Q$23.$ When testing a BS$/$EN $61009$ RCD at $50\%$ rated current the device should trip:

a$.$ After $40$ ms

b$.$ After $200$ ms

c$.$ Not at all

d$.$ After $300$ ms

Q$24.$ The instrument used to test an earth electrode is:

a$.$ Low reading ohmmeter

b$.$ High reading ohmmeter

c$.$ Insulation resistance tester

d$.$ Earth electrode tester

Q$25.$ When testing an earth electrode, the current spike is placed as close as possible to the earth electrode under test.

a$.$ True

b$.$ False

Q$26.$ When using the two electrode method of testing earth electrodes, at what approximate distance apart would the resistance between the two cease to increase?

a$.1$ m

b$.3$ m

c $10$ m

d$.100$ m

Q$27.$ Which is the final test that should be performed on an RCD$?$

a$.0\mathrm{.}5$ x rated current @ $180$ degrees

b$.1$ x rated current @ $180$ degrees

$5$ x rated current @ $180$ degrees

d$.$ Functional test