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Discuss What power rating would this garage door be? in the Electrical Forum area at ElectrciansForums.co.uk.

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  1. happyhippydad
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    happyhippydad Member Electrician's Arms

    Location:
    Gloucestershire
    I have a roller garage door that my friend has fitted which i've noticed is connected to a socket to give it power, but then has a flood light attached to the control panel which is also connected to the lighting circuit. In other words you need to isolate sockets and lights to make sure the control panel is properly isolated.

    I would like to put this garage door on the lighting circuit. I have rang the garage door company and they said that the power was 8W so clearly they have no idea. It is a galvanised door approx 3m x 3m. Direct drive.

    Does anyone have a rough idea of what power these types of motors would be?

    Cheers in advance :)
     
  2. telectrix
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    telectrix Scouser and Proud of It Respected Member

    Top Poster Of Month

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    look on the motor. it should have a rating plate. it will be a FHP motor so will be under 5A, should be OK on the lighting circuit unless the start surge requres a type C breaker.
     
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  3. Pete999
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    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    Fit a FCU to the socket and feed the lo from that.
     
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  4. ruston
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    ruston Respected Member

    Location:
    Northumberland
    Clamp the motor on start up and see what it draws.
     
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  5. westward10
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    westward10 In echoed steps I walk across an empty dream. Staff Member Moderator

    Location:
    Northamptonshire
    If the lighting circuit is wired using 1.0 cables then it is inadequate for a power circuit. See Table 52.3
     
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  6. telectrix
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    telectrix Scouser and Proud of It Respected Member

    Top Poster Of Month

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    i think pete's solution is the best.
     
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  7. Sparkyboy
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    Sparkyboy New EF Member

    Location:
    Norfolk
    You should fit a FCU fed from the socket fitted with a 5A fuse, I recently wired a garage with two roller shutter doors.
     
  8. Pete999
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    Pete999 Forum Mentor

    Location:
    Northampton
    Business Name:
    None
    See post three
     
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  9. Spoon
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    Spoon Forum Mentor

    Location:
    Lancashire
    I'm with @Pete999@Pete999 post #3.
    Out of curiosity, what size fuse is in the plug?
    You would get one of these that could tell you how much it is drawing?
     
  10. Lucien Nunes
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    Lucien Nunes Mercury Arc Rectifier Respected Member

    Location:
    London
    Electrical behaviour and starting load will depend on whether it's an AC or DC motor as both are used, screw or chain drive, and on how well the door is counterweighted. I would expect it to be in the range of 250-500W when running, but would allow 1kW / 5A for starting. Why do you want to run it from the lighting circuit?
     
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  11. happyhippydad
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    happyhippydad Member Electrician's Arms

    Location:
    Gloucestershire
    At present the control panel is fed from a socket. In the control panel there are terminals for a light to be wired into it, which it has. This light is also connected to the lighting circuit (so even if the sockets were off the S/L in the control panel could become live if the light was switched on). It would be a right hassle to take the light out of the lighting circuit, so I thought to put the garage door on the lighting circuit so it can be isolated correctly.
     
  12. Lucien Nunes
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    Lucien Nunes Mercury Arc Rectifier Respected Member

    Location:
    London
    Are you saying it is energising the light (that is part of the lighting circuit) from the line obtained via the plug, or just that it closes an electrically separate contact in parallel with the light switch to operate the light? The former case is wrong and needs to be fixed as the two circuits are not electrically separate - in theory the plug pins could become live too, from the lighting circuit. If the cable run to the light or switch can have PL and SL connected, then this problem can be solved with a small relay in the panel.

    The latter case is electrically fine, merely needs a label on the front identifying the two sources of supply. You would need to isolate the lighting circuit anyway so pulling out the plug is hardly an extra complication. I know it's not so common in domestic situations but in industrial plant it's quite normal to have multiple circuits within a panel.
     
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  13. happyhippydad
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    happyhippydad Member Electrician's Arms

    Location:
    Gloucestershire
    This is what I have Lucien...
    garage door.jpeg
     
  14. ipf
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    ipf Forum Mentor

    From what I can make out, you have two supplies at the dp switch. Needs a couple of relays controlling the light, one for manual and one for the sensor, I'd say.
     
  15. Lucien Nunes
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    Lucien Nunes Mercury Arc Rectifier Respected Member

    Location:
    London
    That looks very naughty! It's tying the two circuits together and could make the plug live. Where you have a DP switch, replace with one SPST relay with 230V AC coil and 5A rated contacts. Connect the coil to the 'lamp output' from the door opener, and the contacts between the two SL's (lamp direct and via sensor) No wiring alterations needed. Observe electrical separation between the coil circuit and the contacts.

    The door opener will however only energise the light when the PIR sensor is also enabled at the 2g switch. If you want the opener to have independent control of the light, you will need to get a PL to the relay from the 2g switch, I don't know if that's adjacent or distant. Optionally bypass the DP switch and put the relay adjacent to the 2g switch.
     
    Last edited: Feb 9, 2019
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