sizing

sizing

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  1. R

    UK Level 3. Cable sizing.

    Just started Level 3 C&G and we're doing cable sizing calcs. Using a previous years exam question. We ran through a few examples of radial circuits, all well and good. Following the following proceedure: Work out total load on circuit from plan. Work out design current. Ib. Ib<In<It Find...
  2. T

    Cable sizing

    Hi all, I am trying to calculate a SWA 4 core that will be protected by a 250 amp switched fuse isolator. It is going to supply a 3 phase electric boiler that pulls 209 amps each phase at most. I'm filling in the parameters to an online cable calculator ,when asked for the voltage i've put 400...
  3. 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...
  4. 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...
  5. 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...
  6. 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...
  7. 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...
  8. 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...
  9. 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...
  10. Deckotah

    2365 Design Drawing Breaker Sizing

    Hi, I am finishing up my design drawing for submission. I am working out all my circuit calculations and am a bit confused about what size I should use for my circuits which are supplies for my additional Distribution Boards ( Hotel, Pool, Summerhouse etc ). My hotel DB however even when...
  11. 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...
  12. 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...
  13. 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...
  14. D

    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...
  15. bigspark17

    Solar Array swa sizing

    Any help on solar array swa sizing? 4kw array needed around 20M swa from house to array. thanks
  16. 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...
  17. 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...
  18. 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...
  19. 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...
  20. 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...

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