10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
These 10 free EHC questions are organized by exam domain, so you can see how each part of the Electrified Hardware Consultant blueprint is tested. Reveal the answer and explanation under each question.
During a failed strike-release attempt, a technician measures 24.0 VDC at the supply and 18.0 VDC at the strike, with the load connected. One terminal connection accounts for a 5.9 V drop; the relay and all remaining conductors account for only 0.1 V. Where should corrective work begin?
Correct answer: C - Isolate power and remake the faulty terminal connection.
A 24 VDC supply has a maximum output of 3.0 A, with no additional short-duration capacity. It powers three latch-retraction devices and a controller. Each device draws 0.90 A for 0.40 second at startup, then 0.18 A; the controller continuously draws 0.45 A. The required sequence starts all three devices together. Assess the supply for that sequence.
Correct answer: B - 3.15 A at startup; the supply has insufficient capacity.
'Unlock the trim, then start the operator' is proposed for an entrance with a fixed strike and an electrified outside lever. The electrical function enables the lever but leaves the latch projected. The owner requires automatic entry without touching the lever and positive latching between uses. What capability is missing?
Correct answer: C - Compatible latch retraction or keeper release before the operator moves.
A visitor intercom has a dry contact rated 0.10 A at 30 VDC resistive. The controller's remote-release input senses 12 VDC at 5 mA; closing it records a visitor grant and starts a six-second strike release. The controller's existing output is rated for the strike's 24 VDC inductive load, including its 1.2 A startup. The owner requires both the grant record and the six-second release. Select the intercom connection that preserves this operation.
Correct answer: D - Wire the intercom contact across the controller's remote release input terminals.
The owner requires an encrypted, supervised link between each reader and its controller. Both installed endpoints support OSDP Secure Channel, but the readers were commissioned using Wiegand. Credential transactions work. The integrator proposes a dedicated VLAN on the controller's Ethernet connection. What would satisfy the reader-link requirement?
Correct answer: C - Commission OSDP with Secure Channel, compatible wiring, and encryption keys.
A nonrated Group B office door has a UL 294-listed magnetic-locking system. Door-mounted hardware with an obvious method of operation directly interrupts lock power with one hand and one motion. Locking-system power loss also unlocks the door; panic hardware is not required. A reviewer insists on fire-alarm release solely because the lock is electromagnetic. No other applicable requirement calls for that interface. Under the 2021 IBC door-hardware-release provision, which review comment is correct?
Correct answer: A - The door hardware release provision does not itself require that fire-alarm interface.
A reviewer rejects a biparting automatic sliding entrance because neither leaf alone provides a 32-inch passage. With both leaves open, the actual clear passage measures 40 inches in both powered operation and the power-off mode. Under the 2010 ADA Standards, how should this width objection be assessed?
Correct answer: A - Use the combined clear opening of all open leaves in both power states.
An I-2 hospital psychiatric treatment area qualifies for the 2021 IBC controlled-egress exception for patients requiring restraint or containment. NFPA 13 sprinklers protect the building throughout. The locking system is listed; the area has emergency lighting and approved emergency procedures. Its locks remain secured on alarm and power loss as permitted by that exception. Only the charge nurse has any means of operating them. What is still required?
Correct answer: A - Give all clinical staff keys, codes, or other means to operate the locks.
A nonrated storeroom door passes its electrical release tests, but its main latch can still be depressed directly when the door is closed and the strike keeper is locked. Inspection shows the auxiliary deadlatching trigger dropping into the keeper pocket beside the main latch instead of bearing on the strike face. Which revision restores the missing security function?
Correct answer: B - Revise strike geometry to keep the auxiliary trigger depressed.
A nonrated storeroom opening has a fail-secure strike and mechanical egress. The owner requires entry to stay secured, with the door closed and latched, if controller power fails. Its nonlatching SPDT relay then de-energizes, but a separate lock supply remains powered. Supply positive feeds relay COM; strike negative returns to supply negative. Contact ratings are adequate. Which strike-positive connection and coil sequence should the point-to-point drawing specify?
Correct answer: D - Connect to NO; de-energize the coil while secured and energize it for a grant.
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