517.33 Critical Branch

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kenaslan

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Billings MT
Only one jurisdiction has required an emergency generator for all the Dialysis clinics I have designed. However I think that 517.33(A)(8)e calls out the requirement for receptacles in a dialysis room to be on a "Critical Branch". As defined by 517.2 a Critical branch is connected to alternate power source. The owner of these nation wide facilities has directed me to only engineer a power generator when told to by the AHJ.

So the question is, Is an emergengy generator required or not. Like I said, after over 100 installations only one has required the installation of an emergengy power generator.

Ken
god I love this forum
 
Ken, IMO a Generator is required, coagulation starts pretty quick if the Dialysis Machine stops working.

Roger
 
we are working for a nationwide company who is in the process of installing standby generators in some of their dialysis clinics. According to these folks, the 90 seconds it takes for the standby to kick in is more than adequate ( I am not familiar with the dialysis machines or how the outage affects their operation).
 
nakulak said:
we are working for a nationwide company who is in the process of installing standby generators in some of their dialysis clinics. According to these folks, the 90 seconds it takes for the standby to kick in is more than adequate ( I am not familiar with the dialysis machines or how the outage affects their operation).
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The requirement is 10 seconds for Health Care Facilities.

517.31 Emergency System
Those functions of patient care depending on lighting or appliances that are connected to the emergency system shall be divided into two mandatory branches: the life safety branch and the critical branch, described in 517.32 and 517.33.
The branches of the emergency system shall be installed and connected to the alternate power source so that all functions specified herein for the emergency system shall be automatically restored to operation within 10 seconds after interruption of the normal source. [NFPA 99:4.4.2.2.2.1, 4.4.3.1]
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Roger
 
nakulak said:
we are working for a nationwide company who is in the process of installing standby generators in some of their dialysis clinics. According to these folks, the 90 seconds it takes for the standby to kick in is more than adequate ( I am not familiar with the dialysis machines or how the outage affects their operation).
Click to expand...


You should ask them how would they feel if they had a close family member on those machines and the power went out.
How long would they want them to wait??
 
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