These pages contain public updates regarding our work on Australian and IEC Standards, as well as other informative posts to answer questions that we are regularly asked. They are intended to provide readers with information regarding new developments, and the application of relevant standards.
We are often approached by clients who have just discovered (or been informed about) the world of hazardous areas. Typically an electrician or regulator has noticed that they handle flammable materials and asked a question such as "Can I see your HA verification dossier?" or "What is the hazardous area classification?" Alternatively, a contract or specification has called for a hazardous area verification dossier to be supplied.
This leads to enquiries such as "Can you supply me a HA verification dossier?". Unfortunately, the dossier is only a compilation of the various bits of design and compliance documentation that are needed to install or maintain equipment in a hazardous area.
The various steps to HA compliance for a new site are outlined in this post. These steps are equally valid for an existing site looking to bring their installation into compliance.
E-x Solutions can assist you with all of these steps, to ensure a safe and compliant installation.
The first step is for a competent person to complete a hazardous area classification to identify where explosive atmospheres are likely to occur continuously, in normal operation, or in expected abnormal operation.
A report detailing the classification methodology and decisions made to arrive at the zones is required, and drawings showing the zones are recommended.
Equipment selection, installation, and initial inspection
Any electrical equipment to be installed in the classified hazardous areas needs to be suitable for the Zone or EPL, Equipment Group, and Temperature Class set out in the HA classification.
The equipment selection and installation design needs to be completed by a designer competent to work on hazardous area installations.
The equipment needs to be installed by an installer competent to work with Ex Equipment.
Before being put into servce, an initial inspection at a detailed grade needs to be completed according to AS/NZS 60079.14 by a competent inspector.
There is no requirement in AS/NZS 60079.14 for independence between the designer/installer/inspector and they can all be the same person.
Requirements for competency can be found in AS/NZS 60079.14. Competency requirements can be satisfied by review of the design or installation.
In some jurisdictions a regulatory inspection or audit is required in addition to the initial inspection per AS/NZS 60079.14. This must be completed by an independent person who has not been involved in the design or installation.
For Queensland, any installation of electrical equipment in a hazardous area must be inspected by a hazardous area installation auditor appointed by the Electrical Safety Office.
The HA classification and details of the selected electrical equipment and installation need to be recorded in a hazardous area verification dossier.
The dossier needs to be updated over the life of the installation. Records of periodic inspections, any equipment maintenance or repair, and any changes to the HA classification or installation need to be included.
Maintenance and periodic inspections
The equipment needs to be maintained in accordance with AS/NZS 60079.17, including periodic inspection by a competent person at least every 4 years for all fixed electrical equipment. More regular inspection is required for portable equipment.
With the publication of the latest Hazardous Area installation standard AS/NZS 60079.14 the concept of Equipment Protection Levels [EPLs] has been implemented. This is designed to give larger companies the facility to apply an extended risk assessment and use a different level of protection than that which would normally be required by the zone of classification. A training video is available to fully explain what EPLs are and how they are intended to be used. Hopefully this will avoid creating artificial classification to achieve this end. For further information contact E-x Solutions on +61 8 8270 2177.
With the publication of Amendment 2 to AS/NZS 3000 in December 2012, the AS/NZS 2381, AS 2381 and AS 1076 series have been withdrawn. These standards may still be in use for existing sites and projects, however for new designs AS/NZS 3000 now directs the user to AS/NZS 60079.14 for hazardous area equipment selection and installation, AS/NZS 60079.17 for inspection and maintenance, and to AS/NZS 60079.10.1 and AS/NZS 60079.10.2 for the classification of gas and dust hazardous areas respectively.