KEY DEFINITIONS OF SSEG
There is a lot of confusion and interpretation of the different requirements of grid tied systems when it comes to the centralised disconnect device (CDD), fireman’s switch, Anti-islanding, and soon to be Dead Grid Safety Lock (DGSL) OR accessible disconnect switch . Let me try to summarise and explain them below:
Dear Grid Safety Lock (DGSL) or Accessible Disconnect switch – Is already a requirement for Eskom SSEF connection approvals, but could soon be part of the SANS 10142-1-2 requirements. It does not fulfil the same role as the NRS 097-2-1 or Anti-islanding, but serves as a fail safe in addition to the NRS097 requirements, to make sure that no power will be fed back towards the grid during a power outage. For customers with a dedicated feeder/transformer (like farmers, industrial, commercial), they have the option to install an accessible disconnect switch that will allow the utility to switch off the entire SSEG system (disconnect on the AC side) at their point of supply. The DGSL will be a requirement for shared feeders like residential customers.
Make sure you comply with your municipal requirements.