Thursday, May 22, 2014

ABB MNS-MCC Low Voltage Motor Control Center Application Guide

Comparison of IEC & NEMA Schematic Diagrams

MOTOR CONTROLS / Electrical Symbols and Line Diagrams

TYPICAL WIRING DIAGRAMS For Push Button Control Stations

Eaton Basic wiring for motor control

Test Procedures of the Behaviour of Cables in Case of Fire

Fundamentales of Electric Circuits

Tuesday, March 11, 2014

Low Voltage Circuit Breakers

Based on IEC 60947-2 (LV switchgear and controlgear - Part 2: Circuit breakers):

 

In (Rated current)

 

The rated continuous / uninterrupted current that the circuit breaker can carry.

 

Icm (Rated short-circuit making current)

 

The short-circuit current that the circuit breaker can withstand as it is closing where the act of closing initiates the fault.

 

Icu (Rated ultimate short-circuit current)

 

The maximum symmetrical short-circuit current the circuit breaker can interrupt.

 

Ics (Rated service short-circuit current)

 

The breaking capacity such that the circuit breaker is tested to carry its current continuously. The test sequence verifies that the breaker can be returned to service. Ics is the maximum current the breaker can interrupt multiple times and be returned to service without being damaged and is expressed as a % of Icu.

 

Icw (Rated short time withstand current)

 

This is the steady state symmetrical fault current the breaker has to be able to carry for a duration of 0.05s to 3s without exceeding its thermal integrity.

Tuesday, March 4, 2014

Medium Voltage Design Guide (Schneider Electric)

 

DOWNLOAD :

http://www.schneider-electric.ie/documents/panelbuilders/en/shared/technical-ressources/mv_design_guide.pdf