Single phase wiring uses two wires to deliver power at voltages up to 240V and is suitable for small appliances. Three phase wiring uses three conductors and a neutral wire to deliver continuous power at 415V, making it suitable for larger homes and allowing multiple appliances to run in parallel more efficiently. While single phase wiring has lower installation costs, three phase wiring provides more stable power delivery and is recommended for homes with higher power needs or air conditioning units over 1.5 horsepower. Upgrading from single to three phase requires applying to the electricity provider and can take several weeks and cost between RM2,000-10,000 depending on the home size.

1. DIFFERENCE BETWEEN SINGLE PHASE
WIRING AND THREE PHASE WIRING
Group Member: Penny Leung
Tan Shen Sin
Lim Hao Zheng
Shum Wen Jun
Benson Sow Wei Henn

2. Single Phase Wiring
Single Phase Wiring
• The single phase requires two wires for
completing the circuit, the conductor and the
neutral.
• Peaks in voltage at 90⁰ and 270⁰, with a complete
cycle at 360⁰ (see chart below.) With these peaks
and dips in voltage, power is not delivered at a
constant rate
• The single phase supplies the voltage up to 240
volts. It is mostly used for running the small
appliances like a fan, cooler, grinder, heater

3. Three Phase Wiring
• The three phase system consist four wires, three conductors
and one neutral.
• is continuous and never completely drops to zero.
• All three phases of power have entered the cycle by 120⁰. By
the time a complete cycle of 360⁰ has completed, three
phases of power have each peaked in voltage twice
• In basic terms, three-phase electricity means that electricity
is delivered to your house using three power lines instead of
one.
• Makes your house less risk to blackout
• Usually suitable for larger homes such a bungalows or semi-
detached homes
DELTA CONNECTION STAR CONNECTION

4. SINGLE PHASE SUPPLIES THREE PHASE SUPPLIES
• Take single lane highway as an example.
• Voltage power provided is limited
• Take multiple or 3 lanes highway as example.
• Voltage power provided is extremely high and
running multiple appliances in parallel.

5. DIFFERENCE
BETWEEN SINGLE
PHASE WIRING AND
THREE PHASE
WIRING
Malaysia
50Hz Single phase 240V
3-phase 415V
240V

6. Single Phase
wiring
installation

7. 3 phase wiring
installation in
multi-storey
building

8. Advantages of Single Phase Wiring
- The conductor can be quite lightweight and compact in size,
which also results in the supporting tower becoming lighter. The
unit is, overall, quite a portable one.
EFFICIENT
TRANSMISSION
- The efficiency of the transmission increases, ensuring that
the unit operates at its optimum.
LESS SUBSTATION
REQUIRED
- The substations can also be located near to the high voltage
grid, which reduces the initial cost of transmission.

9. Disadvantages of Single Phase Wiring
- Insulation depends on the voltage of the unit, whilst the size of
the wire will depend on the current. So, whilst the motor will run
quite efficiently, it will be costly to insulate.HIGH INSULATION
COST
CANNOT HANDLE
OVERLOAD
NOT UNIFORM
TORQUE
- This is a result of the frequency and can affect operation quality.
- If your application is likely to overload the system, this is
not the best motor choice and you would be better off looking
elsewhere.

10. 1. For transmitting the same amount of power at the same voltage ,a three phase transmission line
requires less conductor material .
2. 3-phase induction motor is self-started and is more efficient .
3. High in power to weight ratio .The size of 3-phase alternator is small and the overall cost of the
alternator is reduced for the generation of power .
4. The instantaneous power is always constant which results in smooth and vibration free operation of
machine .
ADVANTAGES OF THREE PHASE WIRING

11. 1. High cost in repairing and to restore the service ,the spare unit cost is high when the 3-phase transformer
is not working .
2. Failure of one phase puts the entire transformer out of service .
3. Complex system ,requires symmetrical components for analysis and operation .
DISADVANTAGES OF THREE PHASE WIRING

12. • Single phase wiring system u Three phase wiring system
“Generally, if you have 3 or fewer air-conditioning units, and each are between
1 – 1.5 horsepower, you should be fine with single-phase power. But if the
horsepower of your ACs are higher, consider changing to three-phase to
prevent power trips” – Ganesan, an electrician from Megah Global Electrical
and Construction.

13. Why should you go for three phase
wiring instead of single phase wiring?
▪ The cost to install and maintain three-phase systems is substantially lower than that
of single-phase systems.
▪ Three phase so you can split the loads, first phase is for lighting and fans etc; Second
phase is for mix, grinder, TV, and others; Third phase is for AC, Inverter system etc
▪ This makes your house less at risk of a blackout. If one of the power lines stops
delivering power to your estate, your house may still have power because the other
two lines may not be affected, hence you would get continuous power supply.
“To upgrade from a single-phase power supply to a three-phase power, you
will need to apply through Tenaga Nasional (TNB) as they will be the ones
who will send contractors to test and evaluate whether if upgrading to
three-phase power is a feasible option”.
The upgrading process can take up to three weeks and the cost may
starts from RM2,000 and can go as high as RM10,000 depending on
the size of your house.

14. Thank You