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Artículos técnicos

Actualización del foro sobre arco eléctrico

Mantenimiento de disyuntores

17 de agosto de 2016

Apologizes if this topic is covered elsewhere in the forum. If so, please point me in the right direction. We are having some arc flash studies completed for buildings across our campus. The consultant is recommending that fuses be replaced with current limiting type fuses and also that breaker settings be dialed down to be more conservative. Adjusting our old breakers is something that we are nervous about doing and so I wanted some reactions from this group. I know

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Clasificaciones de series probadas y de ingeniería

15 de agosto de 2016

One more question about series ratings. NEC 240.86 addresses series ratings “Selected Under Engineering Supervision in Existing Systems” and “Tested Combinations” Please refer to last week’s post and NEC 240.86 for specific application details. Do you use “Engineered/Selected under engineering supervision” or “Tested Combinations” series ratings – Engineered/Selected under engineering supervision – Tested combinations – Both – None READ MORE

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Traslación de interruptores de media tensión: ¿existe?

10 de agosto de 2016

The question of the week on racking in medium voltage breakers got me thinking about this video: https://www.youtube.com/watch?v=rdQR7-Ap6YQ and what else could be done to prevent it from happening again. Yes, I know the guy was wearing insufficient PPE and should have had the door closed. I also know that in our newer gear where I work we have remote remote racking operators, fiber optic flash detection and tripping and the gear is designed differently to contain or re-direct an

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Clasificaciones de la serie NEC 240.86

9 de agosto de 2016

The National Electrical Code article 240.86 addresses series ratings with the following: Where a circuit breaker is used on a circuit having an available fault current higher than the marked interrupting rating by being connected on the load side of an acceptable overcurrent protective device having a higher rating, the circuit breaker shall meet the requirements specified in (A) or (B), and (C). (A) Selected Under Engineering Supervision in Existing Installations. The series rated combination devices shall be selected by

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IEEE 1584 – ¿Certificación requerida para productos/servicios?

1 de agosto de 2016

I have heard a rumour that IEEE1584 are up to their old tricks again. Back in 2012 it was to introduce royalties for use of the equations. This time I understand that the IEEE Standards Association are planning to require certification for the use of the next edition of IEEE 1584 in products and services with that Certification commanding an not unsubstantial fee for the certification. I have a number of issues with all of this. Technical Standards are firstly

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Novedades en estudios de arco eléctrico, cortocircuito y coordinación

1 de agosto de 2016

Hi. I currently work as an Engineer in the energy management field. I would like to branch off in to doing Arc Flash, Short Circuit and Coordination Studies. How would I go about doing this. I have been exposed to these reports but have never done them before. Would any of you happen to have any training material on how to get started? From what I’ve read I should learn how to do these reports manually then look in to

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ArcPro y Windows 10

1 de agosto de 2016

Has anyone found a way to run ArcPro on Windows 10? I cannot even install it on Windows 10. Not sure about any 3rd party programs that could emulate a earlier Windows version. FYI: I have sent 3 emails to the creators of ArcPro (Kinectics) specifically to Stephen Cress and it has been 6 weeks since the initial email with followups sent but I have not received a response. READ MORE

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Factor X para interruptores de desconexión

1 de agosto de 2016

Hello What is the optimal X factor for disconnect switches. I assumed it is 2 because that’s the default value that ETAP gives you. Am I correct for assuming this? Furthermore, It falls under the low voltage category (0.208-1), so it can be the value for MCC’s and panels which is 1.473. Which value is optimal for Arc Flash calculations? Thanks READ MORE

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PE/Certificación (trasladado del hilo de Certificación IEEE 1584)

1 de agosto de 2016

There is a long and well documented fight between the NSPE as the “political arm” of professional engineering and various industry groups which have all but made “industrial exemption” here to stay. And speaking from the other side, guess how much support there is in industry for getting that PE? Is there a pay increase or even funding (and time allotted) for taking classes? I’ll give you a hint…been there, done that. Furthermore, does hiring an engineering firm versus a

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Protectores contra arco eléctrico en cajas de desconexión

1 de agosto de 2016

I repair UL listed appliances that are sometimes directly wired into a fused or unfused disconnect box if they exceed 50A. Sometimes I need to test the voltage on both sides of the knife switch. The new boxes seem to come with shields on the “hot” side, with little holes so that I don’t accidentally short things out with my probes. That would be okay except that my probes are not long enough to make contact with anything when I

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