Wiktor Wise
Electrical load schedule calculations are essential for determining the instantaneous electrical loads in a facility, categorised by switchboard or sub-facility/area. This process involves several steps, including listing expected electrical loads, collecting electrical parameters, classifying loads, and calculating consumed, operating, peak, and design loads. Electrical load capacity is crucial for safety, especially in the Philippines, where electrical connection issues are a significant cause of fires. Understanding your home's electrical load capacity helps manage electricity distribution and prevent overloading. To calculate electrical load capacity, create a list of electrical devices, locate their power ratings, and add up the wattage to determine total power demand. This value can then be compared to the electrical service capacity, typically found on the electrical panel, ensuring a safety margin to accommodate future changes.
| Characteristics | Values |
|---|---|
| Purpose | To estimate the instantaneous electrical loads operating in a facility. |
| Parameters | Rated power, absorbed power, power factor, efficiency, voltage level, and switchboard location. |
| Types of Loads | Process loads (directly relevant to the facility) and non-process loads. |
| Load Schedule Classification | Categorised by switchboard or occasionally by sub-facility/area. |
| Electrical Load Capacity | The maximum amount of electricity an electrical system can safely handle, measured in watts or watt-hours. |
| Power Measurement | Active power (kW), reactive power (kVAR), and apparent power (kVA). |
| Safety Considerations | Use of surge protectors, unplugging appliances, and leaving a safety margin of 20% when calculating total power demand. |
| Formula for Power | Power (W) = Voltage (V) x Current (A). |
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What You'll Learn
List all electrical devices and appliances
To compute the electrical load schedule for a facility, the first step is to list all the electrical devices and appliances that will be supplied by the power system. This list will include all the electrical loads, which can be categorised by switchboard or sub-facility/area.
Electrical devices and appliances can be further divided into two types of loads: process loads and non-process loads. Process loads are directly relevant to the facility, such as industrial machinery in a factory. Non-process loads are the electrical devices and appliances used in the day-to-day running of the facility, such as lighting, computers, and other office equipment.
- Refrigerators
- Washing machines
- Dishwashers
- Clothes dryers
- Kettles
- Coffee makers
- Blenders
- Toasters
- Ovens
- Stoves
- Sewing machines
- Computers
- Televisions
- Radios
- DVD players
- Cameras
- Alarm clocks
- Vacuum cleaners
- Electric drills
- Lighting (lamps, light bulbs)
- Water heaters
- Water purifiers
- Kitchen hoods
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Find the power rating of each device
To compute the electrical load schedule for a facility, you need to first identify the electrical loads and their parameters. This includes finding the power rating of each device. Power rating, also known as rated power, is the total electrical power required for the normal operation of an electric appliance. It is usually provided in the literature that comes with the appliance, but it can also be calculated.
The power rating of a device is measured in watts and is calculated by multiplying the current in amperes (A) by the voltage in volts (V). These values can usually be found in the user manual, on the transformer, or on the information sticker attached to the device.
For example, let's say you have a device that operates at 5 amps and 220 volts. To find the power rating, you would multiply the current by the voltage:
5 A x 220 V = 1100 W
So, the power rating of this device is 1100 watts.
It is important to note that the power rating represents the maximum continuous power output of the load, and most devices will not operate at their rated capacity all the time. Therefore, when calculating the electrical load schedule, you need to consider the expected absorbed power, which is the power that will be drawn by the load during normal operation. This value may be lower than the rated power, as devices are typically sized with a conservative design margin.
By collecting the power rating or expected absorbed power for each device, you can then calculate the total electrical load and design an appropriate power system for the facility.
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Calculate the total power demand
An electrical load schedule is an estimate of the instantaneous electrical loads operating in a facility, in terms of active, reactive and apparent power (measured in kW, kVAR and kVA respectively). The load schedule is usually categorised by switchboard or, occasionally, by sub-facility or area.
To calculate the total power demand, follow these steps:
- Create a list of all the electrical devices and appliances in your home. This includes lights, fans, air conditioners, heating appliances, refrigerators, washing machines, computers, televisions, microwaves, and any other electrical equipment used regularly.
