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  1. antonino

    MH lamps harmonics

    Mainly cable heating, that was detected by the client's electrician ( wiring by trays). However, the installation is working well, cable capacity was checked (derating included) and is more than the rms value measured and CBs did not trip, but the client is concerned about the heating effect...
  2. antonino

    MH lamps harmonics

    We have a site with metal halide lamps connected and after current measurements, we found that the 3rd and 5th harmonics are about 13% meanwhile harmonics 11 and 13 are more than 30%. As all know, lamps are connected as single phase loads at 277VAC for total load of 6kVA per each phase (480...
  3. antonino

    conformal coating for harsh enviroment

    Hi This is what one supplier told me "We have contacted the manufacturer of the resin (urethane)used in the ( spray can P/N ). Unfortunately, they have no testing data for compatibility of the cured resin with the 3 corrosive gases we discussed: hydrogen sulfide, sulfur dioxide, and ammonia...
  4. antonino

    conformal coating for harsh enviroment

    One vendor said acrylic would be great and another one suggested urethane or silicone. I am asking now for test or references from them. rgds
  5. antonino

    on-line emergency lighting

    thanks for your replies Keith: Sorry it was my fault, I did not give full details. Each inverter have two static switches, one on the inverter output (always running)and one on the bypass line (480 vac from a transformer feeding an electromech. voltage regulator). On-line means loads always...
  6. antonino

    on-line emergency lighting

    hi for a local hydroelectric facility, we have supplied several on-line inverters (15kva, 277) for emergency lighting. Four years after the start-up, the real 125V dc load has reached a value greater than the design and the problem is that these inverters are feeded by the 125vdc substation...
  7. antonino

    conformal coating for harsh enviroment

    hi could please suggest the best coating material (acrylic, urethane or others)for a printed circuit board, in fact a battery charger controller board, in a refinery app. which is known for the content of H2S, SO2 and NH3. thanks and rgds
  8. antonino

    MV motor dropped

    hello a MV 450hp 4.16kv motor was dropped at the client, site. Both endshields were broken, sleeve bearings too. Rotor and shaft look good. Do you think that the motor shop could just replace the damaged parts, makes tests and the motor will run fine.? I apologize if this is a trivial...
  9. antonino

    200A standard recovery diode 1/2" thread

    IR PNs have been discontinued and other manufacturers have the same capacity but with 3/4" thread or metric size.
  10. antonino

    200A standard recovery diode 1/2" thread

    good day I am looking for a replacement diode or supplier for IR P/N: 200HF120PV and 200HFR120PV. Since we have a lot of rectifiers in the field with this diode and its 1/2" UNF 20 thread, which is a must for us. If anyone can help, I appreciate that. Thanks.
  11. antonino

    NFPA 70 visual torque indicator

    hi could anyone provide more info on the subject. Specs for a UPS request that for its terminal connections. rgds

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