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FOR MANAGERS AND OPERATORS 21 directly to the switch binding posts. C-C are the switch "contacts." The fuses attach between binding posts a-a and b-b, this switch requiring the use of link fuses (A, Fig. lo) or plain fuse wire. B, Fig. 6, is arranged for cartridge fuses, such as are shown in Fig. g. B, Fig. 6 and A, Fig. 7, shows cartridge fuses in place. Switches should invariably be mounted on slate, porcelain or other insulating base, slate being the most common mate- rial for this purpose. Tt is important that contacts c-c. Fig. T. 6, be kept clean and smooth. They will, where strong current is used, become roughened in course of time, due to arcing when the switch is opened. This may be smoothed off with a fine file, but if the contacts are charged at the time you must stand on an insulating mat or a wooden chair while doing it and avoid touching both contacts at once, or anything which will ground you, or you will get a shock. Live wires may be handled with impunity provided you are completely insulated from the ground and don't touch bcmh wires at the same time. A dry wooden chair insulates you for ordinary voltages. An asbestos, rubber or lineoleum mat does the same. There is no danger from an ordinary shock from lines charged up to 220 volts, though you can get a "jolt" that will make you take very decided notice. Also it is possible to be painfully burned by even that voltage, though such a thing is very tmlikely to occur. The point T wish to make, however, is that you may touch and work with a "live" switch contact or wire when necessary by exercising care in keeping yourself insulated. SWITCHES SHOULD INVARIABLY BE MOUNTED EITHER HORIZONTALLY OR SO THAT THE SWITCH HANDLE WILL HANG DOWNWARD WHEN THE SWITCH IS OPEN. This is of importance, since if mounted the other way there is always liability of the switch lever accidentally falling into place, thus closing the switch, which might cause you to get some unpleasant shocks, and even, under certain circumstances, do other and much worse dam- age. The fuse end of the switch (where the fuse is attached i!o the switch base) should always be the "dead" end. That is to say: binding posts, i and 2, Fig. 6, A, should be the