AS/NZS 61439.1 is a standard that assists in ensuring electrical equipment, such as switchboards, is safe and functions properly. The standard is applied in Australia and New Zealand and is founded on international standards. It maintains electrical systems reliable and safeguards individuals against hazards such as electrical shock or fires.

What This Standard Covers

This standard encompasses electrical equipment that operates on voltages of up to 1,000 volts AC or 1,500 volts DC. It covers various kinds of electrical systems that are fixed or moveable with or without protective enclosures. Such systems are for the generation, transmission, and distribution of electricity and for the control of machines consuming electric energy. The standards also cover special cases, such as electrical appliances used on trains or ships, as long as other safety conditions are satisfied.

Main Changes in AS/NZS 61439.1

Increased Temperature Limits

One of the most significant changes is the temperature limits allowed for electrical parts while they function. Previously, the maximum permissible temperature was 105°C. The new regulations permit main busbars—the metal components that conduct electricity—to be 105°C above the ambient air. This can raise the amount of electricity they can conduct. But higher temperatures can make the materials degrade more quickly. For instance, if a busbar made of copper operates at 105°C, it would last between 20 and 25 years but at 130°C would have a lifespan of 11 to 18 years.

Replacing Components with Other Brands

The rule lays down how and when various makes of electrical components may be applied to a switchboard. As global regulations leave little room for variation, the Australian and New Zealand standard allows makers to substitute parts from different brands provided certain conditions are satisfied and the equipment is rated for up to 3,150 amps. Should the switchboard require higher, testing is necessitated to ensure that the spares used are safe and operate efficiently.

Reducing the Risk of Arc Faults

An arc fault occurs when electricity arcs through the air, which can result in fires and injury. The new regulations feature improved methods of preventing such hazardous incidents. One of these is permitting the use of European arc fault containment tests (IEC TR61641), which ensure electrical systems can properly sustain arc faults and minimize damage to humans and equipment.

Making Sure Systems Meet Safety Standards

The standard offers various methods of ensuring an electrical system is safe and functioning properly. These tests involve ensuring the equipment is rust-resistant, capable of withstanding stress, UV ray-protected, electric shock-safe, and capable of withstanding mechanical impact. Another significant test is ensuring parts do not overheat, as this can destroy equipment and lead to safety risks.

Methods of Verifying Electrical System Designs

There are three primary methods of ascertaining that an electrical system is up to standards. The first is testing, in which components of the system are physically tested to confirm that they are working properly. The second is comparison, in which a design is compared to another already-tested design. The third is testing, wherein calculations and safety regulations are applied to ensure the system is properly designed. The techniques ensure that all switchboards and electrical panels are safe and efficient.

Transitions from Old to New Standards

The AS/NZS 61439 regulations formally replaced the previous AS/NZS 3439 regulations in May 2021. This was done to align with international standards and simplify the process of ensuring that electrical systems are constructed properly. The previous regulations were sometimes vague regarding testing systems and who should ensure they were safe. The new standard clarifies these issues and ensures businesses use the same rules.

How This Standard Impacts Companies

These regulations impact numerous individuals who deal with electrical systems. Companies need to ensure the electrical systems they create comply with the new standard, so they will have to revisit their designs and testing procedures. Electricians and engineers who put together switchboards must adhere to the regulations concerning testing and confirmation of systems. When they modify an already existing system, they have to ensure that the modifications are safe. Customers and companies should also know about such regulations to ascertain that the electrical equipment they purchase and use is safe and effective.