When performing a 400 hour electrical inspection on the BPU switchgear, what is the required resistance for ground connections?

In electrical systems, proper grounding is critical for safety and performance. During inspections, especially in crucial components like switchgear, maintaining appropriate ground resistance is essential to ensure effective fault current paths and mitigate electrical hazards. A ground resistance of less than 25 ohms is often specified as a standard requirement for electrical equipment to ensure safety and reliability.

When the resistance is kept below this threshold, it minimizes the risk of electric shock and prevents potential damage to equipment in the event of a fault. This level of resistance ensures that enough fault current can flow to trip protective devices effectively, thereby safeguarding personnel and infrastructure.

While other thresholds exist for various applications, the specification of less than 25 ohms is commonly accepted in many electrical safety standards, making it a suitable choice for this question regarding the inspection of BPU switchgear after 400 operating hours. This reflects a balance between safety, equipment protection, and the practical limitations of grounding systems that may be found in typical electrical installations.