Business locks
Fail secure: ask which side and which component the term describes
It describes the relevant locking behavior when electrical power is removed, but the controlled side and complete door assembly still matter. Do not infer inside exit behavior from the phrase alone. Ask the installer to identify the exact product function, power arrangement and approved operation. Building requirements must be evaluated for the actual opening.
Define the power condition precisely
Fail secure describes the relevant hardware's locking response when its electrical power is removed. It is not a complete description of every way a doorway behaves during a fault. The selected component, controlled side and overall assembly matter. Ask the installer to explain the named product's normal powered state and unpowered state rather than deciding that the phrase alone answers every business access or exit question.
Keep outside control separate from inside operation
An electrified lock can control entry from one side while its inside operation follows a different mechanical arrangement. Allegion's official terminology distinguishes the electrical function; the actual product documentation supplies the detailed behavior. Do not infer that a fail-secure label necessarily traps people inside or that it guarantees every opening remains appropriately secured under all failures. Both conclusions reach beyond the term's limited meaning.
Review the full opening specification
The lock works with a door, frame, other hardware and possibly access-control equipment. A qualified review should identify the intended assembly and relevant building requirements. Give the provider the opening identifier, installed product information and desired business routine. This guide does not select an appropriate life-safety design for a particular building; it explains the questions an owner should have answered by the responsible professionals.
Ask how power is actually supplied
The behavior of one component should be understood within the installed power and control arrangement. Ask which party supplies and maintains those parts and how normal operation will be demonstrated. Do not disconnect equipment casually to create an improvised test. Any planned acceptance test should follow the approved system design and manufacturer instructions, with the responsible parties coordinating the process.
Keep the explanation with the opening record
Record the exact product, function and approved operating description after installation. Staff who use the door should understand normal entry and exit without needing to interpret electrical shorthand. If a later replacement is proposed, review whether it preserves the intended behavior. A useful specification connects the term fail secure to a particular installed arrangement instead of leaving it as an unexplained phrase on a purchase order.
Before you call
- Identify the exact controlled component and side.
- Review inside operation separately from the electrical function label.
- Keep the approved power-loss behavior in the opening record.
Follow-up questions
Does fail secure alone describe the inside lever's behavior?
No. Review the complete product function and assembly. The electrical locking term does not replace the separate description of inside operation.
Should I disconnect power myself to check whether the installer chose correctly?
Use the approved acceptance and maintenance process with the responsible qualified parties. An improvised power test can omit important system conditions and does not establish overall suitability.
Official reference
Allegion: fail-secure terminology ↗
Electrical-function terminology. Review the exact product, controlled side and approved complete assembly.
Published by AID Locksmith, owned by Allan, serving Greater Sacramento. General service checklists are editorial guidance; product instructions apply to the named model.