Multiple pool water heater in large spa environment

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bthomaspe

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NEC 680.9 requires a 25% margin to be added to the branch circuits. However, for feeder service calculations, this facility has 15 disassociated heaters for the pools' water. Code 220 suggests that a demand factor of 40% can be used. Is this appropriate for this environment
 
bthomaspe said:
NEC 680.9 requires a 25% margin to be added to the branch circuits. However, for feeder service calculations, this facility has 15 disassociated heaters for the pools' water. Code 220 suggests that a demand factor of 40% can be used. Is this appropriate for this environment
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Could you please clarify "this Facility" ?

Thanks,
R
 
Clarification

Clarification

The facility is a water park.

The heating controls for the different pools and rides are not interconnected. Therefore all of the heaters can be on at the same time.

:roll: However, The controls can be linked together to limit the heaters to one section or another scheme to limit the number of heaters that are on.
 
Being a "Water ParK", I don't think it qualifies for any reduction as far as the heaters go. I would be considering them more of a continuous load on the feeder(s), consider the hours of operation. Unless the "assembly including OCPD is listed for 100%". See 215.2 & 215.3. What part of Article 220 are you looking at that suggests a demand of 40% ?

R
 
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