sizing

  1. A

    Cable sizing calculation

    Happy New Year all. Quick question regarding cable sizing. I have a 25m run from DB to car charging unit. The 25m run will mean approx 8m is run in the attic, 6m is run clipped direct down and across a wall and the remaining 10-11m will be buried underground in a 2 inch duct to the car charging...
  2. D

    Correct MCB sizing or not

    Hi, I recently discovered at my brother in laws that he has a circuit which feeds a outbuilding, but we also discovered that it’s attached to a small part of the downstairs sockets towards the rear of the house! The concern is this outbuilding then goes on to feed another small shed.. is this...
  3. F

    Earthing and Bonding sizing.

    Morning All, Think I'm having a brain fart but I have a 70mm2 4 core SWA with a separate 35mm2 CPC. Earthing is TNS with main bonding requirements being 25mm2. Using table 54.7 - CPC is half of line conductor so 35mm2. Am I correct in thinking the 35mm2 conductor is adequate for both CPC and...
  4. dcg4403

    480V 3PH Neutral Wire Sizing

    Greetings, I'm a EE and have installed many electrical systems but am now dealing with my first large 3PH install on our property. I'm not formally trained in this area but very familiar as a EE. Anyway, can someone help me with proper neutral wire sizing? I've done a bunch of research...
  5. B

    Some cable sizing questions! :)

    Hi All I would appreciate some help with a few questions here regarding cables sizing, I'm using the latest 18th edition, amendment 2. Q1. p.443, Table 4CQ - derating factors for groups cables - in the table it states "cables touching" but then Note 2 says "horizontal clearances between...
  6. GeoffatMM

    Three Phase Cable Sizing

    I am an enthusiastic retired engineer rebuilding a barn in France from scratch and am having problems sizing my incoming electrical cables. I have had answers from 4mm to 50mm cross section from various pages on the internet so you can understand I am a bit confused. There are two main cables...
  7. R

    New solar installation - cable sizing and no cables for battery installation...

    So, I already have solar (an older FITS installation) and it's been particularly successful so I want to extend this. I'd like to do two things at this point. 1) Add more panels in a couple of locations. 2) Add battery storage to provide some backup (power regularly drops for us) but mainly to...
  8. W

    Sanity Check and Cable Sizing: Adding RV Subpanel

    Hi folks, I have been researching the NEC and forums on the Internet in preparation for adding an RV subpanel electrical hookup. I could use a sanity check to make sure that I'm buying the right type of cable(s), and that I'm adhering to code as best I can. I have 200a service to my main...
  9. A

    SWA banjo fly lead size

    Hi all. Could I ask some advice please regarding SWA banjo fly lead sizing. Can anyone explain what sizing or how you size the required earth size when: A) The armourings are not used as cpc B) When armourings are used as CPC? I’m still learning and can’t find anything explain I guess this...
  10. M

    Circuit breaker rate sizing

    Hi all I would like to know what should be the rating of Air Circuit Breaker to select for a Genset based on the following data: 2000k VA PF 0.8 1600k W load connected to the Genset via dedicated busduct. Supply: 415 V I have an idean in mind (whether right or wrong) but I would like you to...
  11. D

    USA Running new circuit to AC unit, please review my plan.

    Running a new circuit to an AC unit, making sure I'm on the right track. The attached chart has the information for this unit which is on column 4. Maximum overcurrent protection: 30 amps Minimum circuit ampacity: 19amps 240 volts It will be running across a rooftop in a pretty hot location...
  12. bigspark17

    Solar Array swa sizing

    Any help on solar array swa sizing? 4kw array needed around 20M swa from house to array. thanks
  13. T

    Oval conduit fill sizing

    Running some cables and fitting some back boxes to save some money in preparation for an electrician to do a 1st fix. Just wondering if there is a simple table available to show what size cable(s) will fit into oval conduit? Specifically 2 x 6mm2 T+E cables (induction hob and oven) and 2 x 4mm2...
  14. F

    Generator sizing help

    Hi all. I've been out to look at a mates new (to him) air compressor. It's 15kw 3phase star-delta run. He's off grid and currently has a 20kVa Genny running his farm. This is obviously undersized for starting the compressor, when tried the Genny bogs down and contactors start chattering. He's...
  15. D

    sizing up mcb and a contactor

    I have a servo drive that is rated 10AMP. It then has a second rating refered to as it's Peak current : 30AMP 1) Do you size a MCB using the Peak current rating or the standard rating? 2) Again when choosing a contactor would you go for one closest to it's peak current rating or standard...
  16. N

    PV Solar Sizing Question

    Hi, I'm after some advice, I've got space on my south facing roof for between 18-20 panels, but every installer I've been too is recommending that I limit the number of panels and install a 3.5Kw Inverter so that the DNO can be completed post installation, they all seem to have a reluctance to...
  17. F

    Cable sizing for camping pods

    Hi all, I know it's hard to tell without seeing a job but, we're wanting to put some camping pods in at one of our sites. We're only looking at basic electrics, LED lighting and a couple of sockets for phone charging but no heaters as they won't be used all year round. We considered 16A caravan...
  18. H

    Is there a formula for sizing the amps needed for a breaker?

    HI, I have a small shop space with single phase run to a 100amp breaker main, and I bought a few items such as a welder, plasma cutter and a compressor. In order to ensure I select the correct breaker for these devices and any other ones in the future, I was wonder if there is a formula or...
  19. J

    USA Sizing a propane standby generator

    I have a well pump and motor on it's own meter. I do not have the specs on the motor. It pulls up from about 60' down, at about 45 gpm. And my bill is for about 800 kWh per month. The coop utility power goes out periodically and we want to have a propane generator that I can use to keep my...
  20. P

    Sizing and renting a 3 phase generator in Wales (in the UK)

    Hello everyone, I really hope this isn't an idiot question but boy, I'm out of my depth! I've spent about 3 weeks (not solid mind) trying to work out how to size a generator to power a lathe for a test. Situation is, I'm buying a house in Wales (UK) with a restored lathe in it. It's 3 phase...

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