Per-substation NERSA compliance verdict. The busbar = the combined feed = Eskom point of
supply; a parameter failing at the busbar is an Eskom issue, one
failing on a single feeder only is a local network issue.
Weekly = 95th-percentile of 10-min values; quarterly = weeks-within-limit.
Week of 20 Jul – 26 Jul 2026
1/3 substations fully compliant
| Meter | Voltage | THD | Unbalance | Frequency | Availability | Overall |
|---|
| 🏭 Driefontein Substation's — busbar = Eskom point of supply |
| ⏻ Busbar (Eskom supply) | 101.48–103.94% | 1.8% | ok | ok | 41% ⚠ | FAIL |
| Ballito Sub (Feeder 1) (33KV) | 100.75–105.12% | 1.2% | ok | ok | 41% ⚠ | FAIL |
| Zimbali Sub (Feeder 2) (33KV) | 100.59–104.44% | 2.6% | ok | ok | 41% ⚠ | FAIL |
| ⚠ Eskom: unbalance |
| 🏭 Shakaskraal Substation — busbar = Eskom point of supply |
| ⏻ Busbar (Eskom supply) | 102.07–105.0% | 1.05% | ok | ok | 41% ⚠ | FAIL |
| Shakaskraal-Feeder 1 (North) (33KV) | 101.67–104.81% | 0.8% | ok | ok | 41% ⚠ | FAIL |
| Shakaskraal-Feeder 2 (South) (33KV) | 102.31–105.44% | 1.4% | ok | ok | 41% ⚠ | FAIL |
| ⚠ Eskom: unbalance |
| 🏭 Stanger Substation — busbar = Eskom point of supply |
| ⏻ Busbar (Eskom supply) | 102.07–105.5% | 0.92% | 1.07% | ok | 100% | PASS |
| Stanger-Feeder 1 (33KV) | 102.09–105.39% | 0.9% | 1.06% | ok | 41% ⚠ | PASS |
| Stanger-Feeder 2 (33kV) | 102.05–105.47% | 0.9% | 1.07% | ok | 39% ⚠ | PASS |
| Stanger-Gelnhills Feed (33KV) | 102.07–105.38% | 0.9% | 1.06% | ok | 41% ⚠ | PASS |
| Stanger-Groutville Phase1 (33KV) | 99.25–108.62% | 1.6% | 4.16% | ok | 41% ⚠ | FAIL |
| Stanger-Sappi Feed 1 (33KV) | 102.05–105.47% | 0.9% | 1.05% | ok | 100% | PASS |
| Stanger-Sappi Feed 2 (33KV) | 102.07–105.37% | 0.9% | 1.08% | ok | 41% ⚠ | PASS |
| ⚠ Local: unbalance (10266107) |
How to read: green = within NRS 048-2 limit, red = breach, grey = no data.
Voltage cell = 5th–95th percentile (% of Vn, limit 90–110%); THD ≤ 8%; Unbalance ≤ 2%; Frequency ±1%.
Quarterly cells show weeks-within-limit. Availability < 95% (⚠) means the verdict is
low-confidence — fill the gaps (catch-up reads) before relying on it for NERSA.