C7 Nurse Call, Intercom & Paging Systems

Question 1

Which UL standard governs the listing and testing requirements for hospital signaling and nurse call equipment?

Accepted Answer

UL 1069

Answer

UL 294

Answer

UL 681

Answer

UL 2572

Question 2

In a zone paging system serving a multi-story office building, the paging amplifier output must be matched to the speaker load. If the amplifier is rated at 70.7 volts and the total speaker tap wattage on a zone is 80 watts, what minimum amplifier wattage is required for that zone?

Accepted Answer

80 watts

Answer

40 watts

Answer

100 watts

Answer

160 watts

Question 3

A nurse call patient station in a hospital room should be wired so that a call can be canceled from which location?

Accepted Answer

At the patient station or at the duty station outside the room

Answer

Only at the patient station

Answer

Only at the master station at the nurses' desk

Answer

Only by a supervisor with a key switch

Question 4

When installing a two-wire intercom system in a residential building, what is the primary function of the door strike output on the master intercom station?

Accepted Answer

To release an electric door strike or magnetic lock to grant entry

Answer

To power the intercom handset at the door

Answer

To activate the building's fire alarm

Answer

To switch the intercom system to hands-free mode

Question 5

In a paging system using a 25-volt distribution line rather than a 70.7-volt line, what is the practical effect on the maximum cable run distance for a given speaker tap load?

Accepted Answer

The 25V system results in greater signal loss over distance and requires shorter runs or heavier wire

Answer

The 25V system allows longer runs with less signal loss

Answer

Voltage rating has no effect on cable run distance

Answer

The 25V system is only used outdoors and distance is irrelevant

Question 6

Which wiring method is most appropriate for a concealed nurse call installation inside a hospital patient room where cables run through a plenum ceiling space?

Accepted Answer

CMP (plenum-rated) cable per NEC Article 800

Answer

Standard CL2 rated cable (non-plenum)

Answer

Type NM cable in flexible conduit

Answer

Any cable since nurse call voltages are below 50V