Amps = 18.125
Voltage loss = voltage drop × length of cable × amps
Voltage loss = 0.011 × 30 × 18.125 = 5.98volts
Check does it comply with the 2.5% rule:
5.98/240 × 100/1= 2.49% (under 2.5%)
Table for cable size CB.S6004&6346(circuit 1)
Circuit 2
Microwave = 1100 watts
Kettle = 2250 watts
Toaster = 1150 watts
Radio = 100 watts
Amps = watts/volts
Using a 240 volt supply: Amps =4600/240
Amps = 19.17
Voltage loss = voltage drop × length of cable × amps
Voltage loss = 0.0073 × 32.1 × 19.17 = 4.49volts
Check does it comply with the 2.5% rule:
4.49/240 × 100/1= 1.87%(under 2.5%)
Table for cable size CB.S6004&6346(circuit 2)
Circuit 3
Refrigerator = 1725watts
14”Tv = 51 watts
Washing machine = 2200 watts
Amps = watts/volts
Using a 240 volt supply: Amps =3976/240
Amps = 16.6
Voltage loss = voltage drop × length of cable × amps
Voltage loss = 0.011 × 23.70 × 16.6 = 4.31volts
Check does it comply with the 2.5% rule:
4.31/240 × 100/1= 1.8% (under 2.5%)
Table for cable size CB.S6004&6346(circuit 3)
Circuit 4
Electric shower = 9000 watts
Amps = watts/volts
Using a 240 volt supply: Amps =9000/240
Amps = 37.5
Voltage loss = voltage drop × length of cable × amps
Voltage loss = 0.0073 × 21 × 37.5= 5.75volts
Check does it comply with the 2.5% rule:
5.75/240 × 100/1= 2.4% (under 2.5%)
Table for cable size CB.S6004&6346(circuit 4)
Circuit 5
Room1: Radio = 100watts
Room2: Music system(60 watts) + 14”Tv(50watts) = 110 watts
Room3: 14”Tv = 50watts
Room4: Radio = 100watts
Sitting room: Computer = 270watts
Living room: 28”Tv with dvd(125watts) + Music system(60watts) = 185watts
Garage: Power drill = 750watts
Amps = watts/volts
Using a 240 volt supply: Amps =1565/240
Amps = 6.521
Voltage loss = voltage drop × length of cable × amps
Voltage loss = 0.029 × 31 × 6.521= 5.86volts
Check does it comply with the 2.5% rule:
5.86/240 × 100/1= 2.4%(under 2.5%)
Table for cable size CB.S6004&6346(circuit 5)
Department of Construction and Architecture
Class: CS1B
Module: Building and environmental science2
Title: Assignment
Student Name: Brian O’Mahony
Lecturer Name: Kevin Coleman
Submission Date: 15-04-2008
