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Electrical Wiring in the Home/Multiple timers on one circuit (single circuit breaker)

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Question
Our sprinkler system operates through a programmable timer.  We installed a timer switch for our exterior garage light on the same circuit (same circuit breaker, different outlet) and it now interferes with the sprinkler programming.  Every time the garage light goes on, the sprinkler's program gets messed up.  This occurs both when the light timer is in the programmed mode and the light cycles on, and when the garage light program is off and the light is turned on manually.  This does not happen in reverse: when the sprinkler turns on, it does not affect operation of the garage light.
Can you explain what is happening and what we can do to fix the problem?  Thank you.

Answer
Mary,

It shouldn't interfere so check your connections and make sure they are correct and tight. In other words make sure the sprinkler isn't switched with the light which could throw it off. Sprinkler timers usually have a back up battery to keep them going in the event of an outage which would tend to negate what I just said but check it anyway and see what you find.

Bob  
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PASCACK VALLEY ELECTRIC Bob Mossman

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Licensed Master Electrician (32 years) 6165B Contractor in Closter New Jersey with 40 years total experience in Residential - Commercial - Industrial work. Emergency Service - General trouble shooting and repair work - ONAN & GENERAC generator installation - Paddle fans - Kitchen & Bath exhaust fans - AC lines - Smoke detectors - Telephone lines - Cable TV lines - Computer network cabling - Exterior lighting - Recessed lighting - Security lighting - (200 - 150 - 100 amp service up grades) - Electric Heat - New circuits - New appliance hook ups - and more ! FREE ESTIMATES 201-358-1552 Fully Insured

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Licensed contractor in Closter New Jersey.

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"The Frank Williams School of Electrical Construction". My dear old boss is 100 ! and still going God Bless him. I started working for "Tenafly Electric" right out of high school at 19. He was tough but I learned more working for him in 8 and half years than most guys. We did mostly industrial work while doing some commercial and residential so I was fortunate to be exposed to all 3 areas of electrical construction. The guys I worked with were all good guys and I stay in touch with some of them still. Most of us went into our own buisness's which says something about the caliber of the guys I worked with. We had some interesting clients : Wella Corp. of shampoo fame, Farah Fawcett etc, I didn't buy shampoo for 10 years. It was a great place to work. Pan Am the former airline just before they went under, another great place to work, nice clean environment. C&C Metals, the largest button manufacturer in the US at that time, a not so clean environment but a very interesting place to work, lots of machine's cranking out buttons of all kinds but you had to be on your toes, it was a potentially dangerous place to be . All kinds of action going on around you.

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