HELP PLEASE!!! 2365/615 electrical system designs

[John J]

So I’ve recently started my level 3 course and I’m doing electrical system designs the one with the hotel extension and pool and cafe block I’ve done question 1 but stuck on all of question 2 some guidance would be appreciated thanks.

 

[Fender]

Easy method, use the adiabatic equation to find out the size

S = ✓ I^2 * t / k

I = the current required to operate the device
t = disconnection time required for the device
k = factor given for the cable selected - Typically 115

So for argument's sake, let's say we have a fault current of 320 (taken from your trip curves) a time of 0.1 (taken from your device operating times) and a K factor of 115 (taken from the tables following the trip times)

S = ✓ I^2 * t / k
S = ✓ 320^2 * 0.1 / 115
S = ✓ 102,400 * 0.1 / 115
S = ✓ 10,240 / 115
S = 101.19 / 115
S = 10.05

As there is no conductor with a CSA of 10.5, you select the next size up, in this case 16mm^2

The above is purely and illustration and values may not be accurate but it serves to show how to lay out the equation so that you can understand what is going on at each step.

Hope this helps

I'm with you all the way, apart from 101.19/115 equaling 10.05. I feel awful for pointing that out.

Sorry

 

[Fender]

Ah. Just noticed the date....

 

[Lister1987]

I'm with you all the way, apart from 101.19/115 equaling 10.05. I feel awful for pointing that out.

Sorry

Don't, the point was to put across the layout/concept, thr fact that maths is wrong just gives me a chuckle.. that'll learn me for trying to be a smartarse ?

 

[Lister1987]

Hi guys, new to the forum. Can some one tell me how I can get access to the trainee forum? Everytime I click on the link Apply to Gain Access to Trainee-Only Forum, it stays on the same page.

I'm probably just being a bit thick!

Drop a PM to @Dan or @Lou , follow the template given and you'll be in soon

 

[Gooner85]

@Loki be much appreciated completely lost Atm

I’m doing this aswell and completely lost did you manager to do it all

 

[BrumElecEng]

Hi all,

Just started doing the 2365-305 assignment myself. As with the above advice given by the experienced/expert members, I'll try and ask one focused question at a time
Is there a website that we can see all of the BS EN 60617 symbols needed for the assignment?

Thanks

 

[Lister1987]

Most listed here; Electrical Symbols | TLC Electrical - https://www.tlc-direct.co.uk/Technical/Symbols/Index.htm

In fairness you'll find that ones you need in OSG, atypically you'll be using sockets, light fixtures, light switches, motors, emergency lighting and the standard symbol for a CU

 

[BrumElecEng]

Most listed here; Electrical Symbols | TLC Electrical - https://www.tlc-direct.co.uk/Technical/Symbols/Index.htm

In fairness you'll find that ones you need in OSG, atypically you'll be using sockets, light fixtures, light switches, motors, emergency lighting and the standard symbol for a CU

Thanks for the help lister! Think I have nailed questions 1,2,8,9,10. Going to give the others a shot now but will be back if I need some hints/tips

 

[Ljs1996!]

Thanks for the help lister! Think I have nailed questions 1,2,8,9,10. Going to give the others a shot now but will be back if I need some hints/tips

Hi on question 1 did you find an example on the internet to use

 

[Lister1987]

Hi on question 1 did you find an example on the internet to use

Likely yes, it's not a hard one to grasp; Find a manufacturer (Fusebox, Wylex, BG), Download/Print the datasheets and use them in your project. Not sure why this is hard for some (not a dig at OP, purely an observation as it's not that first time this has come up)

 

[Edtwozeronine]

I did this in 2018 it was very much like being told to outfit a Travelodge, if you've ever been in one you'd recognise the layout. It's just they've removed all the socket outlets, fused spurs, electric radiators, heated towel rails and lighting on the plans and expect you to do a competent job filling in the blanks.

 

[lee75hunt]

Hi all, doing my design assignment. Ive done questions 1,2,3 and filled out table 1 as best i could. When it comes to the distribution circuit, im a bit lost. I know it needs a 5s disconnection time but apart from that is there another calculation i should be doing? Also what type breaker should be feeding it? Thx for any help

 

[Calebp43]

Are we still doing this guys? I am and can help out if you need it.

 

[Calebp43]

Hi all, doing my design assignment. Ive done questions 1,2,3 and filled out table 1 as best i could. When it comes to the distribution circuit, im a bit lost. I know it needs a 5s disconnection time but apart from that is there another calculation i should be doing? Also what type breaker should be feeding it? Thx for any help

Are you on Q4? What distribution circuit?

 

[Ben123456]

Are we still doing this guys? I am and can help out if you need it.

Yes I’m stuck on question 4 if you can help

 

[Edtwozeronine]

what is question 4? can't answer it without knowing the details, i honestly have no idea how anyone found this part of the course hard. the science exams and equations were by far and away the hardest parts of the course, the rest was like an English comprehension exercise.

 

[Ben123456]

what is question 4? can't answer it without knowing the details, i honestly have no idea how anyone found this part of the course hard. the science exams and equations were by far and away the hardest parts of the course, the rest was like an English comprehension exercise.

I’ll have to post it into the group when I’m home, this was given to me about 5 months ago and I’ve left it too late and forgotten about it any help in the right direction from anyone would be appreciated.

 

[Edtwozeronine]

God I hate the grey-out on this forum, I use browsers with built in ad-blockers and I won't be changing this in the foreseeable future. No other forums I'm on do this --------, so I won't be making any exceptions for this place! You've got a strip of adverts down the right hand side of the screen and that should be enough to keep you ticking over, now I realise why I stopped coming to this forum!

 

[ipf]

God I hate the grey-out on this forum, I use browsers with built in ad-blockers and I won't be changing this in the foreseeable future. No other forums I'm on do this --------, so I won't be making any exceptions for this place! You've got a strip of adverts down the right hand side of the screen and that should be enough to keep you ticking over, now I realise why I stopped coming to this forum!

I tend to agree with you, there.
......and it's like a monkey puzzle trying to locate different forums and threads.
I feel it's too complicated with too much info showing for each forum introduction...as well as the adverts all over. It just needs basic lists, as it used to be.

 

[River Song]

@John J I can't PM you as you have limited who can see your profile.
PM me & I'll send you my PDF file