Electrical Design - Calculating Circuit Current

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Having laid the foundations for designing an electrical circuit in the previous video in this series we're now going to start crunching numbers by figuring out how to calculate design current.
Why is design current so important, where do we get the values for figuring it out from and why don't we use the exact same symbols we learnt in our science lessons?
Heat is both the result and the enemy of electrical installation and in this video we start to explore just how to make sure that heat doesn't become a problem, so that your installations stay safe for years after you're finished.
Take a dive with Joe into the exciting world of electrical design in this series of videos that will help you if you're just starting out in this area at college or work. Even if you've been an electrician for years, there's something for everyone in this series of videos.
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🕐 Chapters 🕕
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00:00 How is Design Current Calculated?
00:05 Free Electrical Design Training: 👉 training.efixx.co.uk/course/i...
00:30 First step in circuit calculation
00:49 Heat is the enemy of electrical installation
01:03 Consequences of incorrect electrical design
01:27 How cables are affected by poor electrical design
01:59 How does power affect the amount of current drawn?
02:33 Why do we use different symbols for calculating current?
02:52 What does Ib mean?
03:01 What does Uo mean?
03:38 The calculation for finding design current
04:01 Working out how much current our load uses
04:29 Other factors that affect design current
04:57 Next video in the series, Selecting the Right MCB: 👉 • Electricians' Guide: C...
05:04 Free CPD: 👉 training.efixx.co.uk/course/i...
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📹 Presented by
Joe Robinson - Technical Editor
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#electricaldesign #electricians #electricalinstallation

Пікірлер: 9

@barnsley1066 6 ай бұрын

As always, another excellent presentation.

@efixx 6 ай бұрын

Thank you very much! 😊

@shawnshawn911 6 ай бұрын

Great video

@Umski 6 ай бұрын

This seems like basic GCSE level physics/electrical theory rather than CPD - I’d be a little concerned if there are “qualified” sparks out there that need to learn this now 😮

@jonathanrose456 6 ай бұрын

Great video again. Just one question, though it’s something I come up against a lot… what should the pfc be if at 60A, 80A, 150A, 200A, etc.? I’m sure I’ve been taught it, but forgotten.

@busman2000 6 ай бұрын

I am aware that you have other videos, However I think you would also consider the length of the coductor and it's cross-sectional area . To let you know, will the conductor carry the proposed current adequately or have an abundance , costing the client money.

@SeanyyBoy_ 6 ай бұрын

Excellent Joe! Can you clear up a 3 phase design please? I'm unsure whether U0 is 400V or 230V and which one you use to multiply it by root3... Right now I think this... You use the nominal Phase Voltage. This will be 230V in a single phase installation, but can be 230V or 400V in 3 phase depending on the supply.. usually you have a star supply from the transformer so U0 is still 230V, but is there industries that use a Delta supply and therefore U0 would be 400V and would you still times 400V by root3? Hopefully my thinking makes some sense. Anyway thank you I love these videos and I've learnt so incredibly fast on my journey to becoming an electrical engineer! Edit. my bad, I got line and phase voltage mixed up. U0 is always 400V and therefore needs multiplying by root 3 if the supply is a star supply. So if its a delta supply, you don't need to multiply U0 by root 3?? Because phase voltage and line voltage are the same????????

@_eusty 6 ай бұрын

Yes on a 3 ph delta load the current will need dividing by root 3. i.e a 15kw load will be about 21A.