Hotel Load Calculations

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Npstewart

Senior Member
Good morning!

Im working on a 4-story hotel project. The suites in this hotel HAVE a permanent range and therefore meet the definition of a dwelling unit. My question the load calculations for the panels.

Im required to circuit the building similar to a prototype that I was given which basically has two panels per floor, and then all the branch circuits get routed back to just a couple of panels and therefore the little dwelling units do not have individual panels. These same panels would also feed the common area lighting.

My main question is; Am I permitted to use the Dwelling Unit Optional calculation and all of the associated reductions?

(ie. 2VA / sq ft for lights & recepts, 10 kW @ 100% + remainder @ 40% + HVAC) + Common area lighting @ 100%. THEN Im assuming I would use the demand factor listed in 220.84 for this connected load?

(or)

Should I use 2VA / Sq.ft + All Loads @ 100% + kitchen equipment @ 65%? I would probably prefer to do it this way but this would likely result in an over-sized service.

Thanks in advance.
 
Smart $

Smart $

Esteemed Member
Location
Ohio
With the suite wired to one of two 'floor' panels supplying two or more guest rooms or suites and common area loads, I believe you cannot consider an individual suite a dwelling unit. Don't forget that to use the optional dwelling unit calculation the unit must be supplied by a feeder with an ampacity of 100A or greater.
 
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Npstewart

Senior Member
Smart $ said:
With the suite wired to one of two 'floor' panels supplying two or more guest rooms or suites and common area loads, I believe you cannot consider an individual suite a dwelling unit. Don't forget that to use the optional dwelling unit calculation the unit must be supplied by a feeder with an ampacity of 100A or greater.
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Agree and great point. I will proceed with the 2nd option, taking diversity only on the kitchen equipment.
 
Smart $

Smart $

Esteemed Member
Location
Ohio
david luchini said:
You could use the 220.84 demand factors and then add the house loads to that.
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Actually, he explicitly mentioned 220.84 and I missed it. I automatically thought 220.82 when he mentioned a suite qualifying as a dwelling unit and taking the optional method route.

That said, he did not mention how many units were supplied by each panel. It has to be at least three to qualify for 220.84.

I wonder if the AHJ would let such calculation slide given these are hotel suites and zoned as commercial property. :blink:
 
david luchini

david luchini

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Staff member
Location
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Occupation
Engineer
Smart $ said:
Actually, he explicitly mentioned 220.84 and I missed it. I automatically thought 220.82 when he mentioned a suite qualifying as a dwelling unit and taking the optional method route.
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It looks as if the OP was trying to apply 220.82 (1st 10kVA @ 100%, remainder @ 40%) and THEN apply 220.84 on top of that, which cannot be done.

Of course, 220.82 would apply to a feeder for a single dwelling unit, so it wouldn't apply in this case where a feeder is supplying multiple dwelling units.

Also, the 2VA/sf in his "dwelling unit" calculation should be 3VA/sf. The 2VA/sf would be OK for his second calculation as a "hotel". In addition to the 65% non-dwelling kitchen demand, the non-dwelling receptacle demand factor would apply for the "hotel" calculation.
 
Smart $

Smart $

Esteemed Member
Location
Ohio
david luchini said:
The non-dwelling receptacle demand factor is 100% of the first 10kVA, and 50% of the remainder.
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This is using the standard calculation method, not 220.84.

An alternative to Table 220.44 is to use Table 220.42 per 220.44. So 50% for the first 20kVA, 40% from there to 100kVA... including lighting... but amounts to less demand than Table 220.44.
 
Sahib

Sahib

Senior Member
Location
India
Smart $ said:
An alternative to Table 220.44 is to use Table 220.42 per 220.44.
Click to expand...

That is better than applying demand factors from 220.44 to receptacle loads alone because it may reduce the total demand, provided the occupancy is listed in table 220.42.
 
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Smart $

Smart $

Esteemed Member
Location
Ohio
Sahib said:
That is better than applying demand factors from 220.44 to receptacle loads alone because it may reduce the total demand, provided the occupancy is listed in table 220.42.
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Hotels and motels...

Not saying one should take this route, but if the calculation is just a smidge over on minimum req'd rating...
 
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