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What a voltage pen is, and is not, forCan a voltage pen prove dead?
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A single-pole detector tells you voltage is present. It cannot tell you a conductor is dead, so it has no place in safe isolation.
| What it is genuinely useful for |
|---|
| Detecting whether voltage is present in a cable at all |
| Detecting a PEN fault on a TN-C-S system |
| Touch voltage — gas engineers run one round a boiler, and it lights at anything above 50 V |
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