2382-622 exam question

IvayloP · 2025-02-03T16:46:29+0000

Hi there. I am a student part time for level 1 &2 in UK. I will have an exam 2382-622 but I stuck to one of the questions. Actually when I looked for information around and make some thinking about it I think the answer would be,B - Maximum demand, because everything else can be directly measured or calculated. Am I right with that though.
I don’t know why the picture can’t be attached. The answers are
A- nominal voltage
B- maximum demand
C- prospective fault current
D- earth fault loop impedance

westward10 · 2025-02-04T08:37:07+0000

B - has nothing to do with supply characteristics.
The answer you are looking for is on page 510 of BS7671.

IvayloP · 2025-02-04T08:54:25+0000

mainline said:
Look at 313.1

Because of 313.1 I am stuck on that. They said- shall be determined by calculation, measurement, enquiry or inspection.
Nominal voltage, PSCC , earth fault loop impedance, maximum demand e t c.
And then “the above information should be provided by distributors on request “
So everything from above can be measured or gets from the energy company. But the question is which of these can be ONLY determined from enquiry- and the once that isn’t there is PFC . But it can be achieved when earth fault loop impedance is done with the multimeter or by calculating.

IvayloP · 2025-02-04T08:56:40+0000

westward10 said:
B - has nothing to do with supply characteristics.
The answer you are looking for is on page 510 of BS7671.

Yes but in EIC all of the four answers are under the supply characteristics, but which of these can only be obtained by enquiry?

westward10 · 2025-02-04T08:59:53+0000

Do you have BS7671 because the answers is on page 510. B does not fall under supply characteristics, it may be one of the answers but it is not a characteristic.
If you don't have BS7671 then I will post a pic of the page.

IvayloP · 2025-02-04T11:06:55+0000

westward10 said:
Do you have BS7671 because the answers is on page 510. B does not fall under supply characteristics, it may be one of the answers but it is not a characteristic.
If you don't have BS7671 then I will post a pic of the page.

Yes I have it. The page 510 is EIC certificate. Yes all four answers are under supply characteristics. But the question is which of these can ONLY be obtained by enquiry. Not by measurement or calculation ,only by enquiry the grid company.
By my latest opinion from the answers here I think the nominal voltage Only can be obtained by enquiry.

IvayloP · 2025-02-04T11:15:00+0000

westward10 said:
Do you have BS7671 because the answers is on page 510. B does not fall under supply characteristics, it may be one of the answers but it is not a characteristic.
If you don't have BS7671 then I will post a pic of the page.

westward10 · 2025-02-04T11:22:50+0000

Do you have BS7671?

Tom256 · 2025-02-04T18:48:11+0000

IvayloP said:
Yeah maybe I have a different view about something. In my country when the electrician should make a new DB he must now the maximum demand of the supply , what that main cable and power company can provide. This usually is the amount of the MCB after the meter , the power batch - 10kW, 15kW e t c. Only after that he can do thinking about how the DB will be made and what circuits should include to fit in that. And then the maximum demand of the load comes to each circuit. Maybe this is wrong interpretation because of the two different languages and because of that, that I have knowledge from other country make me to think different on such questions. But thank you about your help. Tomorrow will be my exam, I hope it will be successful. Have a great day

Yes you need to know the demand when designing in the UK, but as I and Westward have said, the demand is not a supply characteristic it is a characteristic of the load so it can be ruled out. See my post number 14

westward10 · 2025-02-04T18:52:48+0000

All he need do is look on page 510 of BS7671 the answer is there.

Tom256 · 2025-02-04T18:55:46+0000

westward10 said:
All he need do is look on page 510 of BS7671 the answer is there.

Yes it is.
I wanted to offer him a way of understanding the questions also

mainline · 2025-02-04T20:38:20+0000

Tom256 said:
as I and Westward have said, the demand is not a supply characteristic it is a characteristic of the load so it can be ruled out. See my post number 14

This may have caused him a bit of confusion when trying to omit answer B.

313.1
The following characteristics of the supply or supplies, from whatever source, and the normal range of those characteristics where appropriate, shall be determined by calculation, measurement, enquiry, or inspection:

(v) The suitability for the requirements of the installation, including the maximum demand

These characteristics shall be ascertained for an external supply and shall be determined for a private source. These
requirements are equally applicable to main supplies and to safety services and standby supplies.

IvayloP · 2025-02-04T20:55:44+0000

mainline said:
This may have caused him a bit of confusion when trying to omit answer B.

313.1
The following characteristics of the supply or supplies, from whatever source, and the normal range of those characteristics where appropriate, shall be determined by calculation, measurement, enquiry, or inspection:

(v) The suitability for the requirements of the installation, including the maximum demand

These characteristics shall be ascertained for an external supply and shall be determined for a private source. These
requirements are equally applicable to main supplies and to safety services and standby supplies.

Exactly what I meant

About that everything can be measured calculated or obtained by enquiry. But guys the question is which of these four things can be ONLY determined by enquiry. Or with other words- which of these cannot be determined with calculation or measurement.

IvayloP · 2025-02-04T20:58:03+0000

westward10 said:
All he need do is look on page 510 of BS7671 the answer is there.

On page 510 is Electrical Inspection Certificate.

Tom256 · 2025-02-04T20:58:28+0000

IvayloP said:
Exactly what I meant About that everything can be measured calculated or obtained by enquiry. But guys the question is which of these four things can be ONLY determined by enquiry. Or with other words- which of these cannot be determined with calculation or measurement.

The maximum demand is needed to ensure the supply provided meets the requirements of the use of the installation.

Anyway, the answer is The Nominal Voltage. The reasons why have been set out if you need more please ask.
Confirmation of this answer is clearly stated on the notes that Westward pointed you towards within page 510

mainline · 2025-02-04T21:01:57+0000

IvayloP said:
Exactly what I meant About that everything can be measured calculated or obtained by enquiry. But guys the question is which of these four things can be ONLY determined by enquiry. Or with other words- which of these cannot be determined with calculation or measurement.

It's not about being able to measure it, as already said its knowing what It's supposed to be.