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What do you think I just copied and pasted from?Try chapter 44 Protection against voltage disturbances and electromagnetic disturbances.
Discuss Are all EV charge point installers this bad? in the UK Electrical Forum area at ElectriciansForums.net
What do you think I just copied and pasted from?Try chapter 44 Protection against voltage disturbances and electromagnetic disturbances.
Page 5What do you think I just copied and pasted from?
Ah, I see where you're coming from.Page 5
Chapter 44 Protection against voltage disturbances and electromagnetic disturbances
Section 443, which deals with protection against overvoltages of atmospheric origin or due to switching, has been redrafted.
The AQ criteria (conditions of external influence for lightning) for determining if protection against transient overvoltages is needed are no longer included in BS 7671. Instead, protection against transient overvoltages has to be provided where the consequence caused by overvoltage (see Regulation 443.4)
(a) results in serious injury to, or loss of, human life, or
(b) results in interruption of public services/or damage to and cultural heritage, or
(c) results in interruption of commercial or industrial activity, or
(d) affects a large number of co-located individuals.
For all other cases, a risk assessment has to be performed in order to determine if protection against transient overvoltage is required.
There is an exception not to provide protection for single dwelling units in certain situations.
If the hazard analysis identifies a voltage surge as being possible? (with the main input isolated?) Then the next stage is the risk assessment.But you can't eliminate the chance of voltage surges, so a risk assessment is the thing to do.
You seem to have a thing about this Mike!If the hazard analysis identifies a voltage surge as being possible? (with the main input isolated?) Then the next stage is the risk assessment.
True, but I think most of this discussion has been around the previous guidelines/regs.
Try chapter 44 Protection against voltage disturbances and electromagnetic disturbances.
The reason the hazard analysis is a precursor to the risk assessment is if the analysis is able to eliminate the hazard the risk assessment is not needed.
I suppose like all proof reading of publications, errors don't always get picked up. Seem to recall, has happened previously with BS7671.
It's an error, which I pointed out to the NICEIC instructor on my Amendment 2 course. He wasn't aware of it, but agreed that the OSG had retained a whole section that should have been deleted.@loz2754 just quoted 443.4.1 from Chapter 44.
Oddly enough 3.7.2.1 of the new OSG quotes the very same regulation verbatim and then goes on to expand upon it with further advice that I can not find within the BB(rown)B.
Advice from OSG appears to deviate slightly from BBB, but the distinction is quite significant.
The reason the hazard analysis is a precursor to the risk assessment is if the analysis is able to eliminate the hazard the risk assessment is not needed.
Don't think of your individual situation think more global, think hazard first, identify and eliminate if possible, if not then complete a risk assessment.In the case of transient voltages due to the effects of indirect lightning strikes, how would one go about arguing that no hazard exists or eliminating the hazard entirely, without installing surge protection?
Don't think of your individual situation think more global, think hazard first, identify and eliminate if possible, if not then complete a risk assessment.
I was just trying to clarify for those that don't know that a Hazard Analysis is separate from the Risk Assessment and is carried out first with the main aim to eliminate the Hazard.
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