Journeyman Electrician Practice Exam

Disable ads (and more) with a membership for a one time $4.99 payment

Prepare for the Journeyman Electrician Exam. Test your skills with multiple-choice questions designed to help you succeed. Each question comes with hints and detailed explanations to assist in your study process.

Practice this question and more.

For emergency systems, storage batteries must maintain total load supply for at least how long without dropping below 87½ percent of normal voltage?

1 hour
1.5 hours
2 hours
2.5 hours

The correct answer is: 1.5 hours

Emergency systems are crucial for a variety of applications, especially in maintaining safety and operational integrity during power outages. The requirement that storage batteries must sustain total load supply for a specified duration while not dropping below a certain voltage (in this case, 87½ percent of normal voltage) reflects standards aimed at ensuring reliability and performance under critical conditions. In this context, the specification for storage batteries to provide at least 1.5 hours of backup power while adhering to the voltage criteria is rooted in common safety and operational protocols in emergency systems. This duration helps ensure that critical systems can function effectively long enough for backup generators to start or for safe evacuation procedures to be completed. It strikes a balance between providing sufficient backup time and ensuring the longevity and health of the battery systems under operational stress. Understanding the significance of this requirement can help ensure compliance with regulations surrounding safety and emergency preparedness in electrical installations.