A
Ashley2
Is there any way of getting the PEFC if you only have the Ze?
I would have thought that the PFC is always measured (Taking the higher of the PEFC/PSCC), & then a calculation to ensure that the protective device is able to handle the PFC. This is correct
Some of the information given was as follows: Information to what?
The Ze given was 0.8Ω
The voltage given was 230 V a.c.
The protective device was 100A.
PEFC should be less than the 100A. This is why I asked whether there was a way of calculating the PEFC with the Ze given.
it is ohm's law I = V/R, so in the case you mention. I = 230/0.8 = 287.5A. what makes you think it should be <100A. the rating of the fuse has nothing to do with it.
The 100A information was already given, for the protective device, as was the Ze for the supply. And the question asked what the PEFC was. Bear in mind that this was a part B scenario for 2391, & the 100A for the protective device was already given, therefore, in the first instance, the PEFC must be less than the protective device.
I am looking at 435.5.1: which states that the breaking capacity rating of each protective device shall be not less than the prospective fault current at its point of installation". I strongly suspect that it is ohms law, but the 100A protective device was the mind boggler, taking into account 435.5.1.
the PEFC must be less than the protective device
I disagree, 2391 is supposed to be tough, it's supposed to make you think. If it was easy it wouldn't be worth havingKISS should be the motto in 2391.
I don't mean that, KISS, is basically to ensure that you focus on the issue, & in this instance the issue was Ohms law. But in an examination environment your are always looking for that one issue that 'they' might be trying to trip you on. In relation to KISS, I believe that it is relevant in all areas, & not just within this context. KISS focuses on that which is directly relevant, & in this case, Ohms law was directly relevant.I disagree, 2391 is supposed to be tough, it's supposed to make you think. If it was easy it wouldn't be worth having
measurement is better than calculation lol
I actually think it's good that they put in information that is irrelevant to the question. It means you have to read and think "What is it they're wanting here, what information is important and what is not" Just like you would in the real world.
do you not believe what my learned friends are telling you? I am shocked that so many people have had to say the same thing....
With all due respects, I have found the responses highly interesting, however, the one you posted, as per above does not do anything for me.
Ashley, Guitarist is among the nicest, well mannered and clued up posters on here. If you think he's bullying you then you have very thin skin, wait till you annoy some of the guys here. Then you'll know mateSuffice to say that Guitarist has 1 Friend mentioned in his Profile, & I do not have to go a million miles to see why 1shortcircuit came in straight away to criticise me after Guitarist. The concept of cyber bullying is not a new phenomenon.
This is a forum, the purpose of which is to promote critical thinking, meaningful problem solving & knowledge construction, take your cyber bullying elsewhere. I will decide what will do me good, it is not for anyone to make that decision for me.
I have found the responses from other members highly interesting & I found the one posted by Guitarist, did not do anything for me. That response correlated with some of the others that Guitarist has posted in other threads, in that they tend to have a low interest value, & tend to rant, the others did not. There was a world of difference between what MarkieSparkie wrote & the rant that came from Guitarist.
Suffice to say that Guitarist has 1 Friend mentioned in his Profile, & I do not have to go a million miles to see why 1shortcircuit came in straight away to criticise me after Guitarist. The concept of cyber bullying is not a new phenomenon.
This is a forum, the purpose of which is to promote critical thinking, meaningful problem solving & knowledge construction, take your cyber bullying elsewhere. I will decide what will do me good, it is not for anyone to make that decision for me.
I have found the responses from other members highly interesting & I found the one posted by Guitarist, did not do anything for me. That response correlated with some of the others that Guitarist has posted in other threads, in that they tend to have a low interest value, & tend to rant, the others did not. There was a world of difference between what MarkieSparkie wrote & the rant that came from Guitarist.
Grammer and spelling ? 'Full stop' to that too. Never seen such small sentences.This.was in.the.2391 on.the 9th this.month.why warry should have reaulta.by the 12th.October if worse come worse.re sit.ir
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Suffice to say that Guitarist has 1 Friend mentioned in his Profile, & I do not have to go a million miles to see why 1shortcircuit came in straight away to criticise me after Guitarist. The concept of cyber bullying is not a new phenomenon.
This is a forum, the purpose of which is to promote critical thinking, meaningful problem solving & knowledge construction, take your cyber bullying elsewhere. I will decide what will do me good, it is not for anyone to make that decision for me.
I have found the responses from other members highly interesting & I found the one posted by Guitarist, did not do anything for me. That response correlated with some of the others that Guitarist has posted in other threads, in that they tend to have a low interest value, & tend to rant, the others did not. There was a world of difference between what MarkieSparkie wrote & the rant that came from Guitarist.
Suffice to say that Guitarist has 1 Friend mentioned in his Profile, & I do not have to go a million miles to see why 1shortcircuit came in straight away to criticise me after Guitarist. The concept of cyber bullying is not a new phenomenon.
This is a forum, the purpose of which is to promote critical thinking, meaningful problem solving & knowledge construction, take your cyber bullying elsewhere. I will decide what will do me good, it is not for anyone to make that decision for me.
I have found the responses from other members highly interesting & I found the one posted by Guitarist, did not do anything for me. That response correlated with some of the others that Guitarist has posted in other threads, in that they tend to have a low interest value, & tend to rant, the others did not. There was a world of difference between what MarkieSparkie wrote & the rant that came from Guitarist.
If you feel that my post is irrelevant and the post such as MarkieSparkie's is useful and you understand then that is superb, perhaps I judged you wrong?ng Dime Bar!!!!
in terms of what I wrote after your post, is wrong, relating to the profile issue, then I apologise.