Seaward B255 - Manual (Page 29)

Operating Manual Clare B255 Power Tool & Appliance Test Station
25
Earth Leakage Test (Class 2 Double Insulated Products)
This test is intended as an alternative to the relevant Flash Test for equipment
fitted with contactor, relay or low voltage ‘electronic’ start switching devices
(often referred to as ‘dead mans handles’), i.e. typically those products that
require the mains voltage to be present BEFORE any function switches can
operate.
WARNING
During the following test, the equipment being measured will be in it’s normal
operating state. Power tools and rotating machinery must be made safe
BEFORE starting the test – ensure that portable equipment is properly secure
and that any moving parts are adequately guarded to prevent damage or
injury.
Set the Test Selector to the Earth Leakage position, connect the green clip
lead to the green banana socket on the test output box. Attach the clip end to
the accessible metal of the item under test. NOTE – do not connect the clip
to any moving parts. Depress & hold the LOAD TEST button.
Now operate the product function switch(es) for normal running - the Earth
Leakage current will be displayed on the 0-5mA (lower) scale of the meter.
The leakage value must fall within the appliance manufacturer’s specifications
or conform to other relevant standards – typical values are shown in the chart
opposite.
Release product switches and the LOAD TEST button as soon as a reading
has been taken.
Typical Earth Leakage Values
The values above are for guidance only, product specific values must be
determined from manufacturer data.
Class I portable appliances
Class I stationary appliances
Class II appliances
Hand-held Tools
To BS EN 50144
Household
Appliances
To BS EN 60335
Luminaires
To BS EN 60598
IT Equipment
To EN 60950
0.75mA
-
0.25mA
0.75mA
0.75mA per
kilowatt
0.25mA
1.0mA
-
0.5mA
0.75mA
3.5mA
0.25mA