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Thread: MASTER OVERRIDE SWITCH

  1. #21
    Join Date
    May 2005
    Location
    Richmond, Virginia
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    22,277
    To repeat myself, use a 3-way and a single-pole switch like this:

    Time clock fed always hot to maintain time setting. Connect load (contactor) to common terminal of 3-way. One traveler terminal to clock output, other traveler terminal to one terminal of SP switch. Other terminal of SP switch to always-hot terminal feeding clock. 3-way switch marked Auto/Manual, SP switch marked Manual On/Off.

    Another option is a center-off single-pole switch, connected as 3-way above without SP switch: common to load, second terminal to clock output, third terminal to always hot.
    Code references based on 2005 NEC
    Larry B. Fine
    Master Electrician
    Electrical Contractor
    Richmond, VA

  2. #22
    Join Date
    Feb 2009
    Location
    Durango, CO, 10 h 20 min without traffic from winged horses.
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    Quote Originally Posted by LarryFine View Post
    To repeat myself, use a 3-way and a single-pole switch like this:

    Time clock fed always hot to maintain time setting. Connect load (contactor) to common terminal of 3-way. One traveler terminal to clock output, other traveler terminal to one terminal of SP switch. Other terminal of SP switch to always-hot terminal feeding clock. 3-way switch marked Auto/Manual, SP switch marked Manual On/Off.

    Another option is a center-off single-pole switch, connected as 3-way above without SP switch: common to load, second terminal to clock output, third terminal to always hot.
    If you go and decide to dance with a gorilla the dance ain't over till the gorilla decides it's over.

  3. #23
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    Quote Originally Posted by LarryFine View Post
    To repeat myself, use a 3-way and a single-pole switch like this:

    Time clock fed always hot to maintain time setting. Connect load (contactor) to common terminal of 3-way. One traveler terminal to clock output, other traveler terminal to one terminal of SP switch. Other terminal of SP switch to always-hot terminal feeding clock. 3-way switch marked Auto/Manual, SP switch marked Manual On/Off.

    Another option is a center-off single-pole switch, connected as 3-way above without SP switch: common to load, second terminal to clock output, third terminal to always hot.
    Quote Originally Posted by ActionDave View Post


    Gotta one up the darn cat.
    "Electricity is really just organized lightning." George Carlin


    Derek

  4. #24
    Join Date
    Feb 2018
    Location
    iowa, usa
    Posts
    89
    Jamesco said:
    Just parallel the contacts from this across the contacts of the time clock.

    Add. The manual timer eliminates the chance of human error.


    Quote Originally Posted by GoldDigger View Post
    That gives you override ON, but the OP also wants override OFF for off schedule days/times the building is not in use.
    Add a second such timer with NC instead of NO and put it in series with the time clock contacts?

    Sent from my XT1585 using Tapatalk
    The spst switch would be installed in the circuit before the contactor/s coil. The switch is the gate keeper. Nothing gets past it, when it's in the open position.

  5. #25
    Join Date
    Apr 2008
    Location
    Ann Arbor, Michigan
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    6,588
    180222-1337 EST

    Jamesco:

    Your suggestion of a manually set timer of limited total duration "ORed" (in parallel) with the time of day timer output contact is a very good idea. Combine this with GoldDigger's suggestion of a 7 day timer and probably most of what Casualsparky wants is achieved even though he has not yet adequately defined what he wants.

    .

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