Electrical Construction & Maintenance

Code Q&A: Location of Overcurrent Protection Devices

A. Except as permitted by Sec. 240.21(A) through (H), overcurrent devices must be placed at the point where the branch-circuit or feeder conductors receive their power. Taps and transformer secondary ...
EDN

PPTC devices help protect electric motors, transformers and industrial controllers

Protecting an electronic circuit from damage due to excessive current or heat is the primary function of many circuit protection technologies. In the past, this protection took the form of a fuse or ...
Electrical Construction & Maintenance

NEC Guidelines for Transformer and Transformer Feeder Protection

Note: All Code references are based on the 2014 NEC. The NEC has separate sections for transformer feeder protection and transformer protection. Article 240 lists requirements for transformer feeder ...
EDN

Resettable circuit protection devices protect electric motors and transformers

Raychem Circuit Protection, a business unit of Tyco Electronics, has announced the introduction of its PolySwitch(tm) LVR series of resettable circuit protection devices. PolySwitch LVR devices help ...