ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

Topic Options
Rate This Topic
#173886 - 01/21/08 07:03 PM Streetlighting Innovations?
Text Offline
Junior Member
Registered: 05/07/04
Posts: 16
Loc: Lipa City, Philippines
What is the maximum lenght of your feeder on streetlight from the KWHmeter? Using 230V; single phase

given the ff data.

a)250W metal hallide - (what is the max/min spacing and height)

b)23W compact flourescent lamp( mostly spherical parklamps)

any innovations?
Test Equipment:
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement
#173888 - 01/21/08 08:03 PM Re: Streetlighting Innovations? [Re: Text]
SolarPowered Offline
Registered: 07/05/04
Posts: 625
Loc: Palo Alto, CA, USA
Originally Posted By Text

any innovations?

Well, the astronomy guys would really like it if you use low-pressure sodium lights, because they can filter out the sodium line. Anything resembling a white light pretty much blinds telescopes by lighting up the night sky.

I don't know if that's the sort of "innovation" you were looking for. wink
#173892 - 01/22/08 02:07 AM Re: Streetlighting Innovations? [Re: SolarPowered]
Registered: 12/08/05
Posts: 854
Loc: Titirangi, Akld, New Zealand
We use streetlights at 230 - 240 Volts in New Zealand.

They are connected in strings via a contactor and 32 A mcb.

Substation control via lightcell and loadshedding relay drives contactor, string of 10 to 15 lights 250 Watts etc.

Cable runs in new areas are 500 to 1000 metres with 10 mm² neutral screened cable, feeding about 15 poles ( In 15 Ampères )

In older areas of town 2.5 or 4 mm² cables were run up to 600 metres in length feeding 6 or 7 lamps HPS 85 Watts. In 3 to 4 Ampères.
The product of rotation, excitation and flux produces electricty.
#173906 - 01/22/08 09:52 AM Re: Streetlighting Innovations? [Re: RODALCO]
Zapped Offline
Registered: 10/01/02
Posts: 482
Loc: Huntington Beach, CA, USA
If I'm understanding your question...

The minimum/maximum distance is calculated in relation to the height of the poles and fixtures. You need to define one of the variables in order to calculate the other, and all of this information should be based on the parametric specifications of the specific fixture.

Most lighting manufacturers provide this information for each fixture they have on the market for the design questions you are putting fourth in this forum. Often this information is available on the manufacturers web site, in the form of a .pdf file that can be downloaded. If the job is big enough, the manufacturers will usually be happy to assist you in design of your installation.

250W Metal Halides, in my experience, are usually coupled with 15'-20' poles. Commonly 20'.

A 23W CFL "lollipop", or spherical type globe fixture, is rarely placed above 10', as the low light output would be useless above this height (the fixture would glow, but not project useable path lighting).

Once you figure out how many fixtures will be needed and the total length of the run, total amperage, etc, you can calculate wire size, power requirements, number of circuits, control options, etc.

Good Luck!
#174158 - 01/27/08 09:36 PM Re: Streetlighting Innovations? [Re: Zapped]
Text Offline
Junior Member
Registered: 05/07/04
Posts: 16
Loc: Lipa City, Philippines
Hi Solar P.

I forgot where i read it... but is there a study that white light is not prone to rosd accident?..
#174415 - 02/04/08 10:40 AM Re: Streetlighting Innovations? [Re: Text]
rmiell Offline
Registered: 11/09/00
Posts: 242
Loc: La Junta, Co. USA
I don't have any links, but I recently read an article about the town of Holly, Colorado USA that was wiped out last year by a tornado. Town being rebuilt, and the power supplier XCEL is donating LED street lights. XCEL dosn't even supply power to this area, yet they are helping out.

A google search should turn up new ideas for streetlighting.

Rick Miell

Member Spotlight
Member Since: 04/03/02
Posts: 6778
New in the Gallery:
SE cable question

2017 NEC and Related
2017 NEC
Now Available!

Shout Box

Who's Online
1 registered (HotLine1), 61 Guests and 10 Spiders online.
Key: Admin, Global Mod, Mod
New in the Gallery:
SE cable question
Top Posters (30 Days)
Admin 47
HotLine1 43
gfretwell 19
Ruben Rocha 12
Trumpy 9
Newest Members
Scotto, Freecrowder, clee512, Jdscott2005, FAIZAN

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals