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I am due to design a full Circadian Rhythms Illumination System within a Human Behaviour and Sleep Disorders Researching Center in UK, and I have been tasked the duty to investigate the market for a full spectrum Driver / LED / Luminaire that would offer a continuous tuning of the spectrum from...

Thanks jghrist. I didn't found the Omaha part of it (only "sweet fudge"...), but the "fudge factor" is well known. I will go for the 450KVA, then. Best regards. Giuseppe

Hi T83, correctly, the NFPA 780 is good, but the best available is presently the new IEC EN 60305. Also, some API standards related to the matter will help. Finally, for sensitive equipment, specifically telecom, I will suggest to see the ITU, particularly the K27. May I suggest you to join...

Hi to all. I have a question that maybe simple for some of you guys. I have to supply a transformer with a cable (primary) sized for three loads (secondary) of 150KVA two-phases resistances @ 400Vac phase-to-phase. What will be the resulting, effective load on the Primary, as to size the...

Hi Unclebob and zogzog, thanks for your reply. The breaker is a Moulded Circuit Breaker, and as I have to supply from the breaker three individual single phases (Phase plus Neutral), I am unsure what the behaviour of the tripping device will be if one or two of the phases will be switched off...

Hi to all. I have a simple question that may have a complicated answer: when testing a three phase Circuit Breaker with a single phase Current Injector, what will happen if the test is carried out only on one pole (line-in/line-out). I am presently far away from a laboratory and I cannot carry...

Hi to all. thanks for the useful information. I will see how better use them then. Great to know that you are out there, indeed... Best regards to all. Giuseppe

Hi to all. I am presently involved in a project where lot of RTD's (Resistance Thermal Devices) are installed on field equipment, particularly on transformers and electrical motors windings. As I am preparing the Cable List for the whole field, is there any specific requirement for the cables...

Thanks Slava, I cannot find the other posts as they are shortened as CT... how dummy of me! I think it is quite fine what you say, so i will take it for good. Much appreciated indeed. Kind regards. Giuseppe

Hi to all. I have an issue on the earthing (or grounding) at the secondary of Current transformers. Generally speaking, the Primary of a Current Transformer is marked P1 and P2, with P1 normally being positioned where the Current enter the Transformer and P2 at the exit. Accordingly, S1 (or...

Hi Theblacksmith, unfortunately, the approach you stated appears to be the typical approach that possibly leads to disasters. When a seller is leading the choice of a generator, he will invariably try to sell the most expensive stock, regardless to the efficiency and reliability required, as we...

Try Hevacomp if in Europe.

Hello there. Is anybody aware of the latest Graphic Symbols for Schematic Diagrams and drawings from the British Standards? I looked in several Standards Libraries but I cannot find the relevant Standard Number. I would just need the Standard Number (current one) or the proper denomination...

I often found that the joint itself is the strongest point within the HV Line (if properly done, of course...!). The limitation of joints in a line is due mainly to an increased possibility of human errors when doing the joints... Verify that the semiconductor materials are properly repaired...

Check the lenght of the coil wires and you'll find the answer. Two bobins should be shorter than one. Regards. Giuseppe

Thanks to all for the answers. I have now sorted the problem. It's great to be part of a forum as this, and I sincerely wish to thank you all for the time spent in answering. All the best. Giuseppe

Hi to all. I wonder if anyone there has a "rule of thumb" to calculate the Heat generated by a Panelboard. I can't remember the formulas and I am presently out of books reach...! Thanks to whomever wishes to help. Giuseppe

Dear all, interesting question dictated by the present emotions :-) One important question I always had, and that upset lot of people generally, is as follow: "had the proper Testing/Pre-commissioning/Commissioning activities carried out?" Testing: is to verify ON SITE that the...

In a TN system the Neutral is normally treaten as phase conductor, and for that shall be isolated TOGETHER the phases. The TN-C-S system is expecting the Neutral to be also the Protective Conductor, and so shall not be isolated. Four poles Breakers are bigger, more expensive, and normally...

Have you tried the Pirelli Cable site? Quite useful. Cheers