As with all risk assessments, an arc flash survey should be periodically reviewed, for example every 2 years.
The length of time will depend upon the nature of the installation.
The following occurances should also trigger a review of the assessment irrespective of the time scale.
- Change in supplier fault levels
- Additional sources of supply to installation
- New switchgear fitted or existing altered
- Alterations to protection settings
- Change in transformer impedances