No, a steam generator and a hot tub would not necessarily be figured at 100% for a load calculation. The specific rules depend on the type of load, the size of the load, and the applicable codes and standards (primarily the National Electrical Code, NEC). Here's a breakdown

Steam Generator:
Demand Factors

The NEC allows for demand factors to be applied to certain loads based on the likelihood of simultaneous use. Generally, you can't apply demand factors as easily to smaller loads.

Motor Loads

If the steam generator has a motor, you'll need to consider the starting current (locked rotor amps) which is higher than the running current. This is typically addressed using conductor sizing and overcurrent protection designed to handle the motor's starting characteristics.

NEC Article 682 and 680

Review applicable sections to your location.

Hot Tub (Hydromassage Bathtub)



NEC Article 680

This article covers all electrical requirements for swimming pools, spas, hot tubs, and hydromassage bathtubs. It is critical for hot tub installations.

Load Calculation Requirements



Heater Load

The heater is usually the largest load. You must use the nameplate rating of the heater for your load calculation.

Pump Motor(s)

Each pump motor needs to be calculated. The NEC requires you to use the motor's full-load current (FLA) rating from the nameplate. You may need to account for the largest motor at 125% of its FLA and the rest at 100% (refer to the NEC).

Other Loads

Any other loads associated with the hot tub (e.g., lights, ozone generators, other accessories) must be included at 100% of their rating.

Demand Factors

Demand factors are generally not applied to individual hot tub components. You calculate each component and then sum them up.

Receptacles and GFCI Protection

Pay close attention to the requirements for receptacles near the hot tub and the GFCI (Ground Fault Circuit Interrupter) protection required for the hot tub circuit and nearby receptacles.

Important Considerations and Why You Can't Assume 100%



Nameplate Data is Key

Always use the nameplate information on the steam generator and hot tub. This will provide the correct voltage, amperage, wattage, and other critical details for your calculations.

Local Codes and AHJ (Authority Having Jurisdiction)

Local electrical codes may be stricter than the NEC. Always consult with your local AHJ or a qualified electrical inspector to ensure compliance. They can provide definitive answers based on your specific location.

Safety

Electrical work around water is extremely dangerous. Always use a licensed electrician for the installation and wiring of steam generators and hot tubs.

In summary: You need to add up the individual load calculations of the steam generator and hot tub as described above. Usually, you would not apply demand factors to a single steam generator or hot tub. Demand factors are more commonly used for entire dwelling units or larger groups of loads. Consult the NEC (especially Articles 680 and 682) and your local codes. Use the nameplate ratings of all equipment.* Engage a qualified electrician for installation and to ensure compliance with all applicable regulations.This information is for general guidance only and should not be considered a substitute for professional advice. Always consult with a qualified electrician for your specific situation. Flag for review