Seaward B255 - Manual (Page 25)

Operating Manual Clare B255 Power Tool & Appliance Test Station
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Readings in the red zone usually mean that the Earth wiring of the product is
faulty and should be investigated further.
Similarly, if the recorded readings show an increase in value from one routine
test to the next, it may indicate a loose connection, corroded terminals or
partially broken Earth wire. Again further investigation may be required.
NOTE - Where exposed metal parts do not form part of a continuous surface
with all other exposed metal the Earth test must be repeated with the earth
clip attached to each exposed metal surface in turn.
Flash Test – Line+Neutral to Earth
The supply switch of the tool or appliance must be in the ON position to
ensure that all ‘live’ parts are included when applying a Flash test. For
contactor or electronic start products refer to the Earth Leakage section.
Set the Test Selector to -
1250V LN-E for most normal equipment.
500V LN-E for heavily suppressed equipment.
Depress the PRESS TO TEST button and observe the TEST RESULT lamps.
The green FLASH PASS lamp should come on.
If the red FLASH FAIL lamp glows and the audible alarm sounds, one of the
following conditions is indicated –
a) The insulation is unsatisfactory, permitting a leakage current in excess of
the nominal 5mA at test voltage,
Do not apply earth tests for more than 5 seconds or more
than 2 tests per minute.
The high Earth test current will cause a certain amount of
self-heating, to both the appliance wiring and the test
circuitry. To keep this within acceptable limits and prevent
over-heating.
Flash testing can be hazardous - Do not touch the product
under test.
Any faults must be repaired or corrected before carrying out
other tests.