICAL DESIGN (NOT applicable for fire pump motor)

VII. A.

Moto r Elec tr ic al Syst em Des ign shall be based on the following considerations: 1. Size the branch circuit wire not less than 125% of the PEC-defined motor full load current. a. Since the operating temperature of motors is above 30°C (i.e., mostly 40°C) , the branch circuit wire shall be coordinated to this temperature rating, by dividing the PEC-defined motor full load current to the ambient temperature correction factor, then sizing the branch circuit wire using this corrected ampacity. 2. Size the motor disconnect not less than 115% of the PEC defined motor full load current. For uniformity, the size of motor disconnect shall be equal to the ampacity of the branch circuit wire. 3. From PEC Table 4.30.4.2 size the Inverse time circuit breaker OCPD at 250% of the PEC defined motor full load current. 4. Motor controller, including overload protection will be the scope of Mechanical / Sanitary contractor, subject to Electrical Design Engineer’s review.

Table VII.1 Motor Electrical System Design, Sizing of Feeders and Circuit Breakers Motor HP hp 1/2 3/4 1 1 1/2 2 3 5 7 1/2 10 15 20 25 30 50 60 75 100 125 150 200 250 300

Full Load Currents, 3Φ 230V 400V 460V 2.2 3.2 4.2 6 6.8 9.6 15.2 22 28 42 54 68 80 130 154 192 248 312 360 480 -

1.3 1.8 2.3 3.3 4.3 6.1 9.7 14 18 27 34 44 51 83 103 128 165 208 240 320 403 482

1.1 1.6 2.1 3 3.4 4.8 7.6 11 14 21 27 34 40 65 77 96 124 156 180 240 302 361

230V 3.5mm2 3.5mm2 3.5mm2 3.5mm2 3.5mm2 3.5mm2 5.5mm2 8.0 mm2 8.0 mm2 22 mm2 30 mm2 38 mm2 38 mm2 80 mm2 100 mm2 150 mm2 250 mm2 2-125mm1 2-150mm2 2-250mm2

SIZE OF WIRES 400V

460V

230V

3.5mm2 3.5mm2 3.5mm2 3.5mm2 3.5mm2 3.5mm2 3.5mm2 5.5mm2 5.5mm2 8.0 mm2 14 mm2 22 mm2 30 mm2 50 mm2 50 mm2 80 mm2 125 mm2 200 mm2 250 mm2 2-125mm2 2-200 mm2 2-250mm2

3.5mm2 3.5mm2 3.5mm2 3.5mm2 3.5mm2 3.5mm2 3.5mm2 3.5mm2 5.5mm2 5.5mm2 8.0 mm2 14 mm2 22 mm2 38 mm2 38 mm2 50 mm2 80 mm2 125 mm2 125 mm2 250 mm2 2-125mm2 2-150 mm2

20AT 20AT 20AT 20AT 20AT 30 AT 40 AT 70AT 70AT 100 AT 150 AT 175 AT 200 AT 400 AT 400 AT 500 AT 800 AT 800 AT 1000 AT 1200 AT

SIZE OF ITCB 400V 460V 20AT 20AT 20AT 20AT 20AT 20AT 30 AT 40 AT 50 AT 70AT 100 AT 125 AT 125 AT 200 AT 300 AT 400 AT 500 AT 600 AT 600 AT 800 AT 1000 AT 1200 AT

20AT 20AT 20AT 20AT 20AT 20AT 20AT 30 AT 40 AT 70AT 70AT 100 AT 100 AT 175 AT 200AT 250 AT 400 AT 400 AT 500 AT 500 AT 800 AT 1000 AT

*Based from PEC 4.30.14.4



B. Air con ditioning and Refr igerating Equ ipment Elec tr ic al Sy st em Design shall be based on the following considerations: 1. Size the branch circuit wire not less than 125% of the motor – compressor rated – load current or the branch – circuit selection current, whichever is greater. a. Since the operating temperature of motors is above 30°C (i.e., mostly 40°C) , the branch circuit wire shall be coordinated to this temperature rating, by dividing the motor – compressor rated – load current to the ambient temperature correction factor, then size the branch circuit wire using this corrected ampacity. 2. Size the motor disconnect not less than 115% of the motor – compressor rated – load current. For uniformity, the size of motor disconnect shall be equal to the ampacity of the branch circuit wire. 3. From PEC Table 4.30.4.2 size the Inverse time circuit breaker OCPD at 250% of the motor – compressor rated – load current. 4. Motor controller, including overload protection will be the scope of Mechanical / Sanitary contractor, subject to Electrical Design Engineer’s review.




