Replacing regular Light Switch with Timer

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  #1  
Old 03-14-14, 09:38 PM
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Replacing regular Light Switch with Timer

I bought this timer (see picture, sorry it is somewhat blurry) to replace a light switch to control a porch light.

It seems fairly simple to install. It has two black wires, the directions say to take the two wires on the timer, twist together with the two wires from inside the wall and connect together with caps provided.

My question is with both of these wires being black, and no indication of which is positive or negative, how do I know which wire on the timer gets connected to which wire inside my wall?
 
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Old 03-14-14, 10:37 PM
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There is no positive and negative in AC, just ungrounded conductors and grounded conductors. In this case it doesn't mater which is which. Both are ungrounded conductors. One is power in and one is power out but but the switch doesn't care. Electric will flow either direction.
connect together with caps provided.
Look very carefully inside the "caps". Is there a metal spring inside? if not throw them a way and use real wire nuts.
 
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Old 03-15-14, 07:57 AM
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I haven't looked yet but if it has metal soring just use a cap that is all plastic on the inside?

thank you for the response.
 
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Old 03-15-14, 08:03 AM
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No, use a cap that DOES have a spring. Better connection.
 
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Old 03-15-14, 08:06 AM
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if it has metal soring just use a cap that is all plastic on the inside?
No. This is what I wrote.
Is there a metal spring inside? if not throw them a way and use real wire nuts.
Real wire nuts have a spring in them. Cheap wire nuts included with products sold at BigBox often don't have them.
 
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