capacity

  1. L

    Type B MCB tripping at higher current rate than cable capacity

    Can someone please explain me how type B MCB can protect a cable if it only trips when current is 3-5 times maximum load? Let's say, 2.5mm radial circuit is protected by 16A type B MCB. Prysmian 2.5mm T&E current rating is 27A. How will 16A MCB protect the cable from overheating and burning if...
  2. Charlie_Don't_Surf

    Steel conduit maximum capacity for 90 degree thermosetting cables

    Hi, as part of a project for my level 3 C&G 2365 course, we need to provide power to a number of 230v single phase socket outlets on a ring final circuit for a workshop area within a building designed for light industrial work. The considerations about current carrying capacity and other...
  3. I

    Can anyone give me the answer and source for this question on current carrying capacity

    Hello I just need to know the correct order and a source which shows me that it is that order please When calculating the current carrying capacity Is the correct order Ib ≤ In ≤ It ≤ Iz Or Ib ≤ In ≤ Iz ≤ It Niceone
  4. F

    Basement sub-panel wire requirements

    I’m running wires to the basement for future basement finishing. I’d like to add two circuits of outlets (one on the finished side and one on the unfinished side of the basement), baseboard heaters (I’m also open to other heating options, the basement stays in the low 60’s in the winter, so I...
  5. A

    Cable Current Capacity - Solar Inverter vs Normal Loads

    Hi,first off this does not relate to work I intend to DIY. I'm trying to sanity check information I've been asked to provide to the installers. I want the solar invertert to connect in the garage, where there's a DB fed from the house via SWA. This is what's asked .. As the proposed PV...
  6. B

    Single and three phase current capacity and voltage drop differences.

    Hi All, From what I understand, working out the design current - Ib for single phase is quite easy (max appliance power/voltage). For three phase, do I take the max power, divide by 3 then divide by 230 to get the Ib? (We definitely use 230V for everything right?) Now for voltage drop, We...
  7. J

    EV ultra cable, current carrying capacity

    Hi Doncaster EV ultra cable: Does anyone know what the current capacity of these cables is given particular reference methods? The spec sheet just says 'Max current' 45amps (for the 4mm) but it doesn't state the reference method. The manufacturer does have a very handy cable calculator...
  8. L

    Breaking capacity of MCBs

    Hi all, I have a question regarding the breaking capacity of circuit protective devices. So, the breaking capacity rating of devices in domestic / 230v tends to be 6ka, and for commercial / 3 phase it tends to be 10ka. Say the PFC at the origin was greater than the rating on the MCBs, and the...
  9. B

    question about battery capacity

    I have a electric wheelchair that is 24V 55AH (12 55AH X 2 in series). i have 2 X 12V 45AH that i want to add to it. what is the best way to add them to the circuit. please explain to me why the way you suggest, is the best?
  10. C

    IDENTIFY THE CAPACITY OF MY MAINS SUPPLY CUT-OUT FUSE (PLUS...)

    About 15 years ago, after having had a modern consumer unit fitted, and prompted by our electrician, I asked my then energy supplier (Tonik) if our 1968 60 Amp cut-out fuse could be upgraded to 100 Amps, and what additional work/expense would be needed. I did not know that my request had gone...
  11. S

    Grid-Tie Inverter Question - Adding Solar Capacity...

    Good Morning All! Always appreciate reading the great ideas and conversations in the forums, and now actually have a chance to ask a question! We’ve got an existing PV system for our house which was installed by a local Solar company. System today looks like: 34x LG335 Panels Enphase iQ7 Micro...
  12. C

    Combining cables to increase current capacity?

    I have a problem and I think I have a solution but wanted to throw it out there to check it is acceptable.. First floor flat with two fuseboards - 1 24hr and 1 Night time economy. The boards are being supplied by two armoured cables coming from separate isolators/meters (60A) from the ground...
  13. P

    Can anyone confirm the breaking capacity of this?

    Hi, Interested in the breaking capacity of this fuse... 4kA? Anyone know for sure? Thanks
  14. F

    Does adding a wifi enabled switch impact wiring in box capacity?

    Hi all: total diyer here. First post. I have a four gang switch box (15 amp). I want to replace three standard switches with three wifi enabled switches but am concerned that I have to put in an increased sized four gang box due to capacity limitations on this standard size four gang box that...
    • Fsmith527
    • Thread
    • adding box capacity impact screwfix switch wifi wifi switch wiring wiringadvice
    • Replies: 0
    • Forum: UK Electrical Forum
  15. S

    PVC vs Galvanised Conduit: Current Capacity Enclosed In a Thermally Insulating Wall?

    Is there any advantage from the perspective of current ratings/de-ratings of using galvanised round conduit over same size PVC conduit? With both to be chased/buried in brick wall and plastered over? If so, where is this specified? Cheers
  16. R

    Commercial kitchen from home

    Hi, I'd be getting an electrician to complete any work but would still like an idea first on what is and isn't possible and the best way of going about it. In a nutshell, we are looking at converting the spare area of our dining room into a mini-commercial kitchen by mainly using electrical...
  17. S

    Capacity on ring main

    Hi, I'm a DIY'er, new to this forum. My situation is, I'm laying a new kitchen ring circuit for my sister. The ring will supply the obvious kitchen appliances including 3kW oven, fan, washing machine, dishwasher, f/f, microwave, toaster, kettle, plus an elec fire at the far end. Potentially an...
  18. A

    What is the panelboard capacity (V & A) for 7-eleven type convenience stores, w and w/o gas station?

    Would like to know typical voltage and amps for the main service of 7-eleven style stores, with and without accompanying gas station?
  19. Adam_92

    breaking capacity of overcurrent devices

    I’m wondering if someone can tell me in the OSG or regs that it has the short circuit breaking capacity of overcurrent devices someone said it was table 7.2A but can’t find it anywhere
  20. HoverSPRX

    Max Demand/Diversity Query

    Hello All, Iv been asked to pick up the remedials on someone else's EICR that was done last year on a school for Deaf Children. One of the items listed on the report is the conductors leading to the sub mains from the main panel are undersized. I popped the cover off to have a look and sure...

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