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factor

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  1. B

    200 x 200 trunking capacity

    What is the maximum cable capacity (factor) for 200 x 200 steel trunking 2metres up the wall with a 90 degree bend three metres along the wall And what is the cable factors for 1.5mm and 2.5mm singles Don't have reference books to hand
  2. S

    X factor

    Anyone know any decent sparks in the London area ? Might be needed on the X Factor to stop all the saddos topping themselves cos its broke :chillpill:
  3. S

    Power Factor Fudger!?!

    Hello. I'm new and I'm not an Electrician. I have just about got my head around why these little plug in power factor correction devices don't work. I was wondering whether a device could be made that does the opposite? i.e. gives you a poorer power factor and thus lower bills. Or have I got a...
  4. L

    RLC Circuits - Phasors

    Hi Guys, Just wondering if anybody would mind explaining the main purpose of working out the lead/lag of current compared to voltage in RLC circuits? Is it to do when selecting/derating cables for current carry capacity? Is there any other things that happen? maybe extra heat build up in...
  5. K

    Please HELP me (POWER FACTOR ISSUE)

    Hi folks, My client have a generator set rated 450KVA, 220Vac, 3P, 60Hz. Recently, the during start up of operation, the generator shut down because of an unknown trouble. When I check the power analyzer (I used for monitoring), the event that caused the shut down was "PF" which means...
  6. K

    Power factor

    Hi folks, My client have a generator set rated 450KVA, 220Vac, 3P, 60Hz. Recently, the during start up of operation, the generator shut down because of an unknown trouble. When I check the power analyzer (I used for monitoring), the event that caused the shut down was "PF" which means, POWER...
  7. S

    Demand Factor 'v' Diversity Factor - which is your preferred method

    Gents, I'm applying for CEng through the CIBSE TRR route, my chosen subject determining maximum demands within commercial properties. I've been reading through some of the previous threads concerning manximum demand calculations and note almost everybody has a completely different approach...
  8. J

    volt drop rule of thumb

    Hi Guys, could anyone explain to me the 1.2 volt drop rule of thumb? i understand the 3% for lighting and 5% for other circuits. any help would be welcome studying for 2391. Thanks in advance.
  9. K

    Generator shutdown

    Hi Folks! Wanna ask some help. I have a KOMATSU Generator with capacity of 350KVA, 220V, 3phase. When I was recording the data from a HOIKI power analyzer, I noticed that sometimes the current reading on the GROUND line reaches to 40Amperes. What could be the cause of that measurement? Before I...
  10. R

    Roof plane factor calculator

    Just though this might be useful to you when you do site surveys. I've got it taped to my clipboard. I have a tape measure rather than a Leica Disto D8 - I want one but £717 is a bit steep for a tape measure! Measure the width of gable end of a building, divide the answer by 2 and multiply it...
  11. J

    Geogrpahic Irradience Factor

    Morning Ive been tasked with working with our web developer to generate our own Feed in Tarrif calculator on our website but have a few questions on the calculations we need to use. Im using the SAP figures (2009) from BRE and the equation 0.8 x kWp x S x Zpv and that is all simple enough to...
  12. S

    Ring Final Circuits & Correction Factors

    Something I've wondered about for a while... If you had both legs of a RFC, in say T&E or singles, running in the same conduit, so basically touching, would you need to apply the appropriate correction factor for grouping?
  13. K

    Full load versus demand factor result

    Hi Engineers, just want to clarify something. I have a computation of Total Full Load Current of 195 Amperes. My client gives me a demand factor of 0.70, multiplied to my Full Load Current 195 Amperes results to 136.5 Amperes. My decision is to use a 200 Amperes Main Breaker, am I right with...
  14. D

    Sizing Factor

    Could someone please explain why the sizing factor is changing when you try to design a system using softwares (such as PVSOL)? what factors the sizing factor depends on? Thanks.
  15. S

    350 KVA HV Transformer? 3 phase calculation confusion

    I need to buy a 3 phase HV transformer for an apartment block 1382 Amps is the total predicted single phase load after diversity. 1 Phase KW 1382 Amps 230 Volts ( I/V) 317.86 KW KW 1 Phase KW to KVA 317.86 KW 0.9 Power factor ( KW x P.F. = KVA) 353 KVA KVA Single Phase to 3...
  16. 1capybara

    Diversity factor for calculating loads ???

    I am a Yank electrician, I cant find where in 16th or 17th edition you have the diversity factor for calculating loads. Example: 1. In one office or sleeping room I put 4 power sockets on a 32 amp ring circuit. We have 100 identical sleeping rooms or offices. What is the total load that we...
  17. I

    conduit factor

    hi have a query re conduit factors hope someone can help. OSG gives values for straight conduit runs between boxes, and values for conduit runs with one or two bends. for example if you have lets say a 1m run to a 20mm elbow box and then a 2m run to a socket outlet. would this run...
  18. T

    3 phase motors ratings

    Hello you clever motor men ive not had a lot to do with motors, what I would like to is if for example a 3 phase motor is quoted as 6kw (forgetting the kva and power factor for a mo) would it normally mean 6kw overall or 6kw per phase ?
  19. G

    Help! What is the correct SAP radiation factor to use for a 15 degree roof?

    OK. Need to get a quote to a customer tonight but hit a snag. The roof has a 15 degree pitch but table H2 doesn't have a radiation figure for anything less than 30 degrees (see below). What figure should I use? What do you use? Table H2 : Annual solar radiation, kWh/m² Tilt of Orientation of...
  20. 2

    space factor

    would 12x4mm single cables in a 25mm conduit exceed allowed sspace factor ?

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