You've outlined several valid approaches to calculating the electrical load for the hotel rooms. Let's break down each method, discuss their pros and cons, and then I'll offer my preferred approach and reasoning.

Understanding the Code (NEC) References 220.14(J): Dwelling Unit Receptacle Load

This section typically applies to residential dwellings. Applying it directly to hotel rooms is debatable, as hotel rooms, while used for lodging, aren't typically considered permanent dwellings.

220.14(K): Other Receptacles

This is your general "catch-all" for receptacles that don't fall under other specific categories.

220.42(A): General Lighting

This section provides the VA/square foot values for general lighting and receptacle loads in various occupancy types. You're using the 1.7 VA/sq ft for hotel/motel occupancies which is appropriate.

220.45: Table 220.45 - Demand Factors for Dwelling Units

This table allows for a demand factor to be applied to the calculated load for dwelling units. Its applicability to hotels is a key point of discussion.

440.62(A): Air Conditioning and Refrigeration Equipment

This section governs the load calculation for air conditioning and refrigeration equipment. You're correct in that it requires a 100% load calculation.

210.25 Guest Rooms or Guest Suites. This applies to guest rooms for the receptacle calculations in 210.52 210.52 (A) General Provisions Each guest room, in guest suites, shall have receptacles installed as specified in 210.52(A)(1) through (A)(4) 210.52 (A)(1) General. Receptacles shall be installed so that no point measured horizontally along the floor line of any wall space is more than 6 ft (1.83 m) from a receptacle outletAnalysis of Your Proposed ApproachesApproach 1: Simplest, Most Conservative Calculation

Area 1.7 VA/sq ft (220.42(A)) Add HVAC load at 100% (440.62(A)) Sum the above and size the feeder.

Pros

Simplest to calculate. Provides the highest safety margin due to no demand factor. Least likely to be challenged by an inspector.

Cons

Potentially oversized feeder, leading to higher initial costs for conductors, conduit, and overcurrent protection.

Approach 2: Applying Demand Factor Calculation

Area 1.7 VA/sq ft (220.42(A)) Multiply by hotel demand factor (Table 220.45 - if applicable) Add HVAC load at 100% (440.62(A)) Sum the above and size the feeder.

Pros

Potentially more accurate reflection of actual load. Lower feeder size, saving costs.

Cons

The applicability of 220.45 demand factors to hotel rooms is a debatable point. Some jurisdictions might not allow it. You need to justify the use of the demand factor to the AHJ.

Approach 3: Individual Appliance Loads Calculation

Area 1.7 VA/sq ft (220.42(A)) Multiply by hotel demand factor (Table 220.45 - if applicable) Add HVAC load at 100% (440.62(A)) Add coffee maker and minifridge at 100% Sum the above and size the feeder.

Pros

Attempts to account for specific appliance loads separately.

Cons

Most complex to calculate. Still relies on the debate about the demand factor. You're potentially double-counting if the 1.7 VA/sq ft already accounts for typical receptacle loads that would include these appliances. Overly conservative unless you can demonstrate that the receptacles are supplying significantly more load than anticipated in the general 1.7 VA/sq ft estimate.

My Recommended Approach

I would combine elements of the above approaches, but emphasize careful documentation and justification to the AHJ.1. General Lighting and Receptacle Load

Calculate the area of each room and multiply by 1.7 VA/sq ft (220.42(A)). Sum these for the entire 150 rooms.
2.

Demand Factor Justification

This is the crucial step.

Research local code interpretations regarding the application of demand factors (specifically Table 220.45 or similar) to hotel rooms. If permitted, carefully justify the use of the demand factor. Provide data (if available) on typical hotel room usage patterns in your area. Important

The AHJ (Authority Having Jurisdiction) has the final say. Discuss your intended approach with them early in the design process. If demand factors are not applicable the design approach will be more conservative.3.

HVAC Load

Calculate the total load (in VA or kVA) of all VRF fan coil units. Add this load at 100% (440.62(A)).
4.

Coffee Maker and Mini-Fridge



Evaluate if you need to add these separately. Generally, the 1.7 VA/sq ft should cover typical small appliance loads in hotel rooms. Only add them separately if these are unusually large or high-draw appliances and you're already applying a demand factor to the general receptacle load. If you're using the conservative Approach 1 (no demand factor), adding these separately is almost certainly overkill. To add separately determine the nameplate VA, or convert the amperage at the operating voltage.

Example Calculation (Illustrative)

Let's assume: Room Size: 400 sq ft Total Room Area (150 rooms): 60,000 sq ft HVAC Load (Total): 50 kVA Coffee Maker/Fridge (Each, if considered): 200 VA each, 30,000 VA Total for HotelConservative (Approach 1 - No Demand Factor)

Lighting/Receptacle: 60,000 sq ft 1.7 VA/sq ft = 102,000 VA HVAC: 50,000 VA Total: 152,000 VA

With Demand Factor (Assuming AHJ Allows - Example Use of Table 220.45 Illustrative)

Lighting/Receptacle: 60,000 sq ft 1.7 VA/sq ft = 102,000 VA Apply Demand Factor from Table 220.45. This table is for a dwelling unit. For illustrative purposes, if we select a demand factor applicable for 100+ dwelling units, we get 0.38 (38%) Adjusted Lighting/Receptacle: 102,000 VA 0.38 = 38,760 VA HVAC: 50,000 VA Total: 88,760 VA

With Demand Factor & Individual Appliances (If Warranted)

Lighting/Receptacle: 60,000 sq ft 1.7 VA/sq ft = 102,000 VA Apply Demand Factor from Table 220.45 - 0.38 - 38,760VA HVAC: 50,000 VA Appliances: 30,000 VA Total: 118,760 VA

Key Considerations & Best Practices Consult the AHJ Early

Discuss your approach with the local electrical inspector before finalizing your design. Their interpretation of the NEC is paramount.

Document Everything

Clearly document your load calculations, assumptions, and code references. This is essential for plan review and future reference.

Oversizing vs. Cost

Weigh the cost of a slightly oversized feeder against the potential risks of undersizing (nuisance tripping, future load growth).

Diversity Factors

Beyond the NEC demand factors, consider if any diversity factors are applicable based on the operational characteristics of the hotel. For example, do all rooms have 100% occupancy 100% of the time?

Future Load Growth

Design with some spare capacity for future load growth. Hotels often add amenities or upgrade appliances over time.*

Panel Schedules: Maintain accurate panel schedules to track actual loads and ensure proper circuit loading.By carefully considering these factors and working closely with the AHJ, you can develop a safe, efficient, and code-compliant electrical design for your hotel project. Flag for review