New York State Master Electrician Practice Exam

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In which scenario can a Type 3 SPD connection not be used?

At the service entrance
Near unsecured loads
Without proper grounding
With improper installation instructions

The correct answer is: With improper installation instructions

A Type 3 Surge Protective Device (SPD) is designed for installation at the point of use, typically where sensitive electronic equipment is located. It can effectively protect against transients, but it is critical that it is installed correctly to ensure optimal performance and safety. The scenario involving improper installation instructions is significant because following the manufacturer's guidelines is essential for the SPD to function as intended. If installation instructions are not adhered to, the SPD may not provide adequate protection, potentially leaving equipment vulnerable. This can include incorrect wiring configurations, inappropriate mounting, or failing to integrate with existing systems appropriately. In contrast, using a Type 3 SPD at the service entrance, near unsecured loads, or even in situations where there's grounding, can be acceptable as long as all specified installation instructions are followed correctly. Hence, an installation that does not adhere to instructions fundamentally undermines the purpose of the SPD, making it critical to prioritize proper guidance.