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Eiko t8 led typeB

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    #46
    I've always been under the impression that fluorescent ballasts have outputs up to 600v OC.

    Added: http://www.electrical101.com/fluorescent-ballasts.html
    Master Electrician
    Electrical Contractor
    Richmond, VA

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      #47
      180429-2206 EDT

      LarryFine:

      For a cold cathode tube, mono end electrodes, it takes a relatively high voltage, 600 to 1000 V, to initiate ionization of the gas. After initiation of ionization, then the arc voltage drop is relatively low. The power source to the tube must be of a current limiting nature. High leakage inductance in the transformer.

      Once a tube has been initiated the mono electrodes become fairly hot from tube current and the initial breakdown voltage per half cycle becomes less.

      In tubes with two pins per end and a small heater electrode at each end, the earliest fluorescents, a preheat circuit including what was called starter was used to lower the initial breakdown voltage.

      .

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        #48
        Originally posted by gar View Post
        In tubes with two pins per end and a small heater electrode at each end, the earliest fluorescents, a preheat circuit including what was called starter was used to lower the initial breakdown voltage.
        I have plenty of experience with starter-equipped fluorescent lights, and even have modified them with momentary switches to eliminate the starter. N.O. push-buttons to start the lights, and N.C. to extinguish them.

        I've been doing electrical work for fifty or so years. I'll be 63 next month, and I did my first service upgrade when I was 15. I added a generator and T/S years later, and critiqued my own work. Proud to say I did everything correctly.
        Master Electrician
        Electrical Contractor
        Richmond, VA

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          #49
          Originally posted by Mparn View Post
          Our building were built in 1988 and 1999. Thanks for the info on the magazine, I'll look into that.

          Kinexis, are you concerned with 277 at the sockets?

          no, i would put warning stickers on them though. say something like "DANGER 277Volts at tombstones, site policy is to de-energize light before servicing", or "De-energize or light will be damaged when servicing".

          and also make sure everything is rated for it, the wire may be good at the high voltage only for start-up and not for continuous operation at the voltage i don't know though, just throwing it out there because i would look into it if i was going to do that

          i always thought you should de-energize a light when changing lamps anyways, when you put it in unless you do it perfectly you can connect and disconnect and then reconnect which i think is very hard on lamps of any kind especially new ones. plus there hot and you might be more likely to drop it.

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            #50
            Update on our project.

            Starting in February and completing in July, we have replaced approx. 5,000 lamps and decamped around 2,000. I know its early but here are some notes from the project.

            Everyone seems to like the overall quality, consistancy, and level of lighting. It seemed a little bright for some at first, most of those rooms had several lamps out.

            We've had a few issues; 1 lamp went bad, 2 lamps where the wire came loose, and 1 lamp was not put in correctly.

            Our district has avgerged around 1.6 mil kWh per year over the last 3 years. We are on pace to end the year at 1.2 mill kWh. That should be around $40,000 in savings. I also adjusted the summer HVAC schedule, which also played a role in reduction.

            Over the next month I will be replacing the exterior lighting. This includes; shoeboxes, flood lights, and wall packs. Each exterior fixture will have it's own surge protector.

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              #51
              Is there an update to this project? I work for a large school district and one of our new electricians ordered a lot of tombstone kits and type B lamps. We have never done type B lamps due to the mains voltage at the tombstone (non qualified personnel routinely are in the fixtures). Has this ever been a liability concern, safety issue or as a code issue and are we violating the UL listing by modifying the fixture with separate components vs a kit? Any input would greatly appreciated before we change direction in our retrofit program.

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                #52
                The first thing I want to know is why there are unqualified people opening these fixtures?

                Most kits that I have seen come with stickers that need to be installed but these are 120v units.
                They say I shot a man named Gray and took his wife to Italy
                She inherited a million bucks and when she died it came to me
                I can't help it if I'm lucky

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                  #53
                  [QUOTE=Dennis Alwon;1995138]The first thing I want to know is why there are unqualified people opening these fixtures?"

                  Because they cost less than qualified.

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