temperature

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  1. M

    Earth Faulth Loop Impedance HELP!!!

    Hi can somebody shed some light upon correction factors for earth fault loop impedance. I know that the vales of zs in bs 7671 are if the conductors are running at max temp ie worst case scenario , am I right in believing that if you get a measured result you apply 0.8 to it?
  2. F

    Rises In ambient temperature

    I'm not sure if this is posted in the right section but its part if the regs so ill go for it. I have a question on my AM2 exam paper which reads "If an area within an installation undergoes a 10 degrees Celsius rise in ambient temperature, the effect on the current-carrying capacity of cables...
  3. L

    Temperature exponent for series resistance in solar cell model in MATLAB/SIMULINK

    Dear friends, I want to use the solar cell element in SIMULINK but there is a problem. I cannot put my temperature coeeficient for voltage which affects the series resistance in solar cell. In the link below, the parameters of the solar cell which have been used in SIMULINK element are...
  4. S

    Underfloor heating

    Pricing a rewire where they want underfloor heating, through out the whole gaff. This equates to over 70 amps. Is there a simple way to bring to demand down, like some how controlling that the upstairs and downstairs cycle seperatly etc
    • surreysparks
    • Thread
    • diversity don't heating temperature underfloor underfloor heating upstairs
    • Replies: 12
    • Forum: UK Electrical Forum
  5. J

    Ambient temperature

    How do I work out the Ca when the ambient temperature varies from 30 degrees - 40 degree?
  6. R

    Floodlighting temperature problem.

    Hello all, long time no see. Hope everyone's well. I'm quoting for some guy's mansion, basically he wants to all externally lit up from the front, but he doesn't want uplighters or downlighters, he wants floodlights in front of the house to shine onto the walls. Fair enough, but obviously there...
    • rocker
    • Thread
    • lighting problem temperature
    • Replies: 14
    • Forum: UK Electrical Forum
  7. M

    Temperature Indicators on Transformers

    Hey Everyone, Suppose we say the 'Temperature for Alarm is at 90 Degrees C' and the 'Winding Temperature Alarm is at 103 Degrees' on Transformers, At what point of the transformer are we actually getting these readings from. I see RTD's connected to the top of the main tank from the outside...
    • Mustafa Mohd.
    • Thread
    • temperature transformers
    • Replies: 0
    • Forum: UK Electrical Forum
  8. Rockingit

    Ambient temperature for testing and installing cable

    I know we're not supposed to test when it's below around 4degs, but there's this really vague memory at the back of my mind that says I've read somewhere that you're not supposed to install cable either due to the possibility of damage by cold fractures - - - or is this a figment of my imagination?
  9. B

    Solar can heater help

    Hi guys, I want to build a solar pop can heater but a little electrical work is involved and I have no idea what to do so would appreciate any help you can provide. Here is my plan: To build a box around 150 - 180 x 60cm and have some way to put a computer fan in it to blow the air...
  10. C

    Installing an additional room thermostat

    I have a simple central heating system with a traditional Baxi Solo 2 60RS boiler supplying heat to radiators around the house. The room thermostat is located in the main bedroom and so calls for heat only when the temperature in that room requires. When heat is required this thermostat is...
    • csj
    • Thread
    • additional installing room temperature termostat thermostat turned valves
    • Replies: 27
    • Forum: Central Heating Systems
  11. Dic Penderyn

    Honeywell digital eco room stat

    Evening all! Replaced existing thermostat today for one of those Eco stat which I have attached a spec: It is a combi gas heating system (Worscher Bosh) and before I connected new eco thermostat the temperature on combi was working fine at a steady 24C. After replacing old for new the...
  12. seltechpc

    Wireless tank stat with temperature readout

    I am having trouble finding a wireless tank thermostat that gives a remote readout and adjustment. Does anyone know of a company that makes these?
  13. J

    Are there any heating wizards out there? If so, Please Help! Thanks

    Evenin all, Ok, Fairly confident with S plans, Y plans, UFH and the like but today I came accross a wiring situation that I did not understand and had not seen before. Unless I ask someone I'm going to lay awake worrying about it and that just won't do.... I'm basically re-wiring someones...
  14. linuxthefish

    How to wire wall temperature sensor to be on all the time?

    Hi. For the upper floor in my flat, I have a wall temperature sensor with a red and black wire attached to terminals 6 and 7. There are no other terminals in the box. How can I wire this to be on all the time? It only seems to turn the heating on on the upper floors if the temperature gets...
  15. G

    Temperature fluctuation

    From the scientific point of view, why is it important that the solar panels are resistant to temperature fluctuations?
  16. B

    High temperature bulb fitting

    Hi Guys, I'm hoping you can help. I've bought in some ceramic heat bulbs in from China that are slimmer than the ones already on the market. I have them in 60, 100 and 150W, however after testing at full heat the 150W especially appears to be burning the inside of the ceramic fitting. It's the...
    • bergentrude
    • Thread
    • bulb fitting temperature
    • Replies: 5
    • Forum: UK Electrical Forum
  17. L

    Help with equations and college work needed

    Hey guys, iam looking for help on the question below! Q) A 12mm² cable with 90C thermosetting rubbers is to be used in conjunction with lighting, small power, data and fire alarm installations. It is protected by a 40A fuse to BS 88 part 2 in an installation where the loop impedance between...
    • Luke123
    • Thread
    • college electrical work needed phase something temperature
    • Replies: 9
    • Forum: UK Electrical Forum
  18. S

    Inverter Temperature Derating

    As this was the hottest day of the year, I expected a high yield but was slightly disappointed. Having checked the inverter, it was the first time I had heard the fan on. My system is a 3.75kWp (due south on the south coast with 15 x 250w Sanyo panels with an SMA SB 4000TL) with a loft mounted...
  19. B

    Industrial Oven

    I've got an industrial oven 100amps over three phases. I had an electrician wire it up (charged me £900! it took 5 hours and there were two of them!) and it works. The electrician then said as they were packing up, that it was surging. It pulled 97 amps when switched on, then when it gets up to...
  20. J

    PV Switch

    I am successively running a PV switch to switch spare electricity away from the grid to our immersion in a solar thermal 210 ltr tank. As its working very well I'm looking to install a 125 ltr pre heat tank to feed the main tank. Anybody have any ideas on a circuit to sense the main immersion...

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