WIRE SIZING AND MCB SELECTION FOR RESIDENTIAL BUILDING -lceted LCETED INSTITUTE FOR CIVIL ENGINEERS

## Apr 16, 2020

IN THIS ARTICLE YOU ARE GOING TO KNOW ABOUT WIRE SIZING & MCB SELECTION FOR THREE-PHASE BUILDING

WE PRETTY MUCH SURE YOU WILL NOT HAVE PATIENCE OF SCROLLING 24 PAGES OF CALCULATION SO WE CUT TO SHORT. YOU CAN FIND FORMULA BELOW FOR CALCULATING SIZE OF MCB

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IF YOU HAVE PATIENCE PLEASE GO FOR IT, SCROLL DOWN. YOU WILL GET MORE INFO OF CALCULATING MCB FOR A HOUSE AND MAY BE A CHART TABLE FOR SIZING WIRE

ALSO USE: MCB CALCULATOR | BREAKER SIZE CALCULATOR

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LIVING ROOM CALCULATION

Led tubelight of 40 watts
Spot light = 4 nos
Ceiling fan = 2 nos
Tv = 1 nos
Utility socket = 3 nos .

WATTS CALCULATION FOR LIVING ROOM
1 SOCKET OF 6 AMPS
Amps To Watts
Watts = Amps x Voltage (220 India)
Watts = 6 x 220 = 1320 Watts

2 SOCKETS OF 15 AMPS
Watts = Amps x Voltage (220 India)
Watts = 15 x 220 = 3300
Watts = 2 Nos of sockets x 1320 = 6600 Watts

AMPS CALCULATION FOR LIVING ROOM
MCB SELECTION FOR LIVING ROOM

KITCHEN & DINING ROOM CALCULATION

Led Tubelight = 1 Nos
Spot Light = 4 Nos
Fridge Socket = 1 Nos
Chimney = 1nos
Utility Socket = 2 Nos

WATTS CALCULATION FOR KITCHEN & DINING

FRIDGE SOCKET
Fridge Wattage = 2400 Watts Per Day
So, we can use 15 amps socket which can withstand 3300 watts (220 x 15)
Fridge socket (15 Amps) Watts = 3300 Watts

2 SOCKETS OF 15 AMPS
Watts = Amps x Voltage (220 India)
Watts = 15 x 220 = 3300
Watts = 2 Nos of sockets x 1320 = 6600 Watts

AMPS CALCULATION FOR KITCHEN & DINING
BEDROOM 1 CALCULATION

Led Tubelight = 1 Nos
Spot Light = 4 Nos
Ceiling Fan = 1 Nos
T.L Socket = 2 Nos
Utility Socket = 3 Nos
A.C = 1 Nos

WATTS CALCULATION FOR BEDROOM 1
Amps To Watts
Watts = Amps x Voltage (220 India)
Watts = 6 x 220 = 1320 Watts

2 TV SOCKETS OF 6 AMPS
Watts = Amps x Voltage (220 India)
Watts = 6 x 220 = 1320
Watts = 2 Nos of sockets x 1320 = 2640 Watts

2 SOCKETS OF 15 AMPS
Watts = Amps x Voltage (220 India)
Watts = 15 x 220 = 3300
Watts = 2 Nos of sockets x 3300 = 6600 Watts

AMPS CALCULATION FOR BEDROOM 1

As per note this building is fully connected with the three-phase system
BEDROOM 2 CALCULATION

Led Tubelight = 1 Nos
Ceiling Fan = 1 Nos
T.L Socket = 1 Nos
Utility Socket = 3 Nos

WATTS CALCULATION FOR BEDROOM 2
1 SOCKET OF 6 AMPS
Amps To Watts
Watts = Amps x Voltage (220 India)
Watts = 6 x 220 = 1320 Watts

1 TV SOCKETS OF 6 AMPS
Watts = Amps x Voltage (220 India)
Watts = 6 x 220 = 1320
Watts = 2 Nos of sockets x 1320 = 1320 Watts

2 SOCKETS OF 15 AMPS
Watts = Amps x Voltage (220 India)
Watts = 15 x 220 = 3300
Watts = 2 Nos of sockets x 3300 = 6600 Watts

AMPS CALCULATION FOR BEDROOM 2

As per note, this building is fully connected with three phase system
BATHROOM CALCULATION

Led Light = 1 Nos
Spot Light = 1 Nos
Utility Socket = 2 Nos
Geyser = 1 Nos
Exhaust Fan = 1 Nos

WATTS CALCULATION FOR BATHROOM
2 SOCKETS OF 6 AMPS
Watts = Amps x Voltage (220 India)
Watts = 6 x 220 = 1320
Watts = 2 Nos of sockets x 1320 = 2640 Watts

AMPS CALCULATION FOR BATHROOM
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PASSAGE CALCULATION

Spot Light = 3 Nos
Utility Socket = 2 Nos

WATTS CALCULATION FOR BATHROOM
2 SOCKETS OF 6 AMPS
Watts = Amps x Voltage (220 India)
Watts = 6 x 220 = 1320
Watts = 2 Nos of sockets x 1320 = 2640 Watts

AMPS CALCULATION FOR BATHROOM

As per note, this building is fully connected with the three-phase system

BELOW YOU ARE GOING TO FIND WIRE SIZING FOR EACH MCB

WIRE SIZING FOR MCB

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1. Some dout are there. In this topic how can I ask you.

2. Some dout are there. In this topic how can I ask you.

1. you can send us message

3. How much Total length of cable sir

4. Can we combine LL and PL mcb

5. WHILE CALCULATING AMPS = WATT X DF/VOLT(1.732). WHAT/WHY THIS 1.732?

1. In a 3-phase system the voltage between any two phases is 3 times higher than the voltage of an individual phase by a factor of 1.73 (square root of 3 to be exact). ... A 220V system with three 220V phases has a 220 * 1.73 = 380V cross-phase voltage.

6. Anonymous02 July, 2022

Your calculation is Confused. You have used 3-Phase formula to get the total current (Amps) on Single phase.

7. great idea but really confusing.

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