Understanding AS/NZS 61439: Impact on Electrical Contractors
AS/NZS 61439, effective in Australia and New Zealand from May 2021, brings with it the required updates on the regulations pertaining to low-voltage switchgear and controlgear. The new standard is a regional adaptation of the international IEC 61439 standard, doing away with the earlier...
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How To Install Surge Protective Devices As Per AS/NZS 3000
This article gives information on how to install Surge Protective Devices (SPDs) in order to protect against transients overvoltages generated by powerline disturbances and natural phenomena such as lightning striking near exposed conductors, according to Clause 2.7.3. SPDs are not intended to protect against...
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Earth Rod – The Importance in Electrical Safety
In every modern electrical system, safety is important and one key element that ensures electrical safety is the earth rod—also known as the grounding rod. In Australia, the earth rod is an essential component of electrical installations, providing protection against electric shock, electrical fires,...
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Lockable GPO (General Purpose Outlets) – Comprehensive Guide
A lockable GPO is a general-purpose outlet designed with a locking mechanism to prevent accidental disconnection or disruption of electrical connections. These innovative solutions offer enhanced safety and reliability for various applications. This article provides an overview of lockable GPO features, specifications, and use...
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Safety Services in Electrical Installations – AS/NZS:3000
Electrical installations can have unique safety services, particularly when classified as ‘special electrical installations,’ as outlined in Section 7 of the standards. The Role of Safety Services Safety services constitute critical functions to ensure the operations of essential systems during emergency conditions. The services...
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DC Circuit Breakers – What are the Different Types?
DC circuit breakers are electrical switches designed to interrupt the flow of electric current during overloads, short circuits, or faults, providing overcurrent protection to prevent overheating, fires, and component damage. Purpose Circuit breakers protect electrical circuits by automatically opening them to prevent damage from...
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DC Circuit Breakers – What are the Key Applications?
DC circuit breakers are indispensable elements in current power systems, designed to interrupt the DC current flow in the presence of faulty conditions, overloads, or short circuits. Automatically, they open circuits that are dangerous, thus preventing overheating, fires, and damage from electrical equipment. Even...
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What are Mechanical Services Switchboard (MSSBs)?
A Mechanical Services Switchboard is the electrical distribution panel, powering and governing the most fundamental building services. More so, such as mechanical, for instance, HVACs. In their attempt to concentrate MSSBs for better control of operations, ensure all services operate harmoniously, and are seamlessly...
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How does Type 2 Coordination in motor starters work?
Type 2 Coordination is a well-specification process developed many years back in Australia and New Zealand, hence used widely nowadays all over the world. As described in AS/NZS60947.4.1 Type 2 Coordination is the coordination of motor starter components – Contactor and Overload, and Short...
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How to calculate prospective short-circuit current
To calculate prospective short-circuit current, this usually implies the maximum fault current that would possibly occur at a point in an electrical system, one must consider factors such as the system voltage, the impedance of the system, and the type of fault. Here’s how...
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