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formula

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  1. Y

    Voltage drop question

    Hi everybody. I have a question (still learning, passed 17th edition and part P, but I'm not yet registered). If you use formula from On-Site Guide p.140 what the design current you put in the formula, to calculate max length of cable for 11.5V. If 32amp then the maximum length of ring final...
  2. T

    high Zs on 110v

    hi all, In a bit of a pickle ,got niceic audit imminent ,and i have some exccesive readings from a 110v transformer backed up by 60898 type c 16amps mcb acording to BS7671 pg 61 41.6 max is 0.34 .can change to a type B to get max 0.69. these reading s are from another tester ,who...
  3. S

    Formula 1

    Good Evening All, After the display at the weekend in the Gran Prix and team orders I find it difficult to understand how if a driver does or does not pass another car under the instruction of his team management when it is within his capabilities how this is not construed as 'Match Rigging'...
  4. A

    2330 Level 2 & 3 Formula and relationships

    I just thought i would post this here, my symbols sheet to help me revise and remember the formulas.
  5. T

    hi all, anyone got past papers with answers 2330 302 - formula thread where to post?

    Hi all, has anyone got any past papers /mock question and answers for 2330 -302???? i got an exam mid February so not long left. I been on swindon-massive site however theres not much papers for 302 exam. also searched this forum and all post coming up from 2010. Can anyone help me...
  6. T

    hi everyone - has anyone got formula list for level 2 and 3 please?????????? C&G 2330

    Hi everyone, Currently studying level 3 2330 and struggling with some of the formulas. Having took 4 year out from level 2 to 3, I have forgotten quite a few formulas from level 2 which are creeping into level 3 for eg power factor. I'm in the process of making a formula book which has been...
  7. M

    Looking for part time tutor possibly online help with formula things,,

    Im new on the site and just starting my level 3 2330, i would like to get up to scratch with the formula and need some help. Im in bournemouth please get back to me if anyone local would be willing to help, thanks Max
  8. M

    Transformer formula

    Hi guys. Studying for my 301 and I'm not getting the transformer formula. Vp/Vs = Np/Ns = Is/Ip Then it keeps going on to say we can then transpose this to get.... Vs = Vp x Ns / Np We also get Np = Vp x Ns / Vp How are they using the first formula to get the others? Please help. Thanks...
  9. F

    Adiabatic formula

    Not got my reqs or on site guide with me today could some one explain or show me an example to work out earth size 230v supply ze = 0.12 customer been told about calculation rather than need to upgrade earth system and i cant remember formula or how to do it thanks in advance lads
  10. M

    How can i select my Generator size and as well as its kVA.............?

    HI, all let say.... i have connected load 20,000W = 20kW... I calculate ampere from this formula p=vi(1.732)(0.8) by the help of this formula i got my breaker size...... but i confuse that how would i get my generator size.......? plz help me about that.... thanks advance.......:tounge_smile:
  11. M

    Proof Formula (Please Help)

    Hello Proof This Formula Of Independent stimulation generator proof with Mathematical Please Help Thanks
  12. IQ Electrical

    Formula help for students/trainees

    Here's a little 'Formula Wheel' with some of the more common Power/Voltage/Resistance/Current formulas. Might be handy to keep in the back pocket for anyone learning or forgetting!
  13. T

    problems with one particular formula.

    Hi all I’m in the middle of my level 3 and having problems with one particular formula. The question is: 1.5Kw heater with a resistance of 0.5 ohms. What is the current drawn? Can anyone help me with the formula and some examples please? Thanks Tom
  14. S

    Formula for Zs

    Sat the 17th last night and this question came up, i had a stab at it and i beleive the answer is .....Zs = Ze+R1+R2 however i still cannot find it in the regs book. Can anyone point me to the reg number Cheers
  15. D

    String fuses

    Hi all, Just running through the "Photovoltaics in buildings guide - 2nd edition", as you do, and can't get my head around the string cable requirements. p 16, 2.1.5 says: "For a system of N parallel connected strings, with each formed of M series of connected modules, string cables are to...
  16. Jay Sparks

    Cables in parallel formula

    Hi Guys Quick one for you. A cable that is 25M long and has a resistance of 2.3 m ohms/M ( milli ohms per metre ). A second Identical cable is to installed in parallel with this conductor. What is the total resistance of the two conductors connected in parallel? 1st conductor: 25 x 2.3 =...
  17. L

    Electrical formula sheet

    hi everyone im currently doing my 2330 lv 2 and was wondering if anyone has a sheet with all the formulas on it which would be very helpful thankyou
  18. T

    Voltage drop help please!

    Hi, i am confused about how voltage drop is worked out and need an answer for the following please; Work out cable size and cpc size you need when you have: Cable length = 50 metres Ib = 32Amps to get a voltage drop that complies with regs i.e. below 5%(11.5 Volts). It's wired in singles and...
  19. F

    volt drop?

    hi im struggling with volt drop , the circuit is 6mm 2core swa , run under ground , 220M long ,supplying a transformer charging batterys for a gate system rated at 5A. Can anyone help me and give me the formula for the calculation? Thanks:confused:
  20. S

    Formula Calculations Help!

    Hi Was wandering if someone could help, I'm a first year level 2 student and we have just started calculations and I'm stuck on a couple: 1. Calculate the thickness of an aluminium busbar 60mm by 12m long which has a resistance of .000946 ohms (given that aluminum has a resistivity of 2.84...

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