capacity

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  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...
    • Luka
    • Thread
    • cable capacity current higher mcb tripping type type b
    • Replies: 9
    • Forum: UK Electrical Forum
  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. T

    UK Change in current capacity along run

    Hi, I have a book on domestic wiring which says that everywhere there is a change in current carrying capacity along a circuit there must be some kind of protection (fused spur etc). Suppose I need to run above an insulated ceiling (reference method 101) and then down a wall (reference method...
  5. 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...
  6. tony9i9i9i

    6242B Current Carrying Capacity and Volt Drop /A/m

    Hi, go easy on me please, I've just returned to the trade, well I am about to, I received my Gold Card last Thursday. I've been gen'ing up for a couple of weeks going through the regs book, watching some fantastic youtube videos, and working through cable calcs and looking at products and...
  7. E

    Electricity supply - Maximum Capacity of Connection 18 kVA

    Hello everyone! I have a question regarding the electricity supply and the maximum demand. One energy utility supplies an 18 kVA maximum capacity of electricity for a three-phase connection, and I'm wondering what this means in terms of the appliances and equipment I can safely use without...
  8. S

    UK DNO Concentric cable current carrying capacity

    Had UKPN come out to a property recently to upgrade the main fuse from 60A to 100A but when they arrived they said that the supply cable which he confirmed is a 25sq.mm. CNE aluminium concentric cable (1-phase, burried) for the PME supply is only able to take a 80A fuse. They will have to dig...
  9. F

    Designing an Electrical Panel with Brum Solution - Busbar Capacity Query

    I need to design an electrical panel, and the main circuit breaker is rated at 250 A. We are implementing a 100% Brum solution for the panel, but Brum's earth and neutral busbars are rated up to 125 A. If I require 20 earth poles, can I use two 10-pole busbars rated at 125 A each? Or does each...
  10. 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...
    • bbudding
    • Thread
    • capacity current phase single three three phase voltage voltage drop
    • Replies: 7
    • Forum: UK Electrical Forum
  11. 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...
  12. 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...
  13. S

    Current carrying capacity of sy cable ran in pvc conduit

    Hi Guys Any one know the current carrying capacity of a 4mm 3 core single phase sy cable ran in a 20mm pvc conduit? Not sure of the right table to check Thanks
    • sparky1888
    • Thread
    • cable capacity carrying conduit current current carrying capacity pvc sy cable
    • Replies: 2
    • Forum: UK Electrical Forum
  14. 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...
  15. E

    Will replacement panels of same total capacity jeopardise FiT payments

    Hi all, as per the above title. If one is to replace the existing solar pv panels for a new system of equal capacity (existing system is 8 x 250w=2000w total) with 5 x 400w=2000w in total, will that risk jeopardising FiT payments. By doing that it would give enough room to add 4 more panels of...
  16. J

    Tri rated cable current carrying capacity

    I have a 37KW motor and need to replace some burnt out 35mm2 tri rated cable(loose connection). I’ve looked at 25mm2 Tri rated cable the data sheet says it’s current carrying capacity is 136amps. The lengths will be 0.5m.Is there any other consideration I should take into consideration? It will...
    • Jako13!
    • Thread
    • cable capacity carrying current current carrying capacity rated
    • Replies: 6
    • Forum: UK Electrical Forum
  17. 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...
  18. P

    Can anyone confirm the breaking capacity of this?

    Hi, Interested in the breaking capacity of this fuse... 4kA? Anyone know for sure? Thanks
  19. 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
  20. 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...
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