Introduction

Helping you make informed and cost-effective decisions regarding the installation of Air Conditioners in South Africa.

Installing a new air conditioner can be a big decision – not just for your comfort, but also for your pocket.

Here are some practical tips to help you understand your options and potentially reduce your installation costs, while staying compliant with SANS 10142. (Particularly Clauses: 6.16.4.1 and 6.16.1.2).

Disclaimer.

Although SOS Air Conditioning Systems continuously strive to offer practical tips for saving money on your air conditioning unit, installation and maintenance, it is important that you reference and understand the official, complete, and up-to-date requirements as well as to consult the current edition of SANS 10142-1 as issued by the South African Bureau of Standards (SABS) or other authorised distributors. Compliance must always be verified against the official document.

Note: It is therefore of utmost importance, that you always cross-check the requirements against the latest official SANS 10142-1 to ensure legal compliance and safety.

In the realm of electrical systems, there exists an often overlooked but indispensable component known as the isolator switch or also known as the disconnect switch. This unassuming device plays a critical role in ensuring the safety and optimal functioning of various appliances, including air conditioners. In this article, we will delve into the importance of isolator switches, shedding light on their purpose and highlighting why they are essential in air conditioner installations, and when they are required to be installed, as this can amount to a large initial outlay.

1. What is the Key Purpose and Benefit of an isolator switch?

The primary purpose of an isolator switch, known as an isolation switch or disconnect switch, is to provide a means of completely isolating an electrical circuit or equipment from its power source. It serves as a vital safety device in various electrical systems and installations.

• Safety during maintenance and repairs:

Isolator switches are used to disconnect the power supply to equipment or circuits to ensure the safety of  personnel performing maintenance, repairs, or installation work. By isolating the power source, it prevents accidental contact with live electrical components, reducing the risk of electric shock or injury.

• Emergency shutdown:

In the event of an electrical malfunction, fire, or any hazardous situation, an isolator switch provides a quick and accessible means to cut off the power supply to the affected circuit or equipment. This action helps mitigate potential risks and prevents further damage.

• Equipment protection:

Isolator switches can safeguard electrical equipment from damage during maintenance or when the equipment is not in use. By disconnecting the power supply, it prevents power surges, electrical faults, or voltage spikes that could harm sensitive components.

• Compliance with electrical regulations:

Electrical codes and regulations often require the installation of isolator switches in specific applications to ensure safety standards are met. By incorporating isolator switches, electrical systems can adhere to these regulations and maintain compliance.

• Lockout/Tagout procedures:

Isolator switches are an essential component of lockout/tagout procedures, which are used to control hazardous energy sources during maintenance, servicing, or repairs. By isolating the power supply through an isolator switch and applying lockout or tagout devices, authorised personnel can work safely without the risk of unexpected energisation.

Overall, the main purpose of an isolator switch is to provide a safe and effective means of isolating electrical circuits or equipment from their power source. It promotes electrical safety, protects personnel and equipment, and allows for maintenance and emergency procedures to be carried out without exposing individuals to electrical hazards.

Does an air conditioner need an isolator South Africa?

In South Africa, electrical installations are regulated by the South African National Standards (SANS) and the Wiring Code (SANS 10142-1). These regulations provide guidelines for the installation of electrical equipment, including air conditioners. They specify the requirements for isolation, protection, and safety measures to be implemented.

1. Know Your Unit Size (BTU & Amperage):

According to the regulations, it is typically necessary to have an isolator switch specifically dedicated to the air conditioner for units above 12,000 BTU (e.g. 18000 BTU and up), The amperage varies between different models and types like Inverter vs non-inverter air- conditioners.

For more information on the difference between an inverter and non-inverter you can visit our buyer guide on our website or read the follow blog

      2. When a Isolator / Disconnector is Recommended:

A dedicated isolator may be advisable to protect your unit from surges – especially with load shedding and in many cases an unstable supply of power / electricity in South Africa.

SANS 101426 (16.4.1) basically states, that dedicated circuits shall be provided for fixed space heating and cooling (air-conditioning units) rated at more than 16 A. (More than one unit may share a circuit, provided each unit has its own switch-disconnector)

           3. Use Existing Plug Points Where Safe:

The good news as mentioned above, is that most 12000 BTU air conditioners are below 16A, and if your plug point is safe to use, you are not required to install an isolator, which is roughly as of 14 August 2025 a R 3 000.00 three thousand rand saving on the installation of your new air conditioner. (However, it is always advisable to contact your insurance company to find out what their requirements are with regard to installing a disconnect switch / Isolator)

           4.  Always Consult a Qualified Electrician:

To ensure compliance with local regulations and to ensure the safety of the air conditioning installation, it is advisable to consult with a qualified electrician. A qualified electrician can help with the assessment of the specific requirements of your installation and determine the appropriate isolator switch and electrical safety measures needed for your air conditioner.

            5.  Ask for a Transparent Quote:

A good installer should be able to explain the cost difference between using a plug point vs installing a disconnector / Isolator, and what is safest and compliant for your home.

In summary

In South Africa, with the loadshedding, and unstable power supply, it is highly recommended that a dedicated isolator switch be fitted for all air conditioners by a qualified electrician. I cannot stress this enough and as mentioned above, this is an important safety measure that allows for the disconnection of power to the unit during maintenance, repairs, or emergencies, ensuring the safety of individuals and compliance with electrical regulations.

SOS Air Conditioning Systems continuously strives to make purchasing your air-conditioner as cost effective and hassle free as possible, and should you have any questions we will be more than happy to assist. Please don’t hesitate to call our office on 082 305 7612  or email Sonia at info@sosairconsystems.co.za

Remember: Choosing the cheapest is not always best, but understanding your options puts the power back in your hands.