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.

 

[camerondurance]

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.

im the same john stuck on question 2 a 2b right to 2i

 

[Lister1987]

2a - Find some lights, print off manufacturers data on said lights

2b - Draw on the positions of the lights

2c - Draw on sockets and FCUs

2d - Draw on each circuit on such a way that a fault with 1 circuit will not affect another

2e - devise a numbering method to ID circuits in relation to the circuit number, room number and/or phase

2f - Draw on any additional distribution boards of you deem th necessary

2g - Draw on lighting circuits in relation to the pool and show switching positions

2h - devise a numbering method to ID circuits in relation to the circuit number, location and/or phase

2i - Annotate drawings with symbols compliant with BS EN 60617.

im the same john stuck on question 2 a 2b right to 2i

 

[camerondurance]

does any one have any completed or part done plans for the 2365/5357 drawings to see if I am doing it right

 

[Lister1987]

does any one have any completed or part done plans for the 2365/5357 drawings to see if I am doing it right

Show us what you have and we'll steer you in the right direction

 

[camerondurance]

I’m suck with the question attached 615 2365 electrical design project ? question 5 2 hours still can’t work out the answer

 

[Lister1987]

I’m suck with the question attached 615 2365 electrical design project ? question 5 2 hours still can’t work out the answer

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

 

[camerondurance]

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

Thanks for this it’s just different this level 3 as I’m dyslexic not with reading and writing but with maths and new things of of my comfort zone

 

[camerondurance]

im doing the desgn project an finding it really difficult as I don't work in this back ground currently if any one wants to work on it together in emails or whats app give me a shout

 

[Jaip97]

@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

Hi I am doing the same project as well and am struggling with it, please could you send me a copy of your project
Thanks

 

[Lister1987]

Thanks for this it’s just different this level 3 as I’m dyslexic not with reading and writing but with maths and new things of of my comfort zone

Dyscalculia you mean? ?

 

[tild01]

im doing this assignment right now honestly i think its mental who thinks of this ----

 

[Lister1987]

im doing this assignment right now honestly i think its mental who thinks of this ----

What you struggling on? Show us what you have and we'll offer some guidance.

 

[tild01]

What you struggling on? Show us what you have and we'll offer some guidance.

Hi,

I don't currently have any pictures but I've drawn out on the hotel rooms how each would be wired for what the spec asks for. After reading through and breaking down the task sheet and looking around the forum I am beginning to understand this more taking it a bit at at time. I have less than 2 weeks so I was in a bit of a panic.

This is a question I do not understand

"Select, with the aid of manufacturers’ data, a suitable range of circuit protective devices for this
contract. Your selection should be based on the following
 Prospective short circuit currents
 Requirements for additional protection and special locations"

 

[Lister1987]

Hi,

I don't currently have any pictures but I've drawn out on the hotel rooms how each would be wired for what the spec asks for. After reading through and breaking down the task sheet and looking around the forum I am beginning to understand this more taking it a bit at at time. I have less than 2 weeks so I was in a bit of a panic.

This is a question I do not understand

"Select, with the aid of manufacturers’ data, a suitable range of circuit protective devices for this
contract. Your selection should be based on the following
 Prospective short circuit currents
 Requirements for additional protection and special locations"

Ok, easy;
Select a suitable range of OCPDs generically (B6, C32 60898/61009s) them download the datasheets from a manufacturer of your choosing and add them to the assignment.

You should be able to calculate PFCs based on Uo and calculated Zs from estimated cable run sizes (assume you have Ze?)

As for special locations, here's a RCD Omission matrix from a different project to help (attached)

 

[Lister1987]

Column 1 Circuit name
Column 2 applicable 7671 regulations
Column 3 reasons for RCD Omission
Column 4 RCD Required? Y/N