⚡ Service Interval Guide
Electric Fence Testing
South Africa
A fence that looks active may carry zero voltage. Bi-annual test under SANS 10222-3:2023 with Certificate of Compliance issued on every visit.
0V
Voltage on fences that appear active but aren't
SANS
10222-3
Compliance standard
Q: How do I know if my electric fence is working properly?
An electric fence should be tested bi-annually by a qualified electrician using a calibrated fence tester. A compliant residential fence must deliver minimum output voltage under SANS 10222-3:2023. Visually intact fencing can carry zero voltage due to earth faults, corroded connections, or energiser failure — making it completely ineffective despite appearing active. A Certificate of Compliance is issued on every test by a registered energiser installer.
What the bi-annual electric fence test covers
✓Output voltage test — calibrated tester measures actual delivered voltage at multiple fence zones
✓Earth stake resistance — poor earthing is the most common cause of low voltage; measured to SANS 10222-3 specification
✓Energiser health check — output current, pulse rate, and battery backup condition
✓Continuity test — identifies broken strands, corroded joins, and short circuits
✓Warning sign compliance — SANS 10222-3 requires warning signs at specific intervals
✓Battery backup load test — backup duration measured under actual load
✓Certificate of Compliance — issued by a registered energiser installer on every visit
Book electric fence test + COC
SANS 10222-3:2023 · Registered energiser installer · Certificate of Compliance issued
Why fences fail silently
The most dangerous failure mode is a fence that appears fully operational but delivers zero voltage. This happens when the energiser loses power from a tripped breaker, the battery backup depletes during load shedding, a corroded connection creates a complete earth fault, or vegetation grows into lower strands and drains the charge. In all these cases, the fence looks identical whether live or dead. The only way to know is to test it.
Load shedding risk: Extended Stage 4–6 load shedding depletes energiser battery backups within 12–16 hours. A fence that was live at 6pm can be completely dead by midnight during a long shedding cycle. Bi-annual testing verifies backup duration under real load conditions.
Frequently asked questions
Is a Certificate of Compliance required by law?+
SANS 10222-3:2023 requires a CoC after installation and significant repair. Most home insurers require a valid CoC to honour burglary claims where the electric fence failed.
What joule rating is required?+
A residential fence must not exceed 5 joules stored energy under SANS 10222-3:2023. Typical residential energisers operate at 1–3 joules. Your technician verifies correct energiser rating for your fence length.
How long does the test take?+
A standard residential fence test takes 45–60 minutes depending on fence length and number of zones.
Every HomeGuard Pro service is performed by an employed RCE Electrical & Plumbing Services technician — Home Affairs identity verified, SAPS background checked, PIRB or DOL trade qualified, and publicly liability insured.