VIII.

DESIGN FOR MOTOR DRIVEN FIRE PUMP SYSTEM B. Fire Pump Electrical System shall be designed to meet the following requirements, as defined in the Philippine Electrical Code: 1. Dedicated overcurrent protective device (OCPD) and disconnecting means must be sized to indefinitely carry the locked-rotor current of the fire pump motor(s) and associated pump(s). 2. The circuit components serving the fire p ump must be chosen to withstand the available short circuit current at the point of installation. 3. Fire pump feeder must be sized to have an ampacity of not less than 125% of the full load current of the fire pump motor(s) and pressure maintenance motor(s), considering – a. The feeder conductor ampacity shall be corrected to coordinate with the fire pump motor’s design ambient temperature. b. The voltage at the fire pump controller terminal shall not drop more than 15% below nominal voltage during starting conditions. c. The voltage at the fire pump controller terminal shall not drop more than 5% below the nominal voltage during running conditions when the motor is operating at 115% of its full load current (capacity). Table VII.1 Firepump Electrical System Design, Sizing of Feeders and Circuit Breakers Firepump Motor Rated Horsepower

Full Load Current*

Locked Rotor Current 380V**

Size of OCPD

Size of Feeder

Maximum Circuit Length

hp 20

Amp 34

Amp 204

AT 200

sq.mm. 30

m 300

264 306 396 498 618 768 990 1248 1440 1920 2418

250 300 400 500 600 800 1000 1200 1600 2000 3000

30 30 50 50 60 80 125 200 250 2-150 2-200

300 300 300 300 300 300 400 400 400 500 500

25 44 30 51 40 66 50 83 60 103 75 128 100 165 125 208 150 240 200 320 250 403 *Based from PEC 4.30.14.4

**Assumed 6-times the motor full load current



C. Schematic Design for Fire Pump Normal Power Source Feeder Redundant Power Source Feeder in se arate route Fire Pump ATS Feeder Tap for Jockey Pump Fire Pump Motor Controller

Fire Pump Motor Jockey Pump Motor

D. Design Calculatio n Example A 150hp Nema Design B fire pump motor has a full load current of 240Amp. Its associated pressure maintenance pump is rated 5hp having a full load current of 9.7Amp. The maximum ambient operating temperature is 40 °C. The power supply is 400V, 3Φ, 60hz. a. Sizing of feeder wire to the fire pump cont roller 150hp, 380V, 3Φ FLC 240A x 1.25 = 300A 5hp, 380V, 3Φ FLC 9.70A x 1.25 =12.13A Total FLC =312.13A, say 312A And so, the minimum ampacity of feeder conductors is 312A. Correcting the conductor ampacity to 40 °C by dividing 0.88, we yield 354A. Using 75 ˚C temperature rating of 600V rated building wires; a 250mm 2 copper conductor is the minimum size as per PEC Table 3.10.1.16



b. Voltage Drop Considerations Where: VD = Voltage Drop NV = Nominal Voltage at Source I = 1.15* FLC for running condition or I = LRC for starting condition R = DC resistance ohm/305m L = Feeder wire length

Using the above formula, the feeder wire, 200mm 2 copper conductor, must not exceed 200m length to satisfy both motor starting and running voltage drop limitations. c. Sizing of OCPD and ATS

150hp, 380V, 3Φ FLC 240A x 6 = 1,440A ( locked rotor current) 5hp, 380V, 3Φ FLC 9.70A x 6 = 58.20A Total RLC =1,498.20A say, 1,498A And so, the total locked rotor current is 1,498A, assuming Nema Design B code F. The next higher standard size of OCPD (circuit breaker) and ATS is 1600AF/AT




IX.

CAPACITOR BANK SIZING A. Capacitor Bank design shall satisfy the following basic considerations: 1. The size of the capacitor bank should be able to correct system power factor from 0.8 to 0.95 . 2. The ampacity of the capacitor feeder conductor shall not be less than 135% of the rated current of the capacitor. 3. The capacitor bank shall be provided with a means of discharging stored energy. 4. Capacitor bank specification must consider harmonic in selecting the type of capacitor, and contactor switches.

