Pat Testing in Nottingham, Derby, Mansfield

Electrical Tests

Electrical testing of portable equipment will involve the following:

  • (i) Earth bond continuity tests
  • (ii) Insulation resistance testing
  • (iii) Functional checks

(a) Earth Bond Test (Class 1 equipment only):

Readings should show less than 0.1+R Ohms (where R is the resistance of the lead)
Tested at a current of 1.5 times the rating of the fuse and no greater than 25A for a period of between 5 and 20 seconds or with a short-circuit test current within the range 20mA to 200mA.

(b) Insulation Resistance Test:

The applied test voltage should be approximately 500 Vdc

  • Class 1 heating equipment < 3kW 0.3M Ohms
  • Class 1 All other equipment 1M Ohms
  • Class 2 Equipment 2M Ohms
  • Class 3 Equipment 250k Ohms

(c) Optional Tests:

Flash Test: No flashover or breakdown shall occur

Operation/Load test: Compare reading with stated details on nameplate

Earth leakage test:

  • Class 1 Handheld Appliances 0.75mA
  • Other Class 1 Appliances 3.5mA
  • Class 2 Appliances 0.25mA

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