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UL 887 8th Edition, October 5, 1999
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UL Standard for Safety Delayed-Action Timelocks
Includes all amendments and changes through Revision Page(s) , April 9, 2013
Published By:UL (UL)
Page Count:14
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These requirements cover delayed-action timelocks intended for attachment on the doors of safes, chests, vaults, and the like, to provide a means for locking the door for a predetermined length of time as protection against burglary or robbery or both.

The timelocks covered by these requirements may be automatic, manual, or both, in operation depending upon their design. Automatic devices can be factory set to a fixed minimum time delay of 5 minutes. Manual devices are generally set by the user with a key or similar device to provide delays of 120 hours or more. Some designs may include both the automatic delay feature for interior robbery protection and the manual delay feature for burglary protection.

A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this standard, and that involves a risk of fire or of electric shock or injury to persons shall be evaluated using appropriate additional component and end-product requirements to maintain the level of safety as originally anticipated by the intent of this standard. A product whose features, characteristics, components, materials, or systems conflict with specific requirements or provisions of this standard does not comply with this standard. Revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this standard.