Table VIII.1 Capacitor Bank Sizing based from Mai n Transformer Sizes

Nominal Transformer Rating

Power Factor Before Compensation

Power Factor After Compensation

Nominal Capacitor Bank Rating

300 500 750 1000 1500 2000 2500 3000

0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8

0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95

100 150 250 300 450 600 750 900

B. Schematic Design of Capacitor Bank

To Low Voltage Switchgear Capacitor Feeder Capacitor Overcurrent Protection

Discharge Resistor

Capacitor Bank



C. Design Calculati on Proc edure Calculate the size of capacitor bank in a 1MVA electrical system, to be able to correct the system power from 0.8 to 0.95.

Based from the power triangle, S = 1000 KVA Cos Φ1 = 0.8 ; Φ1 = 36.87° Cos Φ2= 0.95 ; Φ2 = 18.19° Also, Sin Φ1 = Q1/S Q1 = S*sinΦ1 Q2 = S*sinΦ2

Solving for Qc, Qc = Q1 - Q2 Qc = S (sinΦ1 - sinΦ2) = 1000(0.6 - 0.312) Qc = 288 KVAR say, 300kVAR

And so, the rating of the capacitor is 300kVAR. Selecting capacitor sensitivity of 5%15%, provide 6 – steps of 50kVAR.



X.

PANELBOARD DESIGN 400 / 230V Syst ems A. Design Load Schedule for 3-phase 400 / 230V System

PANEL FED FROM

: :

DP-TEMPLATE (ENCODE PANEL SOURCE)

MAIN CIRCUIT BREAKER MAIN FEEDER SIZE SYSTEM VOLTAGE

: : :

100 Y4 230

3Ø

VOLT AMPERE

AF 80 (SEE WIRING LEGEND) VOLTS

BRANCH AMPERE LOAD CKT NO. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

LOAD DESCRIPTION (Encode Loads) (Encode Loads) (Encode Loads) (Encode Loads) (Encode Loads) (Encode Loads) (Encode Loads) (Encode Loads) (Encode Loads) (Encode Loads) (Encode Loads) (Encode Loads)

Ø AN

ØBN

ØCN

B RA NC H CI RCU IT BR EA KE R

12.00 8.00

2,760 1,840 1,500 1,500 2,300 2,760 1,150 1,380 1,840 1,840 2,300 2,300

6.52 6.52 10.00 12.00 5.00 6.00 8.00 8.00 10.00 10.00 -

TOTAL CONNECTED LOAD: LOCATION ENCLOSURE MOUNTING

: : :

31.00

29.04

42.00

AT, 3-POLE, CENTER MAIN

0.00

POLE

AMPERETRIP

CODE

WIRE

RACEWAY

1P 1P 1P 1P 1P 1P 1P 1P 1P 1P 1P 1P 1P 1P 1P 1P 1P 1P

50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50

30 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20

S1 S0 S0 S0 S0 S0 S0 S0 S0 S0 S0 S0 S0 S0 S0 S0 S0 S0

THWN THWN THWN THWN THWN THWN THWN THWN THWN THWN THWN THWN THWN THWN THWN THWN THWN THWN

PVC SCH 40 PVC SCH 40 PVC SCH 40 PVC SCH 40 PVC SCH 40 PVC SCH 40 PVC SCH 40 PVC SCH 40 PVC SCH 40 PVC SCH 40 PVC SCH 40 PVC SCH 40 PVC SCH 40 PVC SCH 40 PVC SCH 40 PVC SCH 40 PVC SCH 40 PVC SCH 40

23,469 MAIN CB KAIC RATING BRANCH CB KAIC RATING APPLIED DEMAND FACTOR

(ENCODE PANEL LOCATION) (ENCODE TYPE OF ENCLOSURE, NEMA RATING) (SURFACE, FREE-STANDING, FLUSH-MOUNTED, ETC)

B RA NCH CIRC UIT WI RIN G

AMPEREFRAME

: : :

80

kAIC kAIC %

Table IX.1 Load Schedule Template 3-phase 400 / 230V System

B. Three-Phase 4-wire + gro und 400V / 230V Systems To 400V 4W+G 3-phase Source

3-Pole Main Circuit Breaker

to 400V 3-phase Loads, other panelboards, etc. to 230V single-phase Loads

ΦA ΦB

ΦC

N G



XI.

STANDARD SYSTEM ARCHITECTURE









XII.

Reserved

XIII.

Reserved

XIV.

References



Prepared by:

Nathaniel S. Acosta Technical Services Engineer

Noted by:

Approved by:

Artem io C. Pug at Jr . Electrical Section Head

Roger N. Tiguelo CG-MEPF Head


Fundamental Design Calculations - Electrical

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