Electrical Construction & Maintenance

Stumped by the Code? Code Requirement for Sizing the Overcurrent Protection of Conductors

All questions and answers are based on the 2017 NEC. Q. What is the Code requirement for sizing the overcurrent protection of conductors? A. Except as permitted by Sec. 240.4(A) through (G), ...
Electrical Construction & Maintenance

Stumped by the Code? Rules for sizing transformer secondary conductors?

Q. What are the NEC rules for sizing transformer secondary conductors? A. A set of conductors supplying single or separate loads is permitted to be connected to a transformer secondary without ...
Electricity Forum

A Transformer Protection Relay Demands More Than Overcurrent Logic

A transformer protection relay does not replace upstream devices. It defines responsibility. By clearly assigning fault ...
Electronic Specifier

Making the right overcurrent protection design choices

Understanding the advantages, limitations, and use cases of each technology helps engineers create reliable consumer products.
EDN

ProTek Devices Intros Overcurrent Protection PPTC Thermistors

The new components include the PMPS150-1812; PMPS150E-1206; PMPS200-1812; PMPS200D-1210; PMPS260C-1812; and PMPS380E-1206. These surface mount device (SMD) PPTCs are designed for overcurrent ...
Electronic Design

Resettable Overcurrent Protection Device For Li-Ion Batteries Offers Size and Cost Benefits

TYCO ELECTRONICS announced the introduction of a Metal Hybrid PPTC (MHP) technology useful for high-rate-discharge battery applications at ratings above 30VDC/30A such as cordless power tools, e-bikes ...
Electronic Design

Protecting MOSFETs Against Overcurrent Events

For the PDF version of this article, click here. Protecting power transistors against overcurrent failure has always been a challenging issue in power circuit design. In order to protect against even ...