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  1. J

    calculating total consumption for each of the circuits and final maximum demand curre

    I have to calculate the total consumption for each of the circuits and state the final maximum demand current. downstairs :2 fittings with 5x 12w lamps,1 fitting with 5 x 12w 1 fitting with 10 x 12w,1 fitting with 1 x 60w,1 fitting with 7 x 20w 2 fitting with 3 x 20w,1 fitting with 4 x 30w and...
  2. 0

    3 phase cable selection and protective devices

    Hi everyone. I'm after abit of help calculating cables sizes and protective devices for a 3 phase DOL motor. I haven't worked on 3 phase equipment for many years and 3 phase calculations is as far back as college so please excuse my ignorance on the subject and not knowing answers to perhaps...
  3. F

    Total novice

    Hi, i know now absolutely nothing about elect rivals or any diy for that matter. This might sound like a really stupid question, but I bought a throw for my dogs & it covers a double plug socket that had two plugs in it that are permenantly on. Is it safe for the throw to cover the plug socket...
  4. Simonslimline

    Series parallel combination resistance.

    Just spotted this on my facebook feed :juggle2: and thought it may be a good exercise for people to have a go at. What is the total resistance (Rt) of the circuit? :book::)
  5. P

    Calculating total demand and diversity in single phase+three phase circuits.

    Good evening all, I just joined the community and I really hope I can contribute as much as I could be helped. Really. I'm completing my 2365 lvl3 course however I just got my 305 B assessment paper back. Apparently I didn't calculate well the max. Demand and diversity of a given circuit...
  6. G

    Total members that have visited the forum in the last 24 hours: 478

    Total rubbish, I have been on all day today, and there has been less than 30 on line at anyone time, I noticed the names online and I would bet my mortgage no more than 150 members have visited in the last 24 hours, so why does it say 478?
  7. C

    RCD total load vs MCBs

    Hi all again. Enough with helping my friend and back to the main thing, which is back to studying. I am working on my final assessments (practice for my final L3 exam). Big 2 story house with the following requirements (protected devices given accordingly and installation method C, clip...
  8. J

    Additional equipment . Total ASC required

    Hi Guys ? We have been asked to install some additional bits of kit to a small supermarket . Everything is metered ie; lighting , general power refrigeration and so on . We have been told by the consultant that they have an ASC of 60 KVA . I visited site the other day to carry out some...
  9. Resu

    Total Heating Total Control

    Hi all, a question aimed more at my fellow Scottish members, I've recently moved into a flat that is on the above tariff. I am billed two amounts - heating and domestic, obviously with storage heaters and off peak water on lower rate, and power/lights on normal rate. My question is what rate is...
  10. K

    Is 20A double pole switch sufficient for total load rating of two ovens?

    Hi there, I'm installing two ovens, each with a total load rating of 3.5kW. (see details of oven here). The kitchen already has a 20A double pole switch and a 45A dual outlet plate. Is the switch sufficient because I've calculated that the current is likely to exceed 20A? However, I'm not sure...
  11. F

    Total load on distribution board

    Hi im looking for someone to help me understand the total load that can be pull from a dis board. Ie: I have 3phase dis board on a 250amp breaker. The board is filled with mcbs of mixed ratings. However if I add the rating of each MCB together it far exceeds the 250amp breaker on the board...
  12. D Skelton

    Maths - Resistors in series and parallel: Intermediate

    Maths - Resistors in series and parallel: Intermediate
  13. D Skelton

    Maths - Resistors in series and parallel: Advanced

    Maths - Resistors in series and parallel: Advanced
  14. Baker1988

    bit of calculations for the trainees

    Hi everyone i just been looking through my home work from last year and seen a few of my calculation homeworks and thought i would put them up for people to have a go at to try there knowlage. here is a resistance in parallel circuits homework, need to know the total resistance and total...
  15. P

    how do you work out maxium demand

    can you show me how to work out maxium demand on a lighting circuit with ten lights on the circuit please
  16. the pict

    total control

    Just had a customer on the phone asking if I can connect up his total control heaters to its seperate consumer unit, I am going out to it this week, is this a dual tarriff set up as the term is something I thought was wet central heating, sorry if this is a bit vauge Pict
  17. M

    Help with Oven Circuit.

    Have an existing oven circuit 6mm2 twin & earth from the consumer protected by a 32a mcb goes to a cooker control switch, then 6mm2 from the switch was hardwired in to previous oven. Just bought a brand new oven (single oven that fits in cupboard under worktop) specifications are 2.3kW total...
  18. M

    Total load + diversity

    Is there any diversity re overnight circuits when calculating total load. I can see that for shift workers it could be possible to have a shower whilst someone is cooking a roast whilst the storage heaters are demanding juice but.....
  19. R

    fuse question

    hi guys, another question i need some help with. If the supply cut out fuse is a 100 A BS 88-3 device. why is it permissible for the total load to be greater than the main fuse rating? thanks
  20. S

    Socket extension question - max amps

    This has no doubt been asked often by non electrical minded folk like me but when a socket extension says maximum 13amps, does actually that mean 4 plugs fitted with 3amp fuses like desk lamps etc (or 5a+5a+3a) or does it go by the actual amps of the equipment and you could have say 6 plugs with...

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