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 21 Sep – 27 Sep 2026
1/3 substations fully compliant
| Meter | Voltage | THD | Unbalance | Frequency | Availability | Overall |
|---|
| 🏭 Driefontein Substation's — busbar = Eskom point of supply |
| ⏻ Busbar (Eskom supply) | 100.61–103.49% | 1.5% | ok | ok | 5% ⚠ | FAIL |
| Ballito Sub (Feeder 1) (33KV) | 100.99–104.27% | 1.0% | ok | ok | 5% ⚠ | FAIL |
| Zimbali Sub (Feeder 2) (33KV) | 100.47–104.41% | 2.1% | ok | ok | 5% ⚠ | FAIL |
| ⚠ Eskom: unbalance |
| 🏭 Shakaskraal Substation — busbar = Eskom point of supply |
| ⏻ Busbar (Eskom supply) | 101.99–103.69% | 0.9% | ok | ok | 5% ⚠ | FAIL |
| Shakaskraal-Feeder 1 (North) (33KV) | 101.6–103.43% | 0.7% | ok | ok | 5% ⚠ | FAIL |
| Shakaskraal-Feeder 2 (South) (33KV) | 102.21–103.81% | 1.2% | ok | ok | 5% ⚠ | FAIL |
| ⚠ Eskom: unbalance |
| 🏭 Stanger Substation — busbar = Eskom point of supply |
| ⏻ Busbar (Eskom supply) | 101.81–105.2% | 0.93% | 1.0% | ok | 57% ⚠ | PASS |
| Stanger-Feeder 1 (33KV) | 101.8–105.05% | 0.9% | 1.0% | ok | 5% ⚠ | PASS |
| Stanger-Feeder 2 (33kV) | 101.78–105.19% | 0.84% | 1.0% | ok | 5% ⚠ | PASS |
| Stanger-Gelnhills Feed (33KV) | 101.77–105.04% | 0.9% | 1.0% | ok | 5% ⚠ | PASS |
| Stanger-Groutville Phase1 (33KV) | 99.78–108.16% | 1.6% | 3.71% | ok | 5% ⚠ | FAIL |
| Stanger-Sappi Feed 1 (33KV) | 101.8–105.17% | 0.9% | 0.97% | ok | 57% ⚠ | PASS |
| Stanger-Sappi Feed 2 (33KV) | 101.81–105.23% | 0.9% | 0.96% | ok | 6% ⚠ | 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.