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Archive: Category «Energy and Power»

Electrical Thumb Rules You MUST Follow (1)

Cable Capacity Current Capacity of Equipment Earthing Resistance Minimum Bending Radius Insulation Resistance Lighting Arrestor Transformer Diesel Generator Current Transformer Quick Electrical Calculation For Cu Wire Current Capacity (Up to 30 Sq.mm) = 6X Size… Read more

Aug 23, 2013 | jiguparmar

Electrical Thumb Rules You MUST Follow (Part 1)

Drive Design in Electric Vehicles

Good Evening all, in this session I’m going to present some of the issues in drive design in the field of Electric Vehicle. I’ve organized the whole series into modules so that each module can… Read more

Aug 21, 2013 | Vishy

Drive Design in Electric Vehicles

National Fire Alarm Code Defined By NFPA 72

NFPA 72 is the National Fire Alarm Code. The importance of installing smoke and fire alarms in homes is supported by results from exhaustive investigations of home fires indicating that measurable quantities of smoke come… Read more

Aug 16, 2013 | Edvard

National Fire Alarm Code Defined By NFPA 72

Selection Of Crane Duty Motors (Part 3)

Continued from second part: Selection Of Crane Duty Motors (Part 2) N = Duration of motor operation under rated conditions R = Duration of motor at rest and de-energised ØMax = Maximum temperature attained during… Read more

Jul 27, 2013 | Ashok Parikh

Selection Of Crane Duty Motors

Equipotential Bonding For Metal Installations

The electrical low voltage consumer’s installation requiring certain earthing resistances (disconnection conditions of the protective elements) and the foundation earth electrode providing good earthing resistances at cost-effective installation, the foundation earth electrode is an optimal… Read more

Jul 26, 2013 | Edvard

Equipotential Bonding For Metal Installations

Selection Of Crane Duty Motors (Part 2)

Continued from first part: Selection Of Crane Duty Motors (Part 1) Following two types of motors are widely used for crane duty applications. Squirrel Cage Crane Duty Motors Slip ring and Wound Rotor Crane Duty… Read more

Jul 24, 2013 | Ashok Parikh

Selection Of Crane Duty Motors (Part 2)

Selection Of Crane Duty Motors (Part 1)

The operating conditions such as duty cycle, startup, temperature and operating environment are vital considerations in the motor efficiency and reliability. It is absolutely essential to match the motors to their specified operating conditions for… Read more

Jul 22, 2013 | Ashok Parikh

Selection Of Crane Duty Motors

NEC Branch Circuit Requirements

The National Electrical Code (NEC 2011) provides guidance for electrical contractors and electricians, but it is really intended for use by governmental agencies that have legal jurisdiction over electrical installations and authorized electrical and insurance… Read more

Jul 15, 2013 | Edvard

NEC Branch Circuit Requirements

A Few Words About Battery Hazards and Why They Happen

Because batteries store large amounts of energy, there are certain hazards that are associated with battery operation. These hazards must be fully understood to ensure safe operation of batteries. Cell short circuits can be caused… Read more

Jul 03, 2013 | Edvard

A Few Words About Battery Hazards and Why They Happen

Surge protective categories defined by ANSI/IEEE C62.41

Three different surge protective classes or zones have been defined by ANSI/IEEE C62.41, Recommended Practice on Surge Voltages in Low Voltage Power Circuits. These classes are illustrated in the pictorial diagram Fig. 12-1. Category C (outdoors)… Read more

Jun 28, 2013 | Edvard

Surge protective categories defined by ANSI/IEEE C62.41


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