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Monthly Archive for: «December, 2011»

NEC Code for Size of Cable for Motor

Size of Cable for Branch circuit which has Single Motor connection is 125% of Motor Full Load Current Capacity. What is the minimum rating in amperes for Cables supplying 1 No of 5 hp, 415-volt,… 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 having… Read more

Dec 29, 2011 | Edvard

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

Transformer Protection – Abstract from NEC

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 input conductor.” Such overcurrent device shall be rated or set… Read more

Dec 26, 2011 | jiguparmar

Transformer protection - Aabstract from NEC (National Electric Code)

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. PROFIBUS… 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 minimal… Read more

Dec 23, 2011 | Edvard

Allen Bradley Motor Controller/Starter Bucket

When we started to use PLCs after all?

PLCs (Programmable Logic Controllers) were first introduced in the 1960’s. The primary reason for designing such a device was eliminating the large cost involved in replacing the complicated relay based machine control systems. Bedford Associates… Read more

Dec 21, 2011 | Edvard

When we started to use PLCs after all?


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