Seaward B255 - Manual (Page 26)

Operating Manual Clare B255 Power Tool & Appliance Test Station
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b) A flash-over has occurred between the Earth path and one or other of the
Line and Neutral paths;
c) The presence of a high leakage suppression filter or high brightness neon
in the supply circuit gives rise to a total leakage current in excess of the
nominal 5mA at test voltage.
The appliance should be considered unsafe, clearly marked as such and
withdrawn for full workshop investigation and repair. It must be FULLY re-
tested following repair.
NOTE
Tools and appliances that fall into category ‘c’, and some heavy duty
equipment, particularly the larger power tools - such as 2500W angle grinders
etc., may have inherently higher leakages which require a pass level of up to
10mA at test voltage.
If this is the case, and provided that the manufacturer advises testing this to
a higher threshold, the 10mA Flash trip can be employed.
To apply the Flash Test using the increased trip threshold, first depress the red
10mA button and hold it in, then also depress the white PRESS TO TEST
button for 5 seconds, in the normal way.
The green FLASH PASS lamp should light. Release both buttons at the end of
the 5 second test period.
If the appliance still fails and the FLASH FAIL lamp and alarm come on, the
product must be considered unsafe. It should be clearly marked to show this
and withdrawn for full workshop investigation and repair. It must be FULLY re-
tested again following repair.
Testing in this 10mA mode increases the hazard to the
operator, remember - Do not touch the item under test.