October 2013
Intermediate to advanced
192 pages
8h 30m
English
Content preview from Electric Wiring, 3rd Edition
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Control of circuits 7
Control of circuits
Lighting circuits
Lighting circuits may be controlled from any number of positions. For
example, hall, staircase or bedroom lighting is often conveniently controlled
from two separate positions. This requires a two-way switch at each point
and two extra wires, known as strapping wires, connecting these switches.
The 'common' terminal on each switch can make contact with either
strapping wire, but not both at once, so that one or other of the strapping
wires carries the current when the circuit is closed (see Figs. 1.5, 1.6
and 1.7).
Extra control may be obtained by inserting one or more intermediat
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.