Emergency lighting Manual key switch provides a simple and low cost method of assessing and testing Emergency Lights. This is done by interrupting the permanent mains supply which occurs when then insertion and activation of an EL key. Is present. Emergency lighting keys can also be known as a fish key. Some Key features of an Emergency lighting key switch are that they are extremely cost effective methods of testing luminaires and a number of lights can be tested at one time, which makes it time effective.
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