New York City DOB Master Electrician Practice Exam 2025 – Your All-in-One Guide to Exam Success!

Question: 1 / 400

What is the purpose of the manufacturer’s instructions for Type 3 SPDs?

To determine installation locations

To specify distances for installation

The purpose of the manufacturer’s instructions for Type 3 Surge Protective Devices (SPDs) is to specify distances for installation. These instructions provide critical information on how far the SPD should be installed from the protected equipment, which is vital for ensuring effectiveness. Proper distance influences the SPD's performance, particularly in terms of response time and attenuation of surge events.

Following the manufacturer's guidance on installation distances helps to optimize the SPD’s performance and ensures that it can adequately protect against transient overvoltages from lightning strikes or other electrical disturbances. This aspect of installation is fundamental for maintaining the reliability and safety of the electrical system.

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To dictate fuse ratings

To ensure compatibility with appliances

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