ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Air Compressor feeder conductor sizing
by Potseal. 01/15/18 09:08 PM
VDE 0100 to introduce AFCIs
by LongRunner. 01/15/18 11:38 AM
Under carpet cable?
by HotLine1. 01/15/18 09:57 AM
Any New Years Resolutions?
by Bill Addiss. 01/13/18 10:21 AM
New in the Gallery:
Housebilding DIY wiring
SE cable question
Who's Online Now
1 registered members (andey), 10 guests, and 7 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
H.I.D.lighting start up current inrush #128447
03/19/03 03:35 AM
03/19/03 03:35 AM
P
payday  Offline OP
Junior Member
Joined: Mar 2003
Posts: 1
u.k.
Can anyone tell me what the startup inrush current of a 400w lowbay metal halide would be running on 240v.

I've been trying to find this out for a while.

Tools for Electricians:
Re: H.I.D.lighting start up current inrush #128448
03/19/03 05:58 AM
03/19/03 05:58 AM
Joe Tedesco  Offline
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
Try this, I didn't look through the pages for the specific answer to your question, but felt that this information would be helpful.

Perhaps someone will have the time today to review the mateial here.
http://www.cleanaircounts.org/resource%20package/A%20Book/EE%20Lighting/manual/technolo.pdf


Joe Tedesco, NEC Consultant
Re: H.I.D.lighting start up current inrush #128449
03/19/03 09:09 AM
03/19/03 09:09 AM
S
sabrown  Offline
Member
Joined: Dec 2002
Posts: 302
Ogden, Utah, USA
In looking at Lithonia's Metal Halide 480 VAC Ballast Data the starting current ranges from .4 to .85 amps depending on the ballast with an operating current of 1 amp. I will have to look at the above paper mentioned by Joe to see if there is any difference with an in-rush figure as in-rush could be significantly different and you probably already know the figures I gave above.

Re: H.I.D.lighting start up current inrush #128450
03/21/03 05:01 AM
03/21/03 05:01 AM
Scott35  Offline

Broom Pusher and
Member
Joined: Oct 2000
Posts: 2,708
Anaheim, CA. USA
Transient Inrush on most Reactive devices like these Ballasts would range from 400% of rated high-end current, to as much as 1000% of high-end current. Time frame would be maybe for only 10-20 cycles for highest draw, tapering down to like 200-300% by the time a full 60 cycles has passed.
I need to check into this and verify data, but it "seems" this would be accurate.

The use of Inverse Time Trip Breakers or Time Delay Fuses is important here.
MCCB with the notation of "HID" usage have this characteristic, plus offer "Switch" duty and designed to deal with quenching a more stable arc, from opening HID Ballasts' circuits during operation.
I'll paste some data regarding HID duty MCCBs later.

Basically, the inrush should not normally trip a properly designed circuit - unless there is component failure or some Ballasts are Resonating the circuit big time (Capacitors mix-matched or incorrectly connected to Reactor Core/Coils, causing hard starts), or there are simply way too many Ballasts on a circuit.

Keep circuits from being max'd out, plus compensate for long circuit runs by upsizing conductors.

Another concern is bouncing harmonics around a 4 wire wye multiwire circuit, where ØA, ØB and ØC have an odd number of different type HID Ballasts. Could result in very wierd initial inrush levels.

Let me verify all this stuff first, then get back with conclusions.

If you are looking for Highest Starting Current / Highest Load Current for the Ballast, this is totally different than what has been listed above!

Ballast for a normal "Probe-Start" M59 Lamp (400 watt Metal Halide Probe Start Lamp) would be a common Constant Wattage Autotransformer configuration (CWA). These have an almost unchanged input line current level from when the arc is first struck across the tube (starting), to driving a stable lamp's full output (running).

Input KVA is adjusted to fit per available voltage levels (within a small tolerance, usually within 10% +/-).

For an ANSI M59 driven by a properly connected and functioning CWA Ballast, the high line current at 240 VAC would be 2.0 Amperes - unless the circuit's power factor is offset (shorted capacitor), then would be more in the 4.0 or higher range!

Properly functioning Ballast would have an apx. power factor of 0.8334 (83.34%), or simply one Ampere per 100 watts, per 120 VAC

(400 watt lamp @ 120 VAC: 4 amps, 400 watt lamp @ 480 VAC: 1 amp, 250 watt lamp @ 120 VAC: 2.5 amps, 250 watt lamp @ 240 VAC: 1.25 amps).

That above example is not universal to all HID Ballasts, only a "Ball-Park" figure for CWA Ballasts.

If the lamp is a 'Pulse Start" type ANSI M135 Metal Halide, the high end current should be the same - 2.0 amps @ 240 VAC.

Hope this helps!!!

Scott35


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
Re: H.I.D.lighting start up current inrush #128451
03/21/03 05:07 AM
03/21/03 05:07 AM
Scott35  Offline

Broom Pusher and
Member
Joined: Oct 2000
Posts: 2,708
Anaheim, CA. USA
FYI,
Here's the Schematic for a CWA Ballast, which should be the one used to drive your M59 Lamp (400 watt Metal Halide Lamp):

[Linked Image]

If different than what is in your fixture(s), please let us know!

Scott35


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!

Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
HCE727
HCE727
Delaware County, PA, USA
Posts: 186
Joined: November 2005
Show All Member Profiles 
Top Posters(30 Days)
sparky 24
Admin 19
Potseal 13
Popular Topics(Views)
243,510 Are you busy
180,296 Re: Forum
170,800 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.156s Queries: 14 (0.134s) Memory: 0.9706 MB (Peak: 1.1105 MB) Zlib enabled. Server Time: 2018-01-16 13:34:04 UTC