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 · 2025-02-03T17:10:26+0000

Seeing the question might help.

IvayloP · 2025-02-03T17:31:47+0000

IvayloP said:
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.

westward10 said:
Seeing the question might help.

Yes I agree

Just edited it. There was some problem with the picture.

westward10 · 2025-02-03T19:01:26+0000

Which one of those is a characteristic which can be obtained by enquiry?
I have repeated the question because you need to rule out the three which are not found by enquiry.

mainline · 2025-02-03T19:05:51+0000

IvayloP said:
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

How would you determine the nominal voltage.

IvayloP · 2025-02-03T20:26:56+0000

mainline said:
How would you determine the nominal voltage.

With direct measurements?

IvayloP · 2025-02-03T20:37:34+0000

westward10 said:
Which one of those is a characteristic which can be obtained by enquiry?
I have repeated the question because you need to rule out the three which are not found by enquiry.

Ehmm the nominal voltage can be measured as well as prospective fault current and earth fault impedance. Let to clarify my view. I am on site and have to connect new house for example. There is the main intake power cable and I can to measure what voltage is present also PFC and earth fault impedance. The thing that I don’t know is how much power the grid company is allowed to be used from it. But in other point of view, the regular electrician like me shouldn’t do that and I will find the main disconnector before the meter and probably two pole switch after it. From the value of the fuse before the meter I will know the maximum demand. Or maybe I missed something

mainline · 2025-02-03T20:43:05+0000

IvayloP said:
Ehmm the nominal voltage can be measured as well as prospective fault current and earth fault impedance. Let to clarify my view. I am on site and have to connect new house for example. There is the main intake power cable and I can to measure what voltage is present also PFC and earth fault impedance. The thing that I don’t know is how much power the grid company is allowed to be used from it. But in other point of view, the regular electrician like me shouldn’t do that and I will find the main disconnector before the meter and probably two pole switch after it. From the value of the fuse before the meter I will know the maximum demand. Or maybe I missed something

Look at 313.1

Tom256 · 2025-02-03T20:44:30+0000

IvayloP said:
Ehmm the nominal voltage can be measured as well as prospective fault current and earth fault impedance... Or maybe I missed something

Do you understand the meaning of the word 'nominal'?

IvayloP · 2025-02-03T21:28:07+0000

Tom256 said:
Do you understand the meaning of the word 'nominal'?

What you mean? The nominal voltage on the public supply is 230 for one phase and 400 for three phases. What you understand under public supply? Or you told me that the nominal voltage is the thing that only energy company can give me?

IvayloP · 2025-02-03T21:29:55+0000

mainline said:
Look at 313.1

Thanks I will see it later, the book isn’t with me now. The tutor said all information is there but something is still missing to me.

Tom256 · 2025-02-03T21:42:50+0000

IvayloP said:
What you mean? The nominal voltage on the public supply is 230 for one phase and 400 for three phases. What you understand under public supply? Or you told me that the nominal voltage is the thing that only energy company can give me?

If you did not know the nominal voltage of the UK, could you take a voltage measurement at the new home in your example and know what it was?

IvayloP · 2025-02-03T22:05:22+0000

Tom256 said:
If you did not know the nominal voltage of the UK, could you take a voltage measurement at the new home in your example and know what it was?

Yes of course. Actually it can be achieved only with seeing the type of the cable but this is less likely to be asked into that exam

. Do you think the answer is the nominal voltage?
Wait!! I think I’ve got your point . I can do a direct measurement and will find some voltage there, but I will not know that this is the nominal voltage. The nominal voltage is kind of knowledge or if someone tells you what value it should be. Same as the nominal voltage of appliances you can’t measure it , you only can check the label or ask the manufacturer. Is that true?