Details of BS7671:2018 Amendment 1 are here.

personally, I;d be happy with that, I note and concur with the 25V maximum exposed voltage instead of 50 instead of 70, why, well , the outdoors is wet, and metal cars are large.


After some digging, it seems the 70V figure comes from a part of IEC 60479-5 that relates to shocks that are only from hand to foot (not one hand on car to another hand on a fence rails), and assumes skin contact areas of 12cm2 or less (if that sounds like a large area, it isn't,  it is a total area of skin a touch over 2 inches by 1- gripping a typical door handle creates a substantially a bigger contact area for all but the most childish hands. Even on a small child a wet footprint is  a larger area)

It is a voltage which may work better for the largest typical bare part of a painted lamp post or traffic lights working in earth return mode on a dry day.


Also statistically there are about 7.5 million lamp posts on the road today *, vs 32 million cars and 4 million vans and half a million lorries. Of course only quarter of a million of those are currently electric, but the car hazard could  become quite a bit more common than the lamp post.


*I agree the lamp posts are slower moving..

personally, I;d be happy with that, I note and concur with the 25V maximum exposed voltage instead of 50 instead of 70, why, well , the outdoors is wet, and metal cars are large.


After some digging, it seems the 70V figure comes from a part of IEC 60479-5 that relates to shocks that are only from hand to foot (not one hand on car to another hand on a fence rails), and assumes skin contact areas of 12cm2 or less (if that sounds like a large area, it isn't,  it is a total area of skin a touch over 2 inches by 1- gripping a typical door handle creates a substantially a bigger contact area for all but the most childish hands. Even on a small child a wet footprint is  a larger area)

It is a voltage which may work better for the largest typical bare part of a painted lamp post or traffic lights working in earth return mode on a dry day.


Also statistically there are about 7.5 million lamp posts on the road today *, vs 32 million cars and 4 million vans and half a million lorries. Of course only quarter of a million of those are currently electric, but the car hazard could  become quite a bit more common than the lamp post.


*I agree the lamp posts are slower moving..