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

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Apr 16, 2020

WIRE SIZING AND MCB SELECTION FOR RESIDENTIAL BUILDING

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

MCB SELECTION












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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

 


MCB SELECTION

MCB SELECTION

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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

MCB SELECTION
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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

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

MCB SELECTION

MCB SELECTION

MCB SELECTION

MCB SELECTION


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MCB SELECTION FOR LIVING ROOM

MCB SELECTION

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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


MCB SELECTION

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


MCB SELECTION

MCB SELECTION

MCB SELECTION

MCB SELECTION
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MCB SELECTION FOR KITCHEN & DINING ROOM

MCB SELECTION

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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


MCB SELECTION


1 SOCKET OF 6 AMPS
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

MCB SELECTION

MCB SELECTION

MCB SELECTION

MCB SELECTION



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MCB SELECTION FOR BEDROOM 1

MCB SELECTION

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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


MCB SELECTION

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


MCB SELECTION

MCB SELECTION

MCB SELECTION

MCB SELECTION
.

MCB SELECTION FOR BEDROOM 2

MCB SELECTION











.
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


MCB SELECTION



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


MCB SELECTION

MCB SELECTION

MCB SELECTION

MCB SELECTION



.

MCB SELECTION FOR BATHROOM


MCB SELECTION



.
PASSAGE CALCULATION

Spot Light = 3 Nos
Utility Socket = 2 Nos


WATTS CALCULATION FOR BATHROOM


MCB SELECTION

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

MCB SELECTION

MCB SELECTION

MCB SELECTION

.
MCB SELECTION FOR PASSAGE

MCB SELECTION





 BELOW YOU ARE GOING TO FIND WIRE SIZING FOR EACH MCB


WIRE SIZING FOR MCB

MCB SELECTION
MCB SELECTION

..


ALSO READ: HOW TO CHOOSE THE RIGHT MCB BREAKER CURRENT RATING

ALSO READ: LOAD RATINGS OF USUAL HOUSEHOLD APPLIANCES | AMPS AND WATTS RATINGS

Must read: What Tests Should Be Carried Out on Electrical Installation?

Must read: All You Want Know about Wiring of Buildings



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9 comments:

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

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

    ReplyDelete
  3. How much Total length of cable sir

    ReplyDelete
  4. Can we combine LL and PL mcb

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

    ReplyDelete
    Replies
    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.

      Delete
  6. Anonymous02 July, 2022

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

    ReplyDelete
  7. great idea but really confusing.

    ReplyDelete

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