Can I try GS38 Test Leads and Probes free on this page?

This guide is free to read, but there is no public quiz specifically for this topic on this page. Browse public practice samples for other subjects, or create an account for the learning path. This course section is free with an account.

Where does GS38 Test Leads and Probes sit in the City & Guilds scheme?

GS38 Test Leads and Probes maps to C&G 2365 Unit 201. On TradeTraining it lives in the Sparks Basics section as bite-size lessons with practice questions.

Why should a test probe show so little bare metal?

A long exposed tip can touch two terminals at once and create a short circuit. A shroud leaves only the contact point exposed, while the finger barrier helps keep the user's hand behind the insulated part.

What should happen to a test lead with taped insulation?

Take it out of use and replace the damaged lead or set. Tape does not restore the insulation or the protection expected of equipment used around live conductors.

Does a tester's voltage rating cover every measurement situation?

No. Suitability depends on the measurement environment, rating, accessories and intended use. Check the manufacturer's information and the relevant safety guidance.

GS38 Test Leads and Probes

Sparks Basics · C&G 2365 Unit 201 · Free course section with an account

A long bare probe tip can bridge neighbouring terminals. HSE guidance therefore favours a shrouded probe with very little metal exposed, an insulated handle and a finger barrier that stops a hand sliding towards the tip. Those details matter most in crowded boards, where a small slip can turn into a .

The lead needs sound insulation and protection against fault , either by suitable fusing or a current-limiting design. Check the probes, guards, shrouds and cable for damage before use. A cracked body, missing guard or taped lead is a reason to take the set out of service, not to trust it for one more reading.

describes safer test equipment; it does not make live testing safe for an untrained person. A competent person selects equipment suited to the point of work and follows a safe system of work, including proving a before and after checking for dead.

The accessories are part of the test system

Updated 26 October 2026

What to understand before practising

A suitable instrument can still be unsafe with damaged leads or unsuitable probes. Consider the leads, probe tips, insulation and protective features together with the measurement and the environment. GS38 is guidance on reducing risks, not a badge that excuses a pre-use check.

Sources

HSE: GS38 test equipment guidance — Choosing and maintaining suitable low-voltage test equipment.

This guide is free to read. There is no public quiz specifically for this topic yet. Explore the key terms below without leaving the page.

More Safe Isolation public samples Create an account for the learning path

Common questions

Can I try GS38 Test Leads and Probes free on this page?: This guide is free to read, but there is no public quiz specifically for this topic on this page. Browse public practice samples for other subjects, or create an account for the learning path. This course section is free with an account.
Where does GS38 Test Leads and Probes sit in the City & Guilds scheme?: and Probes maps to C&G 2365 Unit 201. On TradeTraining it lives in the Sparks Basics section as bite-size lessons with practice questions.
Why should a test probe show so little bare metal?: A long exposed tip can touch two terminals at once and create a . A shroud leaves only the contact point exposed, while the finger barrier helps keep the user's hand behind the insulated part.
What should happen to a test lead with taped insulation?: Take it out of use and replace the damaged lead or set. Tape does not restore the insulation or the protection expected of equipment used around live conductors.
Does a tester's voltage rating cover every measurement situation?: No. Suitability depends on the measurement environment, rating, accessories and intended use. Check the manufacturer's information and the relevant safety guidance.

Explore key terms

Open a term to read its meaning here, then close it or explore another. Free to use without an account.

GS38
HSE guidance on electrical test equipment used on low-voltage systems. It covers choosing and maintaining suitable instruments, probes and leads, including insulation, finger barriers and limiting exposed metal. Describing equipment as GS38-compliant is not a guarantee about its condition or use: the whole test arrangement and working method must suit the task.
Read the full GS38 glossary entry
Safe isolation
The procedure that proves a circuit dead before anyone works on it. Prove the voltage indicator against a known source, isolate the circuit, secure the isolation with your own lock and tag, prove the point of work dead across all conductor combinations, then prove the indicator again. The final step is the one that catches a tester that died mid-job.
Read the full Safe isolation glossary entry
Basic protection
Protection against touching live parts during normal, fault-free service. It is delivered by insulation around conductors, barriers and enclosures around terminals, and placing live parts out of reach. It is the first layer of shock protection; fault protection is the second, and an installation needs both.
Read the full Basic protection glossary entry