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#Calculate the service demand locad how to
#Calculate the service demand locad generator
#Calculate the service demand locad full
#Calculate the service demand locad code

In addition to estimating your total power needs, it is critical to determine the starting load and running load for each item.ĭetermining Your Starting and Running Wattage Other commercial application: 50 kW + 5 watts per square foot Retail application: 50 kW + 10 watts per square foot The square footage sizing method is commonly used for retail locations such as grocery stores, restaurants and convenience stores.

#Calculate the service demand locad generator

Add 25 percent for reserve/surge capacity and size the generator accordingly.

Calculate total watts used by the largest motor and all remaining motor and non-motor loads and multiply by 1000 for kilowatts.

For all other motor and non-motor loads, multiply the current by the voltage for watts.

Multiply the starting current for the largest motor that turns on and off by the voltage for the number of watts required.

Find the highest peak demand over the previous year and then add 25 percent for reserve capacity.įull Load Capacity with Extensive Motor Use.

Review your utility bill for the peak demand each month.

Utilize your utility company's billing system to find your maximum power usage.

#Calculate the service demand locad full

Add the power in kilowatts used by each emergency safety system according to articles 700, 701, 702 and 708 of the NEC to the kilowatts required to obtain full load kilowatts (kW).įull load kW = Total amps x supply voltage / 1,000įor 100 percent power, generator size = Full load kW + reserve capacity.Multiply the result by the supply voltage, and again by 1,000 for kilowatts required. Divide the total amps by three for three-phase current, and by two for single-phase current.Use a clamp-on ammeter on each leg of the electrical service and add the measurements together to provide the total amps used by the facility.Depending on the type of business and your power needs, there are a variety of methods you can use to determine your full load capacity. Once you know which items you need to power with your generator, you will need to estimate your business’s power consumption at peak usage. Be aware that most commercial applications require a reserve or surge capability, especially for large motors operated by several units independently. Single- or three-phase power, voltage selection and total power output. Some factors for sizing a commercial generator include selecting For a healthcare facility or clinic, pay close attention to life-saving systems that require consistent power to operate, including breathing and dialysis machines.For a restaurant or food establishment, you should consider refrigeration, HVAC systems or any other appliances that require power to prevent food from spoiling.For an office building, you may need to power lighting, telecommunications, security and other basic systems that will allow people to evacuate the building safely.For a retail establishment, you may want to power some or all of your payment terminals, lights, security systems and mission-critical data servers.This varies widely depending on what type of business you operate, so don’t make the mistake of glossing over this step too quickly. Start with making a list of everything that you plan to power with your backup generator. Let’s look at what you need to know about estimating the right sized generator for your business. Critical facilities and security system failures.

#Calculate the service demand locad how to

Beyond regulatory compliance, not knowing how to properly size a generator can also lead to a host of other problems.

#Calculate the service demand locad code

This is why most large-scale commercial generator installations require an engineering plan and an engineer’s supervision to ensure compliance with National Electrical Code (NEC) and National Fire Protection Association (NFPA) requirements in the United States. Different buildings require different levels of backup power to keep these life-saving systems operational in the event of a blackout.

Need Help Determining How to Size a Generator?Ĭommercial backup generators provide power to a number of critical safety systems that operate during an emergency, including fire alarms, fire pumps, security systems, and emergency lighting.

Examining Generator Performance Charts for Load Requirements.

Determining Your Starting and Running Wattage.

Before you proceed with your commercial generator purchase, you’ll need to consider the needs of your business and the technical constraints of your building first. However, determining how to properly size a generator depends on a number of factors.

Standby generators also minimize business and data losses that arise from computer system failures. By providing backup or emergency power to your building during a power outage, commercial standby generators enable critical facilities like elevators and security systems to continue operating. A commercial generator plays a critical role in your business continuity plan.