Street Lighting

[WhittWhitt]

Hello All

Basically i have a interview in a week and i need to have a understanding of how street lighting is wired, could someone please give me a idea of the basics and a drawing would be fantastic

Thanks in advance


Matt

 

[RF Lighting]

It depends.

Is it public or private street lighting systems that you want to know about?

 

[WhittWhitt]

Hi,

It will be for public street lighting

Thanks

 

[mattylad]

In that case - in Lancashire its some old wires with no electricity running through them - because they have been turned off

 

[oasistechnical]

basic really;

concentric in and out of cutout in base
then, depends on age of pole,
to control photocell (or time switch) and then either to base fitted control gear for discharge lamp
or up the pole in double sheath singles (small version of meter tails to the head

if you can do discharge lighting and know the faults, you should be ok

the usual ones are;
lamp cycling, coming on, getting bright, flickers for a bit then goes out, thats lamp failure!

lamp trying to start, HPS/HQI, can be lamp or ignitor failure, depending on lamp size

LPS low pressure sodium, be careful with these lamps as they have pure sodium metal within the discharge envelope,
giving reddish, and no yellow light emitted, failed lamp, flickering, failed lamp/ignitor

lamp always on, usually photocell failure, change em, standard NEMA socket, you cant fit these wrong as they only go in one way,

don't mix your photocells either as one type are for side roads and one type are for main roads, A roads etc, switch on times are not the same

cant remember the LUX levels off of my head at the moment.

so i hope this helps,

oh and don't forget you CPC always to base of pole and top of pole!!

Oasis

yep i know i am and alarm engineer but i do do electrical works but NOT domestic!!!and am fully qualified in what i do.

 

[bernardgreen]

Some experience from designing a current monitoring system for street lighting intended to detect vandalism.

A feed from the network into a street cabinet located at a round about. Lux sensor on a pole adjacent to the cabinet. 12 MCBs and ( if I recall correctly ) 12 contactors for 12 redials out to the lights.

A radial would typically feed several hundred yards along one side of a road, the other side would have its own radial. Each of the four pedestrian under-passes had its own radial from the cabinet. I seem to recall these were permanently on and not lux controlled.

( the current sensing system worked but a vandalised fitting could be dark but still take the correct amount of current so as a detection of vandalised fittings it was not reliable. )

Supplies are not normally metered. The cost is based on number of lamps and their total nominal power and the number of hours they are in use. The number of hours is determined if a time clock is used or estimated if lux control is used. Time clocks may be "solar clocks" which automatically vary the ON and OFF times to match the sun set and sun rise times through the year.