speed

  1. F

    Max wind speed on roof?

    Hey guys can anyone clarify for me the safe working wind speeds for working on roof? All i can find is 17mph but this is for roofers and scaffolders and not specific to PV. Anyone? Thanks in advance :tt1: Fiardor
  2. G

    High/Low Speed 3 Phase Fan Contror???

    Hi I've been asked to move 2 x 3 phase fan control boxes with high and low speed start buttons, stop buttons and LED indicator lamps. They control 2 roof fans. Inside one of the boxes the coil has gone on one of the contactors and needs replacing, but to be honest both boxes are quite old now...
  3. T

    Advice - vary speed of 240v 18w 80mm fan

    Morning everyone! I would really appreciate some advice please. I've bought a small 240v 18w fan to help circulate air in plastic box used for drying food (biltong!) Could someone advise me on the best way to vary the speed of the fan? all the fan controllers I've seen dont seem to work on...
    • TonyChapple
    • Thread
    • 240v advice control dimmer fan motor speed
    • Replies: 7
    • Forum: UK Electrical Forum
  4. D

    generator speed light

    A customer asked me to install a foolproof way of making sure his generator is running at the right speed. The single phase generator is located on a farm and is connected to a tractor by a pto shaft. Previously they set the tractor at around 1000rpm and went and checked that the lights were...
  5. J

    Speed Hump

    Anyone know of any company's where i can purchase a Solid speed hump, that can be fixed to the ground, and conceal a 2.5mm 4core SWA?
    • Jel
    • Thread
    • aus speed
    • Replies: 7
    • Forum: Australia
  6. Dan

    Forum Slow Speed?

    You may notice that the forum lags a little at peak these last few weeks. Basically, we've outgrown our existing server. I ordered a brand new fresh one in November and we've been testing it and configuring it with the lesser important forums since then and we're ready to roll with it. I've...
  7. the pict

    speed controller

    Can anyone reccomend a motor speed controller for a commercial kitchen cooker extractor, nothing fancy, no need for air volume sensors or tacho outputs just a single phase with pot, 16 to 20 A Pict
  8. S

    Petrol generator frequency

    I'm considering buying a used petrol generator but there seems to be some confusion as to what the output frequency is, 50 or 60 Hz. Is there any way of finding out the output frequency of a generator? If it did turn out to be 60 Hz, could it be changed to 50 Hz, and if so, what needs to be...
    • starcott
    • Thread
    • aus engine frequency generator lower petrol rating speed
    • Replies: 10
    • Forum: Australia
  9. K

    High Speed Rail.

    I didn’t want to put this in Chit Chat because I think it’s to important. The HS2 rail link (London / Birmingham) is under threat due to the NIMBY’s as per usual. It may spoil the views around Amersham and go through the constituencies of two Tory MP’s. As to the views, it’s got to be some of...
    • Knobhead
    • Thread
    • aus speed
    • Replies: 10
    • Forum: Australia
  10. M

    Gary Speed

    Someone just emailed me that he past away, possible suicide, what a great shame such a young lad .................whatever RIP
  11. P

    Faster than the speed of light

    http://www.telegraph.co.uk/science/science-news/8901001/Speed-of-light-broken-again-as-scientists-test-neutrino-result.html anyone up for some time travel :) beats going to the moon
  12. L

    Speed Control of Motor using SCR

    Hi, Does anyone know a good link explaining how the circuit shown in the attached document works? It is used to control the speed of motors using Diac and Triac. Many Thanks Leena
  13. 1

    Combo or drill driver

    Hi there looking at getting a new drill not sure if to go for a combi drill or drill driver, please advise me your help appreciated
    • 1sammaskell
    • Thread
    • aus combi combo dewalt drill driver makita speed you've
    • Replies: 5
    • Forum: Australia
  14. T

    Three speed fan control installation

    Hi, I am attempting to fix a friend's 18" pedestal fan, and I can't find which wires go where on the control. The cables were already disconnected when I got the fan. The fan's brand is SilverPoint. I have Red (or Pink), Green, Grey, Yellow, and White cables the come from the motor to the...
    • thehobbit
    • Thread
    • attach aus cables contact control fan installation not uk speed three where
    • Replies: 4
    • Forum: Australia
  15. M

    How do I speed up on site?

    I am really slow when it comes to practical, if I try to go fast I make more mistakes but if I go at my normal pace I'm behind everyone else. I have an the 2330 level 2 practical exam soon, they said that slow people will might not finish in time. I really don't want to resit a very expensive...
    • Mr Curnow
    • Thread
    • aus site plan speed
    • Replies: 33
    • Forum: Australia
  16. M

    too much speed for switches

    Hello everyone I need help if possible I have a revolving disc....outside of this disc on static ground i have a series of switches around the outside of the disc...the disc needs to spin at 1000 rpm. problem...the switches are burning out and melting...and the system is only 12 volt. the...
  17. D

    MVHR Dual Speed Fan Control Problem

    Hi All, Any advice on this topic would be very much appreciated as I have hit a brick wall on this. I am installing a Mechanical Ventilation System into a domestic property, which for those who don't know is basically a whole house ventilation system that takes out stale air and draws in fresh...
  18. K

    Steel trunking

    Hi guys. Have you seen this? http://www.youtube.com/watch?v=owLiV1m2dlQ New Salamandre trunking from Legrand. Is time of the essence when you're on a job? Has anyone tried the new trunking? There is a roadshow going on at the moment where you can try out the new system. Fastest fitter wins...
  19. S

    fans and speed controllers

    been wiring up fans and fan speed controllers today in a commercial kitchen, from the speed controller ther is a 4 core cable up to fan isolator switch then 4 core to the fan ( brown, black and grey + cpc) is there a specific order in which these cable should go in the connections, coloured tape...
  20. W

    speed control question

    hi guys have a question on the speed control of a fan. was told to instal a speed control for a fan. the speed control was varying the voltage off the fan from 230, 110, 80, but i cant understand how a 230 fan would not burn out running on lower voltages and when measuring the amps at different...
    • wolfiehogan
    • Thread
    • aus control question speed
    • Replies: 7
    • Forum: Australia
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