How many independent entrapment protection means are required per entrapment zone for vehicular gate operators?

How many independent entrapment protection means are required per entrapment zone for vehicular gate operators?

• A. At least two
• B. One
• C. Three
• D. Four

Answer: (A)

Redundancy in entrapment protection is required for vehicular gate operators. For each entrapment zone, there must be two independent entrapment protection means so a single fault can’t leave the zone unprotected. Independent means the devices use different sensing methods or separate circuits, ensuring that a failure in one device doesn’t disable the other. For example, pairing a non-contact device like a photoelectric beam with a contact device such as a safety edge satisfies the requirement, since they rely on different principles and wiring. If there are multiple entrapment zones around a gate, each zone must have its own set of two independent means. This redundancy helps prevent entrapment injuries even when one device fails.

Redundancy in entrapment protection is required for vehicular gate operators. For each entrapment zone, there must be two independent entrapment protection means so a single fault can’t leave the zone unprotected. Independent means the devices use different sensing methods or separate circuits, ensuring that a failure in one device doesn’t disable the other. For example, pairing a non-contact device like a photoelectric beam with a contact device such as a safety edge satisfies the requirement, since they rely on different principles and wiring. If there are multiple entrapment zones around a gate, each zone must have its own set of two independent means. This redundancy helps prevent entrapment injuries even when one device fails.