ABSTRACT
The use of extra-low-voltage wiring for fire alarms and call systems has been discussed in the previous two chapters. Other applications occur in laboratories, where permanently installed reduced-voltage outlets are required for various experiments. Permanent outlets are easier for the staff than the use of accumulator batteries which have to be carried from preparation room stores and set up on the laboratory benches for each experiment. Reduced-voltage supplies are also needed for microscopes which have a built-in light for illuminating the slide.
