SANS 10142 Testing Principles Series: Why We Test – Before We Sign
⚡ SANS 10142 Testing Principles Series: Why We Test – Before We Sign
Introduction – This Is Not Just a Test… It’s a Responsibility
Every electrician knows the moment.
You stand in front of a Distribution Board.
Your test equipment is ready.
Your name is about to go onto a Certificate of Compliance (COC).
But here’s the real question:
👉 Do you fully understand what you are signing for?
Because when you sign a COC, you are not just completing paperwork…
You are making a legal declaration that the installation is safe.
As clearly stated in the COC documentation:
“This certificate is not valid unless all sections have been completed correctly and the test report is attached.”
And more importantly:
You are confirming that the installation has been inspected and tested according to regulations.
⚖️ Why Testing Is Not Optional
According to the Electrical Installation Regulations:
No installation may be connected to the supply unless it has been inspected, tested, and a COC issued by a registered person.
This means:
- Testing is not best practice
- Testing is not a recommendation
- Testing is a legal requirement
And if something goes wrong?
👉 The responsibility traces back to the person who signed.
🛠️ What Is the Purpose of Testing?
The core purpose of testing is simple—but critical:
From the training material:
The aim is to ensure that people, animals, and property are protected from hazards under both normal and fault conditions.
So testing is about:
- ✅ Verifying safety
- ✅ Confirming correct installation
- ✅ Ensuring protection devices will operate
- ✅ Identifying hidden faults
- ✅ Preventing future failures
Testing is not about ticking boxes.
It is about proving that the installation is safe under real-world conditions.
📋 The Heart of Testing – Section 4 of the COC
If you look at the COC Test Report, everything comes down to Section 4.
This is where:
- Inspection is confirmed
- All measurements are recorded
- Compliance is verified
And most importantly…
👉 This is where the 15 mandatory tests are conducted.
These tests are not random.
They are structured to evaluate the installation from basic integrity → fault conditions → operational safety.
🔍 The 15 Tests – Our Roadmap for This Series
Over the next few days, we will break down each of these tests in detail:
- Continuity of bonding
- Resistance of earth continuity conductors
- Continuity of ring circuits
- Earth fault loop impedance
- Neutral loop impedance
- Prospective short circuit current (PSC)
- Elevated voltage on neutral
- Insulation resistance
- Voltage at DB (no load)
- Voltage at DB (on load)
- Operation of earth leakage units
- Earth leakage test button
- Polarity
- Phase rotation
- Functional testing (switching)
Each one of these tests answers a specific safety question.
And if you skip one?
👉 You are leaving a gap in your verification.
⚠️ The Reality Most Electricians Ignore
Here’s the truth many don’t want to hear:
If one test fails, the installation is not compliant.
According to SANS testing principles:
- If a fault is found → it must be corrected
- The test must be repeated
- Any affected tests must also be redone
And the most powerful warning of all:
“When in doubt – DO NOT ISSUE THE CERTIFICATE.”
This is where professionalism separates from shortcuts.
🎓 Where TDMI Training Stands
At TDMI Training, this is exactly where we draw the line.
We don’t train electricians to pass assessments.
We train electricians to take responsibility.
Our approach is simple:
- No guessing
- No shortcuts
- No “it should be fine”
👉 Only measured, verified, compliant work
Because when you understand why each test exists,
you don’t look for ways around it—you respect it.
That’s the difference between:
- Someone who can do the job
vs - Someone who can stand behind their signature
And in this industry, that difference matters.
🔗 Bringing It All Together – Electrician & Consumer Responsibility
The COC also clearly states:
The user or lessor is responsible for the safety and maintenance of the installation.
This means:
- The electrician ensures compliance at handover
- The owner ensures safety over time
And this is where platforms like Nearby Electrician play a critical role—
connecting consumers with verified, compliant professionals who understand this responsibility.
🚀 What’s Next?
This is just the beginning.
In the next blog, we start with:
👉 Test 1: Continuity of Bonding
We will break it down:
- What it is
- Why it matters
- How to test it
- Common mistakes
- Real-world risks
💡 Final Thought
A COC is not a form.
It is a statement of truth.
And every test you perform is a piece of that truth.
👉 Test properly
👉 Understand deeply
👉 Train correctly
👉 Sign responsibly
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