FAQ
Crew questions
Short, plain answers to what electricians and apprentices ask us most.
Can I use a non-contact voltage tester to prove a circuit is dead?
No. A non-contact tester is a first look. Prove dead with a two-pole voltage indicator, proved before and after on a proving unit or known source. See the testers page.
What do CAT II, CAT III and CAT IV mean?
They are measurement categories under IEC 61010. CAT III covers distribution inside buildings, such as consumer units and sub-boards. CAT IV covers the origin of the installation, nearer the supply. A higher category tolerates bigger transient surges. Choose the rating for where you actually work.
Are 1000 V insulated screwdrivers a legal requirement?
The Electricity at Work Regulations 1989 require precautions against injury. Tools made and tested to IEC 60900, with the double-triangle mark, are the usual way to meet that. Check your employer's risk assessment.
How often should test gear be calibrated?
Follow the manufacturer's advice and any employer or scheme rules. Many installation test instruments are calibrated yearly. Pocket testers are checked against a known source before use.
Which strippers suit twin and earth?
A self-adjusting pair that covers 1.0 to 6.0 mm² without nicking the copper. Test on scrap first. More on the cutters page.
How many lumens does a pocket torch need?
200 to 400 lumens with a usable low mode is enough for most pocket work. Check the IP rating and the runtime on low. See the lights page.
What stays in the van?
Installation testers, drills, rods, label printers, ladders and spare kit. See the full list.
Do you take payment for reviews?
No. Our pages are independent. Brand names appear as examples of a type of tool, not as endorsements.
How do I ask a question that is not here?
Use the contact tool on the contact page to build a message, then email it to [email protected].