Author Topic: Wiring Diagram for a 2 lamp, F20T12 preheat striplight  (Read 3503 times)
lightman64
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Wiring Diagram for a 2 lamp, F20T12 preheat striplight « on: May 24, 2009, 06:20:05 PM » Author: lightman64
Anybody have a Wiring Diagram for a 2 lamp, F20T12 preheat striplight?
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icefoglights
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Re: Wiring Diagram for a 2 lamp, F20T12 preheat striplight « Reply #1 on: May 24, 2009, 09:19:35 PM » Author: icefoglights
one 2-lamp ballast or two 1-lamp ballasts?
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lightman64
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Re: Wiring Diagram for a 2 lamp, F20T12 preheat striplight « Reply #2 on: May 25, 2009, 08:59:26 AM » Author: lightman64
two, one lamp ballasts
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Re: Wiring Diagram for a 2 lamp, F20T12 preheat striplight « Reply #3 on: May 25, 2009, 12:22:48 PM » Author: Medved
Are serial reactor ballasts available for this lamp for your mains voltage? Or only autotransformer types?

Serial reactor:
Line to one ballast terminal
Second ballast terminal to one pin at one tube end.
Neutral to one pin at the other tube end.
Starter (and/or starting switch contact for manual preheat) is connected between remaining lamp pins (each at each end)

Autotransformer:
Line to ballast LineInput tap (would be marked on the label and/or would have a color corresponding to phase - US color code i don't know)
Neutral to Neutral end of ballast winding and one pin on one lamp end
Ballast lamp output end to one pin at lamp's other end
Starter (and/or starting switch contact for manual preheat) is connected between remaining lamp pins (each at each end)
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Re: Wiring Diagram for a 2 lamp, F20T12 preheat striplight « Reply #4 on: May 25, 2009, 12:37:17 PM » Author: lightman64
What is the difference? I have two GE preheat ballasts for 14,15,19 0r 20 watt lamps, tow starter sockets and the old ballast.
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Re: Wiring Diagram for a 2 lamp, F20T12 preheat striplight « Reply #5 on: May 25, 2009, 02:05:44 PM » Author: Medved
What is the difference? I have two GE preheat ballasts for 14,15,19 0r 20 watt lamps, tow starter sockets and the old ballast.

Reactor has only two terminals (as it is only a simple choke), it's only purpose is to regulate the lamp current by inserted "ballasting" impedance in series with the load (lamp arc). It is the simplest and most efficient form of the ballast and as such could be used, when the mains voltage is at least about twice the lamp voltage (230V for all lamps i know, 120V for some low wattage only - the F20T12 should fall in this category).

The autotransformer has three terminals - neutral (primary end of winding), line input (usually the tap between primary and secondary) and lamp output (the secondary winding end), while the leakage inductance between both sections is used as ballasting impedance. Beside of the current limiting function it increases the open-circuity voltage, to be roughly twice the lamp arc voltage. It is necessary, when the lamp arc voltage is more then about half of the mains, so simple choke could not be used (120V for all, except of low, wattages).
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icefoglights
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Re: Wiring Diagram for a 2 lamp, F20T12 preheat striplight « Reply #6 on: May 26, 2009, 12:21:52 AM » Author: icefoglights
All preheat ballasts I've seen for 15-20 watt lamps are serial reactor ballasts.
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lightman64
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Re: Wiring Diagram for a 2 lamp, F20T12 preheat striplight « Reply #7 on: May 27, 2009, 10:30:00 AM » Author: lightman64
ok, a wiring diagram for a 2 lamp, (2 ballasts) F20 T12 preheat striplight W/ serial reactor ballast
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Re: Wiring Diagram for a 2 lamp, F20T12 preheat striplight « Reply #8 on: May 27, 2009, 03:08:51 PM » Author: Medved
ok, a wiring diagram for a 2 lamp, (2 ballasts) F20 T12 preheat striplight W/ serial reactor ballast

Copy following "text" into some fixed character-width text editor (Notepad if you use MS Windows, KEdit if KDE in Linux,...) and you get an ASCII picture of the schematic of 2 lamp NPF preheat ballast:


                 Ballast1
                 --------
   Line  O--*----^^^^^^^^--------   ----
            |                    | |    |
            |                   -----   |
            |                  |     |  |
            |                  |     |  |
            |                  |     |  |  ------------
            |                  |  L  |  | |            |
            |                  |  A  |   -|            |
            |                  |  M  |    | Starter1   |
            |                  |  P  |   -|            |
            |                  |  1  |  | |            |
            |                  |     |  |  ------------
            |                  |     |  |
            |                  |     |  |
            |                  |     |  |
            |                   -----   |
            |                    | |    |
            |   -----------------   ----
            |  |
            |  | Ballast2
            |  | --------
             --+-^^^^^^^^--------   ----
               |                 | |    |
               |                -----   |
               |               |     |  |
               |               |     |  |
               |               |     |  |  ------------
               |               |  L  |  | |            |
               |               |  A  |   -|            |
               |               |  M  |    | Starter2   |
               |               |  P  |   -|            |
               |               |  2  |  | |            |
               |               |     |  |  ------------
               |               |     |  |
               |               |     |  |
               |               |     |  |
               |                -----   |
               |                 | |    |
 Neutral O-----*-----------------   ----


« Last Edit: May 27, 2009, 03:14:23 PM by Medved » Logged

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lightman64
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Re: Wiring Diagram for a 2 lamp, F20T12 preheat striplight « Reply #9 on: May 27, 2009, 04:09:33 PM » Author: lightman64
Thanks!
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