On Wednesday, 26 December 2018 18:01:05 UTC, Chris B wrote:
On 26/12/2018 17:05, Tufnell Park wrote:
On 26/12/2018 16:24, Chris B wrote:
I have just been out to walk off at least part of the excesses of the
last couple of days and came across a street lamp with its access
panel missing.Â* A photo is here.

https://www.dropbox.com/s/fj3m471n4u...4906a.jpg?dl=0

This looks like a single street lamp unit is protected by a 32A CB.

1) I would have thought the rating for a single bulb would be lower.
(what are street lamps 400W?).

2) Some have said (even on this NG), that its impractical to have a EV
charging point on street lamps as they don't have the current carrying
capacity. Now 32A might not effect a "fast charge" but could
significantly increase the battery charge if left plugged in all day
(or all night).


Any thoughts?


The CB is rated to protect the cabling to the lamp. It is unlikely to be
a 400w lamp, sodiums are usually around 80w.

OK so supplementary question, why use cable capable of 32A to run up a
pole with an 80W lamp at the top. Repeated on many, many posts would
this not lead to considerable unnecessary expense, compared with running
say 5A cable?

--
Chris B (News)

The last street lights I wired had 5a fuses and 10a rated cable.

On 27/12/2018 13:28, harry wrote:
On Wednesday, 26 December 2018 18:01:05 UTC, Chris B wrote:
On 26/12/2018 17:05, Tufnell Park wrote:
On 26/12/2018 16:24, Chris B wrote:
I have just been out to walk off at least part of the excesses of the
last couple of days and came across a street lamp with its access
panel missing.Â* A photo is here.

https://www.dropbox.com/s/fj3m471n4u...4906a.jpg?dl=0

This looks like a single street lamp unit is protected by a 32A CB.

1) I would have thought the rating for a single bulb would be lower.
(what are street lamps 400W?).

2) Some have said (even on this NG), that its impractical to have a EV
charging point on street lamps as they don't have the current carrying
capacity. Now 32A might not effect a "fast charge" but could
significantly increase the battery charge if left plugged in all day
(or all night).


Any thoughts?


The CB is rated to protect the cabling to the lamp. It is unlikely to be
a 400w lamp, sodiums are usually around 80w.

OK so supplementary question, why use cable capable of 32A to run up a
pole with an 80W lamp at the top. Repeated on many, many posts would
this not lead to considerable unnecessary expense, compared with running
say 5A cable?

--
Chris B (News)

The last street lights I wired had 5a fuses and 10a rated cable.


Time and place might actually be of use. If in outer Mongolia 1974, it
may well have been cutting edge.