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

Equipos existentes en exceso

1 de agosto de 2016

This week’s question is a continuation of last week’s topic regarding overcurrent devices that do not have an adequate interrupting rating. When the calculated short circuit current is greater than the device’s short circuit interrupting or withstand rating, the device is often referred to as “overdutied”. (X/R can play a role too but we’ll save that for another day) This week’s question: Do you/client presently have any overdutied devices? Yes No Not Sure Rather Not Say READ MORE

Leer más "

Selección de EPP al interactuar con equipos no etiquetados

1 de agosto de 2016

Hi All, To put my question in context, I train Industrial Maintenance and Construction Electricians at a Community College. Some of the students are new to the field and are receiving training to gain employment. Many of the students are already employed and are taking classes to enhance their skill set. Many of these folks are involved with service work that takes them to a variety of locations from 7-11s to industrial sites. Where I am troubled is how to

Leer más "

Modelado de detección de arcos eléctricos mediante fibra óptica

1 de agosto de 2016

I will start by stating that I am not 100% familiar with these types of systems [Fiber Optic Light Detecting]. In recent MV switchgear submittal the manufacturer [I assume at the recommendation of the engineer of record and or the owner] included a fiber optic light detection system for arc flash mitigation. This included “point source detection” at the terminations in addition to “linear fiber optic detection” in the breaker cubicles at the runbacks / breaker connections. In discussing with

Leer más "

Límite de arco eléctrico: ¿calculado, más grande, algo más?

29 de julio de 2016

It has been a while since a question of the week was asked about the Arc Flash Boundary. This is the distance from a prospective arc flash where the incident energy is 1.2 cal/cm^2 which is the generally accepted value for the onset of a second degree burn. IEEE 1584 has a method for calculating this distance. Since electrical safety practices continue to evolve, this week’s question is about the Arc Flash Boundary. Although the AFB is required to be

Leer más "

Energía incidente no específica

29 de julio de 2016

Empecé a trabajar en una planta de fabricación donde la práctica anterior era poner <1,2 cal en sus etiquetas de arco eléctrico. La idea era que cualquier tramo de menos de varios cientos de pies alimentado desde un conducto de bus con fusibles LPS-RK1 sería inferior a 1,2 cal. Esto resulta ser cierto según mis cálculos. Incluso con las contribuciones máximas del motor, los cálculos se mantienen. ¿Alguien considera que esto cumple con la norma 70E? ¿Alguien más hace esto?

Leer más "

Cálculos de cortocircuito y material de conductos

29 de julio de 2016

I recently came across a previous study that was completed for a facility that assumed a specific type of conduit [non-metallic/magnetic; PVC] vs what was actually installed [Rigid Meal Conduit], in digging into this deeper and looking at some of the short circuit calculations information available to me it appears that in the calculation they type of conduit [magnetic vs non-magnetic] can play a role in the amount of available fault current. When doing some quick simplistic calculations it appears

Leer más "

Recent Posts

Categories

Categorías