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  1. S

    Cable calculation

    No but in terms of over current in a domestic dwelling ive seen a db have 100amp main switchbwith and the main head bein 60amp fuse, the fuse in the main head would blow before rhe main switch would trip. Which is incorrect but why is this done.
  2. S

    Cable calculation

    I dont have one as the customer doesnt exactly know what he is having, i was going with the worst case being the fuse rating on the main head. No utilities as its pvc water main. And main earth will be tt as its in a field, western power have put a tncs in but we will be putting a earth rod in...
  3. S

    Cable calculation

    Yeah im now thinking degrade the fuse rating in my isolator, going off topic how do this work in domestic when the heas is a 60amp but the mainswitch on a db is 100amp
  4. S

    Cable calculation

    Yeah however he may be adding at later dates i know all the lighgs will be led tho and its literally gonna be 13 amp sockets, so in terms of circuits, 4 lighying and 2 or 3 radials maybe, the circuits again will be a good run in armoured so il also be cable calculating these but this wont be a...
  5. S

    Cable calculation

    Yeah however he may be adding at later dates i know all the lighgs will be led tho and its literally gonna be 13 amp sockets, so in terms of circuits, 4 lighying and 2 or 3 radials maybe, the circuits again will be a good run in armoured so il also be cable calculating these but this wont be a...
  6. S

    Cable calculation

    70 degree mate,
  7. S

    Cable calculation

    I dont know the design current so im taking it as 80amps, as thats is the fuse rating on the head.
  8. S

    Cable calculation

    In what way.
  9. S

    Cable calculation

    Il give you the scenario, stables in a field, e-on have been out and put a supply in a hut with a meter on and a one shot, main fuse is 80amps, the customer need a fuseboard putting in the barn, 75metres away, what size cable would i be looking at, ive done a calculation, 1 x swa cable 3 core...
  10. S

    Flourescent

    Would this imply that a twin fittings output would be 12,000 -13,000 lumens in total then, 6000-6500 per lamp?
  11. S

    Flourescent

    Is there a rule of thumb in terms of max wattage on 1.5mm cable Or how do you work out the inrush current? What if the inrush current surpasses the max current rating of the fixed wiring? Is this ok because it's only starting current?
  12. S

    Flourescent

    Is there a rule of thumb in terms of max wattage on 1.5mm cable Or how do you work out the inrush current? What if the inrush current surpasses the max current rating of the fixed wiring? Is this ok because it's only starting current?
  13. S

    Flourescent

    I have been asked to change alot of old twin 6ft flourescent fittings in some units, twin 70watts. The new ones will be led, just wondering what the equivalent would be to give off the same brightness. I've seen some 6ft led twins that say 70watts but won't that be to bright as they will be led.
  14. S

    Choosing the correct ballast?

    Well I did look into this and the 4ft lamps are around 1215mm in length, wouldn't this be to big for the 1200mm x 600mm module? Well the guy has changed the lamps he said and the starters and still doesn't work. Can only assume it's will be the ballast, there are 2 ballasts as you said 2 lamps...
  15. S

    Choosing the correct ballast?

    No it's not awkward to do just couldn't gain access at the time on inspection, I see what your saying but he has lots of light in his office, so and this would stand out unless I changed them all, I know he wouldn't want to go down that route, just looking for the ballast really that would be...
  16. S

    Choosing the correct ballast?

    I have a job to repair a light in office, 1200x600 grid tile fitting, I am under the impression it's the ballast that has gone, I couldn't get access to the fitting at the time but believe the lamps to T8 lamps 4x 30w (3ft) what ballast would I need for this??? Assuming it's the old magnetic...
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