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Air Conditioners

RSA Bardo Electrical works together with Air Conditioning Company's by installing power to their units.

These AC Units are deemed fixed electrical equipment, and therefore require an isolator installed next to the condensor.

Every electrical installation requires the work undertaken, materials used and design to comply to the Wiring Code SANS 10142 and The Occupational Health and Safety Act. This requires that a registered person as defined (mater electrician, installation electrician or electrical tester for single phase) once completed and tested, will issue a Certificate of Compliance.

The Certificate shall be in the form of the Certificate of Compliance published in the Electrical Installation Regulations, 2009 and the Test Report shall be in the form of the test report in SANS 10142 8.8

Air Conditioners come in different sizes, which means they all draw varying amounts of power. 

Current is an important factor when designing the installation especially the peak current. 

AC single phase amps to kilowatts calculation

Calculation with line to line voltage

The power P in kilowatts (kW) is equal to square root of 3 times the power factor PF times the phase current I in amps (A), times the line to line RMS voltage VL-L in volts (V) divided by 1000:

P(kW) = √3 × PF × I(A) × VL-L (V) / 1000

Calculation with line to neutral voltage

The power P in kilowatts (kW) is equal to 3 times the power factor PF times the phase current I in amps (A), times the line to neutral RMS voltage VL-N in volts (V) divided by 1000:

P(kW) = 3 × PF × I(A) × VL-N (V) / 1000

SANS 10142 6.16.4 Refers to Air Conditioning, Refrigeration, freezer units, extraction and ventilation fans states that dedicated circuits shall be provided for air conditioning units that are rated at more than 16Amps. 

There may be more than one unit on each circuit and the power supply to each unit shall be controlled by a switch-disconnecter (Isolator).

The Switch-Disconnecter (Isolator) must be correctly rated, taking into account the number of poles, and the environment must also be taken into account.

Some installations take into the inrush current, which may trip a standard curve circuit breaker (C Curve) so a slow curve circuit breaker (D Curve) would be installed.

Call Rob if you would like more information on 071 533 64 66 or email: rob@rsa-electrical.co.za


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