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

Topic Options
Rate This Topic
#15455 - 10/18/02 04:26 AM Huge amount of Christmas Lights
ctolbert Offline
Member
Registered: 08/09/01
Posts: 31
Loc: Cumming, GA USA
I feel like I'm in that movie "Christmas Vacation." I was thrown a project that is huge and already started. I would love some comments about the direction it's heading.

--64 light strands (700 watt 120vac incandecent)
--600 amp feeder with 16 x 30 amp breakers allocated for above strands.
--4 strands per breaker
--each strand controlled on/off with 10 amp omron micro relay with a 2 times a second switching rate.
--relays controlled by plc in predetermined pattern.

My biggest concern right now...is the switching speed and the inrush from the lamps as they are switched.

Any comments would be appreciated,

Thanks,
Carl
_________________________
Carl Lee Tolbert
Technical Support
AC Drives
Automationdirect.com
Your source for the most practical automation products at almost-free pricing, delivered by 11 a.m., just by clicking a mouse.
PH: (770)844-4200
Fax:(770)886-3199
www.automationdirect.com
Top
Work Gear for Electricians and the Trades
#15456 - 10/18/02 09:38 AM Re: Huge amount of Christmas Lights
Pearlfish Offline
Member
Registered: 09/12/02
Posts: 83
Loc: Chicago Ridge, Il, USA
If the inrush becomes a problem, have your programmer input a 20+ millisecond delay into selected rungs. It will be almost imperceptable to the eye. If you have a large number of rungs, the lights will "sweep" on and still look nice!

[This message has been edited by Pearlfish (edited 10-18-2002).]
Top
#15457 - 10/18/02 12:36 PM Re: Huge amount of Christmas Lights
Scott35 Offline

Broom Pusher and
Member
Registered: 10/19/00
Posts: 2707
Loc: Anaheim, CA. USA
Interesting subject!!!

Could you add some more data so we can have a better understanding of everything?

Stuff like System type [1 phase, 3 phase], exact rating of each lamp [or lamps if various types], inrush level or cold Resistance level, flashing in sequence, randomly or all at once, overall length of circuits / feeders / subfeeds, available KVA, switching relay's duty rate and other specs, and do the lamps have to be at 100% intensity when on, or can they drop to 90% intensity.

Scott S.E.T.
_________________________
Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
Top

Member Spotlight
Member Since: 02/23/13
Posts: 204
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
0 registered (), 48 Guests and 12 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
KrmtFrg, Stack, Scotto, Freecrowder, clee512

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