- For each device, locate its power rating, usually measured in watts (W) or kilowatts (kW). This information can typically be found on the nameplate or in the user manual. If the rating is given in amps (A), it can be converted to watts using the formula: Power (W) = Voltage (V) x Current (A).
- Add up the power ratings of all the devices to determine the total power demand in watts.
- Check the rating or capacity of your electrical service, usually found on your electrical panel. This represents the maximum amount of power your home's electrical system can handle safely and is typically expressed in kilowatts (kW) or kilovolt-amperes (kVA).
- To ensure you don't overload your electrical system and to account for any future additions or changes, it is good practice to leave a safety margin of around 20%. Multiply your total power demand by 1.2 (or 120%) to include this margin.
- Finally, compare the total power demand (with the safety margin) to the electrical service capacity.
It is important to note that there are no standards governing load schedules, and the calculations are based on generally accepted industry practices.
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Check the rating of your electrical service
To compute an electrical load schedule, it is important to first determine the rating of your electrical service. This refers to the total amount of electrical power that your residence receives from the electrical company, which is measured in amps or amperes.
The electrical service provided to your home typically falls between 100 to 200 amps, depending on various factors. Older homes that have not been updated may have as little as 30 amps, while larger houses with extensive electrical appliances and heating systems can have up to 400 amps.
To visually assess your electrical service, you can look at the electrical meter outside your house. Observe the point where the main service wires from the utility company enter your home. If electrical service is delivered by overhead wires, they may enter through a metal service pipe running down an exterior wall to the meter. Alternatively, they may connect directly to a service entrance cable, usually grey, and feed into the meter base. If your meter has a glass dome mounted on a square metal base, your home likely has 100 amps of power.
You can also identify the main circuit box or main service panel, typically a grey metal box located along the inside surface of an outside wall, often in a utility area such as a garage, basement, or furnace area. Inside the main circuit box, you will find two warm bus bars and a 120-volt service cable affixed to each bar. When a residence circuit is linked to a single bus bar, it delivers 120 volts of power. If a circuit is connected to both bus bars, it will supply 240 volts.
Additionally, you can refer to the Philippine Electrical Code (PEC) for specific requirements and guidelines related to electrical service and load management. The PEC provides information on the ampacity or current-carrying capacity of electric conductors, as well as the need to protect conductors from overcurrent.
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Compare total power demand with the electrical service capacity
The electrical load schedule is an estimate of the instantaneous electrical loads operating in a facility, in terms of active, reactive and apparent power (measured in kW, kVAR and kVA respectively). It is a summary of data that helps identify and facilitate the necessary values and equipment ratings to be used in any electrical installation.
To compare the total power demand with the electrical service capacity, you need to calculate the total power demand and the electrical service capacity.
The total power demand is the sum of the power consumed by all the electrical loads in the facility. Each load will have an expected power consumption, which can be found on the appliance or through calculations involving its electrical parameters, such as nominal/absorbed ratings, power factor, and efficiency.
The electrical service capacity is the maximum amount of electricity that the electrical service can provide, measured in amperage (amps). This value can be found on the electrical panel or by multiplying the voltage of the electrical service by the amperage capacity.
Once you have calculated the total power demand and the electrical service capacity, you can compare them to ensure that the total power demand does not exceed the electrical service capacity. It is recommended that the load does not exceed 80% of the capacity to prevent circuit overload and the risk of electrical fires.
For example, a 20-amp, 120-volt branch circuit has a capacity of 2,400 watts (20 amps x 120 volts). With the 80 percent rule, it can support light fixtures and appliances up to 1,920 watts without the risk of overload.
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Frequently asked questions
An electrical load schedule is an estimate of the instantaneous electrical loads operating in a facility, in terms of active, reactive and apparent power.
The first step is to collect a list of the expected electrical loads in the facility.
The second step is to collect the electrical parameters for each load, such as nominal/absorbed ratings, power factor, and efficiency.
The third step is to classify each of the loads in terms of switchboard location, load duty, and load criticality.
The fourth step is to calculate the expected consumed load for each load.
