Indepth Electrical engineering

National Electrical Code (NFPA 70) – Working Spaces for 600 V Electrical Equipment In electrical installations, providing adequate working space around electrical equipment is not just good engineering practice—it is a mandatory safety requirement under the National Electrical Code (NEC/NFPA 70) . These provisions are designed to ensure safe operation, inspection, and maintenance of equipment rated at 600 Volts, nominal, or less . This article explains the key working space requirements , exceptions, and clearances mandated by NEC for low-voltage electrical systems. 1. General Requirement for Working Space Sufficient access and working space must be provided for safe operation, inspection, and maintenance . Spaces must comply with NEC specifications regarding depth, width, and height . No storage or obstruction is allowed in the designated working space. 2. Working Space Depth Requirements (a) Minimum Depth The minimum clear working distance depends on system volt...

NFPA 70 (NEC) – Examination, Identification, Installation, and Use of Electrical Equipment The National Electrical Code (NEC), NFPA 70 , establishes mandatory rules to ensure the safe installation and use of electrical equipment. Below is a simplified breakdown of key requirements: 1. Examination of Electrical Equipment Before approving equipment for installation, the following must be checked: Suitability for purpose/environment/application (labeling, instructions, or listing). Mechanical strength and durability of enclosures. Adequate space for wire bending and connections. Electrical insulation integrity. Heating and arcing effects under normal and abnormal conditions. Classification by type, voltage, and current rating. Other safety factors relevant to user protection. 2. Installation and Use Equipment must be installed as per listing or labeling instructions . Voltage rating of equipment ≥ circuit’s nominal voltage. Conductor materia...

Savings by using LED’s You have often seen articles and lot of advertisements to use LED lights instead of conventional lights. Seeming the higher cost of LED’s we often reluctant to purchase LED lights. But there are huge savings by means of using LED lights. Just by replacing LED tube light with conventional tube light savings are huge. Just go through the calculations as below:- Conventional Tube Light 36 W tube rod lumens intensity = 2000- 2500 Lumens Conventional Tube light Wattage = 36 W for Tube rod Choke Wattage of Tube light= 36 W So Total power consumption = 72 Wattage per hour Now considering 10 Hrs of use per day then total power consumption per day will be= 72 X 10=720 Watt hour Power consumption per month= 720 X 30 = 21600 = 21.60 KWH (Units) Now for whole year power consumption= 21.60 X 12= 262.80 KWH (Units) Power cost for per unit power consumption = 8 Rs (Avg. after considering all charges including tax and fixed char...