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BS7671 Amendment 4. Sidebar markers

JohnE

I have the Bronze digital subscription package

I've noticed that the online edition does not have the vertical marker lines
on the right hand side of the page to highlight a change from the previous editions.
I have been informed that the lines are in the gold subscription.


Any ideas why
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  • 0

    I wouldn't feel too left out if I were you ... even in the printed version the side bars seem not to quite have the value they should have.

    Many show only stylistic differences (e.g. "r.m.s." changes to "RMS") while others seem to appear where I can see no changes at all.

    Most worrying there seem to be some small but significant changes (e.g. > changing to ≤ in A722,3) which aren't indicated at all (in that case I suspect it's just a correction of an earlier error, but it's still a change from the previous published version as far as I can see).

       - Andy.

  • 0 in reply to AJJewsbury
    AJJewsbury said:
    Most worrying there seem to be some small but significant changes (e.g. > changing to ≤ in A722,3)

    That must be an error.

  • 0 in reply to AJJewsbury
    Chris Pearson said:
    That must be an error.

    This is a background for the change:

    Above is a clip from BS 7671:2018+A2:2022. NOTE 1 is intending to tell us that there are two conditions where the minimum value of RA ev should be taken as 200 Ω:

    (a) Where the formula preceding the NOTE leads to a value of resistance exceeding 200 Ω; and
    (b) Where the formula preceding the NOTE gives a negative or invalid (division by zero) value of resistance.

    The formula will give a negative value of resistance where ImU0Cmax ≤ 70 (IL1+IL2+IL3), i.e. for very small neutral currents. Rearranging this inequality, we get:

    Which is clearly not was was printed in BS 7671:2018+A2:2022, and hence there was in error here (as above).

    AJJewsbury said:
    Most worrying there seem to be some small but significant changes (e.g. > changing to ≤ in A722,3) which aren't indicated at all (in that case I suspect it's just a correction of an earlier error, but it's still a change from the previous published version as far as I can see).

    Yes, I can see this in my printed version, and the version on VitalSource that's not EPUB 3 format.

  • 0 in reply to AJJewsbury
    AJJewsbury said:
    Many show only stylistic differences (e.g. "r.m.s." changes to "RMS") while others seem to appear where I can see no changes at all.

    Style changes (such as moving to all caps, or changing list formats) have not changed the actual of the requirement, and therefore were not considered a 'change' - it's just formatting.

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  • 0 in reply to AJJewsbury
    AJJewsbury said:
    Many show only stylistic differences (e.g. "r.m.s." changes to "RMS") while others seem to appear where I can see no changes at all.

    Style changes (such as moving to all caps, or changing list formats) have not changed the actual of the requirement, and therefore were not considered a 'change' - it's just formatting.

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  • 0 in reply to gkenyon

    Style changes (such as moving to all caps, or changing list formats) have not changed the actual of the requirement, and therefore were not considered a 'change' - it's just formatting.

    That's what I would have expected, yet such changes seem to be triggering change bars (e.g. 411.8.1.2 or the 2nd line of 434.5.3 (a)). (Unless there some other change I've overlooked)

       - Andy.

  • 0 in reply to AJJewsbury
    AJJewsbury said:
    That's what I would have expected, yet such changes seem to be triggering change bars (e.g. 411.8.1.2 or the 2nd line of 434.5.3 (a)). (Unless there some other change I've overlooked)

    Interesting, the changes there are 'rms' to 'RMS' and the inclusion of the word 'or'. I can see the latter is definitely a change to be marked, but the change bar for the former is, perhaps, unnecessary.

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