Journeyman Electrician Practice Exam

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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.

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What types of sources of supply must be prevented from inadvertently interconnecting in optional standby systems?

Primary and secondary
Internal and external
Input and output
AC and DC

The correct answer is: Primary and secondary

In optional standby systems, it is crucial to prevent the inadvertent interconnection of primary and secondary sources of supply. The primary source typically refers to the normal utility supply, while the secondary source consists of backup systems like generators or batteries. If these sources were to interconnect inadvertently, it could create unsafe conditions, potentially leading to issues like overloads, equipment damage, or safety hazards for personnel who may be working on the system under the assumption that it is de-energized. Maintaining clear separations between primary and secondary sources ensures that the standby systems can operate independently when necessary, providing a reliable backup without risk of interference or failure from the main utility supply. This separation is also essential for compliance with electrical codes and standards designed to foster safety and reliability in electrical installations. In contrast to the other options, which do not directly address the primary and secondary supply relationship in standby systems, highlighting this aspect is crucial for proper system design and operation.