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Health Care

lesson 3: Distribution

QuestionAnswer
Every health care standard requires health care facilities to have ? premise power distribution systems. 2 a "normal system" for non-essential loads and an "essential system" for loads crucial to life safety
true/false Normal system feeders must not serve critical patient care loads. false the essential electrical system provides power for critical services to both patients and staff
Why is it important to maintain as much physical separation as possible between the normal feeders and the essential feeders? to ensure a single event cannot disrupt service to both feeders
Each branch of the essential electrical system must be served by ? that will transfer the load from the normal feeder to the essential feeder when power is lost to the normal feeder. a dedicated transfer switch
The transfer switch serving the branches of the essential electrical system must send ? to the standby generators. a start signal
Essential electrical systems for nursing homes and other limited care facilities are classified as ? . Type 2
How many branches does a Type 2 essential electrical system have? 2
Which branch is not found as part of a Type 2 essential electrical system? The critical branch
Type 1 essential electrical systems in hospitals are divided into three branches. Which is not a branch of the essential electrical system. The emergency standby branch
? feeds lighting, receptacles, and other equipment that is essential for alarms, egress, and evacuation in case of a normal power outage. The life safety branch means of egress illumination, exit signs, fire alarm systems, elevator cab, automatic doors used for egress, task lighting, generator accessories
The transfer switch serving the life safety branch must assume the load within ? of a normal power outage. 10 seconds
true/false The requirements of NEC Article 700 shall apply to the life safety branch of the essential electrical system unless amended by Article 517. true 517.26
? may be considered the branch that keeps patients and health care workers safe during the performance of everyday diagnostic, clinical, and treatment activities. The critical branch
The transfer switch serving the critical branch must assume the load within ? of a normal power outage. 10 seconds
? serves mechanical equipment that is important to the safety and health of patients and staff. The equipment branch
Loads connected to the equipment branch are designed to be connected ? . to the generators after the life safety and critical branches are transferred
Generally, the categories that transfer switches can be divided into are ? and ? . automatic / manual
In health care facilities, manual transfer switches are permitted on ? . only low priority equipment loads
? employ a system of contacts to transfer the load connections from one source to another. Contactor automatic transfer switches
Automatic transfer switches monitor the voltage and frequency of the current on the normal connection. In the event either factor falls below a predetermined level, the transfer switch ? . sends a start signal to the generator
NFPA 110 requires that essential electrical systems be tested ? . monthly
An automatic transfer switch with ? contacts will leave the load unattached to a source for a brief period of time during the transfer. open transition
true/false If an automatic transfer switch with bypass is used, the bypass must be able to manually transfer between normal and essential electrical system sources. true
Which system always provides conditioned power to the critical loads whether the load is fed from the normal system or from the essential system feeders? UPS systems
Which electrical distribution design is used in medium to large health care facilities that employ two normal services and two sets of service entrance conductors? Double-ended gear systems
Which electrical distribution design is intentionally back-fed? When using this system, opening one device does not deenergize the circuit. Loop systems
Which electrical distribution design is typically used when one generator is sufficient to carry the essential system load? Radial systems
Generally, which overcurrent protection device has the quickest reaction time when fault-current occurs? fuse
Which overcurrent protection device is resettable after a fault? Circuit breaker
? is the localization of an overcurrent condition to restrict outages to the circuit or equipment affected. selective coordination
Emergency system overcurrent devices shall be selectively coordinated with all load-side overcurrent protection devices. 700.32
? requires a second level ground-fault protection on feeders that are downstream of ground-fault protection required in Article 230. 517.17
Created by: Yusosweet1
 

 



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