Monthly Archive for: «December, 2011»

NEC Code for Size of Cable for Motor

NEC Code 430.22 (Size of Cable for Single Motor) Size of Cable for Branch circuit which has Single Motor connection is 125% of Motor Full Load Current Capacity. Example What is the minimum rating… Read more

Dec 30, 2011 | jiguparmar

Motor terminal box

The Cage Induction Motor Explained In Details

This simplest form of AC induction motor or asynchronous motor is the basic, universal workhorse of industry. Its general construction is shown in Fig. 1. It is usually designed for fixed-speed operation, larger ratings… Read more

Dec 29, 2011 | Edvard

Three phase squire cage induction motor, fully enclosed and fan-cooled

Ladder Diagrams And The PLC

PLC Ladder Diagram The ladder diagram has and continues to be the traditional way of representing electrical sequences of operations. These diagrams represent the interconnection of field devices in such a way that the… Read more

Dec 27, 2011 | Edvard

Ladder Diagrams And The PLC

Transformer Protection – Abstract from NEC

NEC, Code 450.4 Calculate overcurrent Protection on the Primary According to NEC 450.4, “each transformer 600 volts, nominal, or less shall be protected by an individual overcurrent device installed in series with each ungrounded… Read more

Dec 26, 2011 | jiguparmar

Transformer protection - Aabstract from NEC (National Electric Code)

What psychological effect does an electric shock?

AC’s alternating nature Most of us have experienced some form of electric ”shock”, where electricity causes our body to experience pain or trauma. If we are fortunate, the extent of that experience is limited… Read more

Dec 25, 2011 | Edvard

The electric shock sign in France

PROFIBUS at a Glance

PROFIBUS is an open, digital communication system with a wide range of applications, particularly in the fields of factory and process automation. PROFIBUS is suitable for both fast, time-critical applications and complex communication tasks…. Read more

Dec 24, 2011 | Edvard

PROFIBUS - Optical connection

Motor starting problem and high motor inrush currents

Electric motor protection device depends on the accurate and correct selection of overload(s), fuses and/or circuit breakers. Over the years the protective devices have been selected according to the applicable code requirements with only… Read more

Dec 23, 2011 | Edvard

Allen Bradley Motor Controller/Starter Bucket
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