es_MX Spanish
es_MX Spanish en_US English
Mi cuenta
Brainfiller.com Logo Horizontal
Facebook Linkedin YouTube

Artículos técnicos

Actualización del foro sobre arco eléctrico

Actualización de etiquetas de arco eléctrico: ¿cuántas veces?

14 de noviembre de 2016

NFPA 70E requires that an Arc Flash Risk Assessment be updated when a major modification or renovation takes place. It shall be reviewed periodically, at intervals not to exceed 5 years, to account for changes in the electrical distribution system that could affect the results of the arc flash risk assessment. Countries outside of the US that do not use NFPA 70E may have a similar label review/updating requirement. NFPA 70E further states that where the review of the arc

Leer más "

Corriente máxima de cortocircuito

9 de noviembre de 2016

The intensity of an arc flash is dependent on the magnitude of short circuit current. Lower voltage systems (less than 600 volts) tend to have the highest short circuit currents. Here is this weeks question: What is the maximum short circuit current that you have seen? less than 50 kA greater than 50 kA greater than 100 kA greater than 150 kA ANSWER

Leer más "

Usando guantes con un palo

7 de noviembre de 2016

1910.269 requires arc flash protection for hands with exceptions when wearing leather protectors over rubber gloves, and when wearing heavy duty work gloves. The workers state that sticks should be used bare handed, and that work gloves will contaminate the stick. Any advice on this topic? Leather gloves aren’t going to contaminate a hot stick unless for instance they get saturated in creosote or other materials. Granted there are tons of nasty, sticky materials in the utility work site and

Leer más "

Límite de arco eléctrico de CC

5 de noviembre de 2016

Could i use the (DB) empirically derived model equation of IEEE Std 1584-2002 to calculate the Flash-protection boundary (for box configurations) and the Lee (DB) equation (for open air configurations)? I can´t find a equation for DC Arc flash boundary. READ MORE.

Leer más "

Panel de 100 A con línea principal de 200 A “montada en canaleta”. ¿¡Qué demonios!?

2 de noviembre de 2016

Came across this today while surveying. The original drawing shows this panel with a 100A branch mounted main. Well, someone needed that breaker for another panel and removed it and installed this instead. Not in the photo: 4/0 feeder spliced inside an adjacent panel with #2. #2 goes through wireway to this 200A “gutter mounted” MCB which had been removed from the adjacent panel. Adjacent panel was re-fed from a different source. Sheesh! Oh, and the 4/0 feeder (and the

Leer más "

Mantenimiento de componentes de BT dentro del gabinete de AT

26 de octubre de 2016

Good Morning All, I am from the Safety Office and our organization prohibits working on electrical components/systems above 600V. I have a situation that I need advice on. Here is the background: There is a group of Electronics Technicians/Engineers who believes they are responsible of an electrical system just because it resides in their occupied building. Inside this building is an 15kV CB which disconnects a transformer bank 11.5kV:570V, 540V and an 8.32kV harmonic filter (in a cabinet) from the

Leer más "

Etiquetas de arco eléctrico RELT o ARM

25 de octubre de 2016

It always seems as if we are kicking the dead horse on arc flash labels but I was just interested in your opinion of how to label a piece of equipment which is fed from a circuit breaker with an Arc Flash Reduction Switch (ARMS) or Reduced Energy Let-thru (RELT) switch. We are currently performing a project with several new circuit breakers using the RELT switch. Install two labels on the equipment? One with ARMS and one without? To avoid

Leer más "

Distancia máxima donde la etiqueta de arco eléctrico aún es legible

24 de octubre de 2016

This week’s question is very subjective and is based on all kinds of variables such as lighting, eye sight etc. For an average person under normal conditions: What is the MAXIMUM distance where the typical arc flash label details are still readable? Less than 4 ft. (1.2 M) Between 4 and 8 ft. (1.2 to 2.4 M) Between 8 and 12 ft. (2.4 to 3.7 M) Something greater than 12 ft. (3.7 M) It depends ANSWER QUESTION

Leer más "

¿Me pregunto cuál es la clasificación de resistencia de estos?

19 de octubre de 2016

I’ve known about these switches in this old house for at least 15 years but never took any pics. I was over there today and thought I would share to see if they are common in other parts of the country. Out east maybe? I’ve only seen these switches in this one house here in Indiana. The house was built in 1931. I assume these are original to the building but don’t know for sure. Yes, they are manufactured by

Leer más "

Recent Posts

Categories

Categorías