Testing IEC Leads and Mains Extensions
PAT Testing Power leads
Most modern PAT testers have a handy IEC lead test facility. All one has to do during PAT Testing is to plug in both ends of the lead and test Earth Continuity, Insulation IEC protection Class for LED luminaires
Resistance and Polarity. The Polarity test just checks that the lead is wired correctly. This can only be done if one has access to both sides of a power cord.
On other PAT testers there is a facility for a 2-stage test of power leads. The first stage is a test of Earth Continuity and Insulation Resistance by plugging both ends of the lead into the PAT tester. The second stage is a check of the polarity by plugging the power lead into the mains and the other end to the tester. Couple of lights on the PAT Tester show whether the polarity of the power lead is correct or wrong.
PAT Testers that do not have this facility can use a power lead tester that is available as an accessory. This is used in a 2-stage test.
Stage 1: The lead is plugged into the PAT Tester and the lead tester. The test lead is clipped onto a post provided on the IEC lead tester and the Earth Continuity and Insulation Resistance test is carried out.
Stage 2: The power lead is now plugged into a mains socket and also into the IEC lead tester. The two lights on the tester show whether the polarity of the IEC cable is correct or faulty.
When PAT testing long IEC leads one needs to remember to adjust the pass limits as outlined in the IEE Code of Practice.
PAT Testing Mains extension leads