Assignment advice - wiring diagram

[MrShine94]

Hello

Please could someone advice me on how I can improve this basic wiring diagram.

 

[MrShine94]

 

[Spunkywads26]

On your first picture I would show and label the PEN conductor and how it splits at the service head. This would illustrate that you understand the earthing system and its arrangement, even though the circuit at the end of the line has become a TT system.

I would also show all the phases, neutral and earth going from each piece of kit. As I said you should label the PEN conductor, and Main Earthing conductor then it will become a CPC. Also reference the fact that there will be bonding conductors to Water, gas, structure etc.... This illustrates the parallel paths.

 

[Taylortwocities]

The supply is TNC-S. Don't you get a neutral with that, from the centre of the star winding at the substation?

 

[Taylortwocities]

 

[Jamie']

It also states that you need to show your earth fault path so don't forget to add that

This could be a nice thing to aim for obviously adding the extra things in you need.

 

[static zap]

Symbol for transformer appears a little inconsistent either side of
magnetic core |||
(ELTK04a ..simplifies windings to Angled-Arrow wires ..eeek)
(Then adds to confusion angling earth-point ...)

 

[Richard Burns]

You have the wording there in the text to guide you on what is needed.
So you need to have a circuit diagram fully labelled from transformer to charging unit 400V only including at least block diagrams of distribution boards, metering or consumer control equipment and showing the total earth fault path for the charger.

As part of the electrical contract, the client is considering an electric vehicle charging unit in the car park supplied from the existing TNC-s supply in the main hotel building. ….

Draw a fully labelled circuit diagram illustrating the three phase 400V supply system and earthing arrangement from the substation transformer through to the charging unit. The diagram should show the total earth fault loop path for the charging unit.

Your diagram does not need to show the complete detail of distribution boards, metering or consumer control equipment although the diagram should, as a minimum, indicate a connection point for each item of equipment.

Your diagram identifies units along the route but has no indication of line(s), neutral, earth, does not show the separation of the TNCS earth or the earth fault path.
You have shown the supply earth and the line conductors.
Use of colour may help to identify items and more comprehensive labelling would also help.

 

[Edtwozeronine]

Pasteboard — Uploaded Image - https://pasteboard.co/HhvU0iT.png

This is my effort on the same project.

 

[MDJ]

Please could someone advice me on how I can improve this basic wiring diagram.

Yes start again, regardless of whether it is right or not I suggest you use a ruler for just one bit of advice, and try to make the drawing look nice, all I see is a ball of wall.

 

[Richard Burns]

Pasteboard — Uploaded Image - https://pasteboard.co/HhvU0iT.png

This is my effort on the same project.

But you have not shown the earth fault path for the charger.
However that is much more like a diagram!

 

[Marti]

Have no wish to be unkind but a suggestion to help your progress. Our tutor has limited patience with students who do not process a ruler or a protractor. Also, insisting on using the calculator in your phone will get a short answer when he's trying guide 13 folk with matching Casio's. I repeat; just suggesting.

 

[MrShine94]

So how far are you on the assignment ?

 

[Marti]

Hotel block ,Cafe and pool in a spreadsheet for the cable cable calc's etc. My greatest weakness is going off at an interesting tangent; need to be better at just answering the question ASKED or loose marks.

 

[Edtwozeronine]

But you have not shown the earth fault path for the charger.
However that is much more like a diagram!

The path goes back via the general mass of earth as it goes from a TN-C-S system to a TT-like system and my tutor has seen it and not commented that it needs improving. The idea is it shouldn't interfere with the rest of the Hotels electrical systems if a problem occurs with the EV charging socket.

I'll have to check the question again to see if they want the earth fault loop path depicted as well, it wouldn't take much work. We did this question at the beginning of the year we're almost wrapped up with this year, a couple more evolves and practical tests to go.

You certainly don't want to be doing a block diagram like the previous gentleman.