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  1. Tha fios agaibh

    Puzzling problem with sensor and flickering lights

    I suspect you might be using the wrong type sensor. Some don't play nice with led lamps. Some sensors are designed not to activate during daylight conditions (..and will flicker when light from overhead fixture reaches it). Make sure you use a sensor designed for your specific application. I...
  2. Tha fios agaibh

    Operating 266V Motors on 230V..... Explain Please

    This is a three phase motor designed to have the windings wired either 460v wye, or 266v delta configuration. There is no single phase, but internally each winding will see 266v. 460/1.732(sqrt of 3)=266v But I agree, it could be ran at 480 3ph which is only 4.5% over voltage. Better to run...
  3. Tha fios agaibh

    Operating 266V Motors on 230V..... Explain Please

    I wouldn't run them at 230v other than briefly with minimal loads. Besides lowered performance, the internal cooling will be inadequate and shorten its life. Best to just buy a frequency drive (VFD) to drive it. Another consideration is the voltage tolerance of the internal brake rectifier that...
  4. Tha fios agaibh

    Old Resistors

    Red or brown would have me scratching my head without my trusty meter.
  5. Tha fios agaibh

    Old Resistors

    Yes, Me too but i was wondering if there was a helpful clue like the 1st stripe being closer to the left. I guess not. Although sometimes I've noticed a slight space between the last two bands that makes it evedent.
  6. Tha fios agaibh

    Old Resistors

    I agree it's 2.7Ω 10%, but it raises a good question. What determines the first band from the last? In this case its obvious that silver is the tolerance band because it can't be a selection for the first band. Is it the fact that the first band is closest to the left hand side, or because the...
  7. Tha fios agaibh

    SCR S838

    Right again duke37.
  8. Tha fios agaibh

    SCR S838

    Ahh, good point duke37. The mounting tag is connected internally. Center pin must be the cathode because the heat sink is neg.
  9. Tha fios agaibh

    SCR S838

    Kevin, You can use an analog ohmeter or continuity tester to test a scr. I prefer to use a flashlight type continuity tester because it has two batteries and will output 3v to trigger larger scrs. The Cathode (K) needs to go to neg lead, Anode (A) will go to positive lead, and then briefly...
  10. Tha fios agaibh

    Radio Shack multimeter.

    You could get it here https://m.alibaba.com/product/915396269/Original-New-IC-TCR6022.html That will take weeks to ship and a chance it doesn't arrive at all. Or you can just buy a new similar meter for under $20.
  11. Tha fios agaibh

    What polarity is this?

    I've never tried this before but; If you can put your meter test leads on the both inner and outer pins you can read polarity. There is a switch that switches it from battery to Adapter power when pushed, but it should normally be in the battery position (adapter not plugged in). This...
  12. Tha fios agaibh

    GE 24" Double Wall Oven installed with Jbox touching the back panel

    I can't speak specifically to your plan because their are too many variables. For instance; If the receptacle box is fed with nm into a plastic box, you can't use FMC cable. (There is no such thing as "flexi"). The existing BX cable is obsolete and its nearby cousin, MC cable is often used in...
  13. Tha fios agaibh

    GE 24" Double Wall Oven installed with Jbox touching the back panel

    Box looks like a 4 11/16" square by 2 1/8" deep. It could be changed to a box that's 4 11/16" by 1 1/2" deep and still be within acceptable box fill rules. There shouldn't be any tape between the BX cable and the fitting in the box. The cable also needs to be clamped with 12" of box and within...
  14. Tha fios agaibh

    GE 24" Double Wall Oven installed with Jbox touching the back panel

    Yes, its dangerous because it will melt the wires in the box and cause a short. You don't want direct contact between oven and box. The box can be recessed but the cover needs to be accessible. It can be anywhere behind the stove. I'd advise against putting it low to the floor in case there's a...
  15. Tha fios agaibh

    Calculating lamp plus ballast power usage

    The info is out there for the taking (internet or light manufacture), but I'll answer part of your question. The ballast load is not included in the total wattage used in a fixture. For example; a 400w mh lamp will draw about 1.4 amps at 277 volts mathematically (400/277) but in reality it...
  16. Tha fios agaibh

    T8 - LED shop lighting

    Right And, both T8 and T12 use the same socket configuration so you can retrofit both types of fixtures with the T8 led.
  17. Tha fios agaibh

    12v Step-down?

    You didn't spicify amperage but; Look at a lm7809 for 9v, or a lm317 for variable.
  18. Tha fios agaibh

    Transformer primaries in series, secondaries in parallel -- ok?

    As an electrician we parallel separate transformer secondaries all the time provided they are the basically the same. As Steve explained at the top of this page, circulating currents can become a problem when the PRIMARIES are wired in series. But with that said; If the loads are roughly the...
  19. Tha fios agaibh

    Solar astronomy taken to a new level for me

    @kellys_eye; I don't think nightless days would have as much an impact as something like wide temperature swings or perhaps solar winds interfering with their atmosphere. Obviously, the concept of day and night and years would be radically different than we know it. Truly mind blowing stuff...
  20. Tha fios agaibh

    Transformer primaries in series, secondaries in parallel -- ok?

    Thanks Steve. Of course there would be no problem if the primaries were also in parallel.
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