sizing

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  1. 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...
  2. 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...
  3. 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...
  4. 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...
  5. J

    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...
  6. 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...
    • PlinthAdenoid
    • Thread
    • 3 phase generator phase sizing wales
    • Replies: 13
    • Forum: DIY Electrical Advice
  7. Rockingit

    NYY-J sizing

    Just speccing a job for tomorrow - simple 3ph immersion supply at 12kW. Supply to be constantly on, using the immersion temp stat for control (by request....) via a local isolator. (Have suggested future improvements with timers, stats, contactors etc but for now it's just this) So that's...
  8. V

    sizing neutral on a split phase 180 deg

    Hi, looking at installing a sub main down to a field to supply caravan hook up points. the supplier has stated they are installing 2 x 100 amp split phase 180 degrees apart. not worked on 460v/480v split phase - my question is how do i go about sizing the neutral. i plan to run a steel wire...
  9. G

    Cable sizing

    Hi Can somebody help me with this please Looking at the table in OSG. It states if I'm reading it right. That the ratings apply to insulation with thermal conductivity greater than (^)0.04 Wm-1K-1 So if 0.039 W/M2K = thermafloc loose 0.044 W/M2K= superglass 0.035 W/M2K= Rock...
  10. V

    Sizing csa of old cable

    Hi Looking at an old 3036 board and 2 peak and off peak immersion supplies. The cable looks like it is in between a 1.5 and 2.5. It is fused with a 15 amp fusewire. I know some old cabling is imperial but was this a regular thing for a batch of cable in the 70/80s???
  11. F

    SWA sizing for sub boards

    Hi guys, I'm working in a new role which requires me to size SWA cable to feed sub boards which in turn supply EV chargers. I noticed on the jobs that have been done already they have used 50mm 4c and 70mm 4c to feed 3ph 250A main switches on the sub boards. Going by tables and calculators this...
  12. J

    MCB sizing

    Is there any issues in having 10amp breaker if the circuit is pulling just under 6 amps? I know the breakers there to protect the cable and the cable is 2.5 3 core armour. Just curious.
  13. A

    Cable sizing for 50kW windmill ?

    Hello, I'm not an electrician. I'm looking for advice on the capacity of an existing SWA cable I have on a farm. It's a three phase cable (red,yellow,blue) and black neutral which connects an old 18kW wind turbine back to the farm electrical substation. I think each cable core is 10mm2 but it...
    • astrosparks
    • Thread
    • cable cable sizing sizing
    • Replies: 5
    • Forum: UK Electrical Forum
  14. C

    how to work out what size commando plug I need.

    Hello. It has been a long time since circuit designing for me as I am a simple maintenance person. How do I work out commando plug sizing, for example a machine rated at 32A, plus I have several machine that need moving onto one board, I have there rated current how do I work out board size...
    • chris1983
    • Thread
    • circuit commando design electrical work having how to out plug since size sizing work
    • Replies: 6
    • Forum: Electrical Engineering Chat
  15. L

    Sizing 3 phase Generator

    Hi Everyone May be someone could shed some insight on the sizing and provide some suggestions: 3 phase Generators (400 V, 50 Hz) have the ability to sustain 250% kVA of its rated kVA at 30% voltage dip. Suppose a machine needs to be powered by a standby generator during a power outage. It...
    • Locus
    • Thread
    • 3 phase generator phase sizing
    • Replies: 4
    • Forum: UK Electrical Forum
  16. C

    Twin and Earth CPC

    IEC 60364-5-54 states that phase conductors 16mm2 and smaller require a CPC of the same size, over 16 to 35mm2 a 16mm2 CPC and over 35mm2 a half size CPC is required. My questions is why am I seeing catalogs with harmonized twin and earth with reduced size CPCs over 2.5mm2? And why doesn't the...
    • Cookie
    • Thread
    • and earth cpc earth sizing twin twin and earth
    • Replies: 139
    • Forum: UK Electrical Forum
  17. Pretty Mouth

    Why are main protective bonding conductors sized as they are

    Hi all. Hope you are all well and virus-free. This question is not how to select main protective bonding conductor sizes according to the regulations. That I understand how to do. What I am asking is: Why do the regulations require such a large CSA for Main Protective Bonding conductors...
  18. M

    Cable Sizing for Oven...?? Please Help..!!

    Morning.... I was wondering if you guys could help me with this..?! I’m currently having my kitchen updated, including all new appliances... The oven, according to the manufacturers documentation has a rating of 4.2kw, which is 2.2kw or the oven and 2.2kw for the grill... The paperwork states...
    • mgzr
    • Thread
    • cable cable sizing oven please sizing
    • Replies: 5
    • Forum: UK Electrical Forum
  19. M

    Sizing MPCB

    Hi guys, just making sure that I'll be choosing the right size of MPCB, motor connected in star with current 3.32A, would a MPCB rated at 4A - 6.3A be good enough? Thanks!
  20. J

    MPPT Solar Charge Controller Sizing for 1200 Watt solar Array

    Hey everyone! I am drafting out my first solar power off grid system for my back yard shed and came here in hope to get some good recommendations from you guys on trusted a charge controller which will support my current specs but also give me room to grow as I improve on this system. Below are...

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