L.18.101 All tools when operating only under battery power and their battery packs shall be so designed
that the risk of fire or electric shock as a result of abnormal operation is obviated as far as is practical.
Compliance is checked by the following tests.
The battery tool and battery pack, as is appropriate, are to be placed on a soft wood surface covered by
two layers of tissue paper; the battery tool and battery pack are to be covered by one layer of untreated
100% cotton medical gauze. The test is to be conducted until failure or the test sample returns to room
temperature. A new sample can be used for each fault listed below. There shall be adequate protection
against electric shock as defined in L.9 and L.13 and no charring or burning of the gauze or tissue paper
shall result when a battery tool and battery pack are subjected to any one of the following fault conditions
shown below in tests a) to f).
Charring is defined as a blackening of the gauze caused by combustion. Discolouration of the gauze
caused by smoke is acceptable.
Thermal cut-outs and thermal overloads may operate during the above tests. In this case, the same test
is to be repeated 3 more times, using 3 additional samples. The resistance for the short in items a), b),
d), e) and f) shall not exceed 10 m
Ω
.
a) The terminals of a
″
detachable
″
battery pack with exposed terminals are shorted. Battery
pack terminals that can be contacted using either figure 1 or figure 2 probes are considered
exposed. The means of shorting shall not attain excessive temperatures so as to char or ignite
the tissue paper or gauze.
b) The motor terminals are shorted.
c) The motor rotor is locked.
d) A cord provided between the separable battery pack and the battery tool shall be shorted at
the point likely to produce the most adverse effects.
e) A cord provided between the tool and the charger shall be shorted at the point likely to
produce the most adverse effects.
f) For battery tools a short is introduced between any two uninsulated parts of opposite polarity
not in accordance with the spacings given in L.28.101.
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