Wiring Diagram Symbols and Terminology
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I am trying to install a new digital pool timer. The schematic on the backside has a connection terminal under each of these symbols/letters NO, NC, COMM and an M with ~ under it © By: Dave Rongey |
Wiring Diagram Symbols
Question:
I am trying to install a new digital pool timer.
The schematic on the backside has a connection terminal under each of these symbols/letters NO, NC, COMM and an M with ~ under it (has 2 terminals). I know the COMM is common or HOT but I don’t know the others. Can anyone help? I have 4 wires and 5 connection terminals.
This Innovation Model ET-2 timer is an exact replacement of the old timer.
I just purchased the house and this timer was disconnected because it no longer worked so they connected the hot wire to the pump and would flip the breaker to turn on.
Electrical Question from Aneta about Wiring Symbols
Received from Aneta a Handywoman in Harrietta Ca
Dave’s Reply:
Thanks for your electrical question.
Aneta –
The timer you have is used to control a function of the pool device. To do this the timer is basically a clock that is set to turn your pool equipment on or off at a specified time. This is accomplished by a relay which is identified by the letters and symbols.
Here is a brief explanation of what you are describing here – Listed below:
Comm = The Line or Incoming Hot
NO = Normally Open (or OFF)
NC = Normally Closed (or ON)
M is the symbol for the Time Clock Motor
~ is the symbol for AC Power (from my perspective, the voltage us unknown)
Because you are dealing with Pool Equipment, I would strongly advise you to hire a Licensed Electrician to do this for you and make sure that the proper GFCI protection and grounding is in place.
Electricity and Pool Equipment is no place for a novice – Sorry, but it’s for Safety!
The Following links will assist you with your electrical question:
For more information about Wiring Symbols
Wiring Diagrams and Symbols
This link is helpful as a Handywoman
Do-It-Yourself Electrical
Make sure not to miss these Resources for: Other
Home Electrical Wiring Resources
Be Careful and Be Safe – Never Work on Energized Circuits!
For Best Results Consult a Licensed Electrical Contractor.
Locate An Electrical Contractor in Your Area
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Be Careful and Be Safe - Never Work on Energized Circuits!
Consult your Local Building Department about Permits and Inspections for all Electric Wiring Projects.
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