Commercial Load Estimating
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Commercial Load Estimating. Richard Gaido, P.E. Types of Loads. Big Box Stores Grocery Stores Restaurants Schools Office Buildings Residential High Rises Hotels Data Centers Large Industrial Hospitals/Clinics Assisted Living/ Nursing Homes. Methodology of Diversification.

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Commercial Load Estimating

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Commercial load estimating

Commercial Load Estimating

Richard Gaido, P.E.


Types of loads

Types of Loads

Big Box Stores

Grocery Stores

Restaurants

Schools

Office Buildings

Residential High Rises

Hotels

Data Centers

Large Industrial

Hospitals/Clinics

Assisted Living/ Nursing Homes


Methodology of diversification

Methodology of Diversification

Historic Load

Square Footage

NEC Load Analysis


Historic load

Historic Load

Know Your Customer

  • Check historical loads of similar projects.

  • Compare like for like projects.

  • Newer Wal-Marts/Targets, within the last 8-10 years, have a grocery component (refrigeration).

  • Verify if the footprint of the buildings are similar.

  • Inquire if there is something special about this project’s service that maybe different from a “normal” load usually seen.

    • Office Building - Data Center or Call Center proposed?

    • Grocery Store – Is there an increased amount of refrigeration planned?

    • Manufacturing – Is the process automated?


Historic load1

Historic Load

Know Your Customer continued

  • Ask the customer for an address for a similar service built and operational within the last 12-18 months to have a comparison.

  • Characteristics of loads to consider when sizing your services can be dependent on a couple of deciding factors for instance:

    • Schools- High demand for 8 hours out of the day then drop significantly, allowing the transformers time to cool.

    • Hospitals- Consistently high demand throughout the day, thus leaving little time for the transformers to cool.

    • Industrial – Are they running normal 8 hour days or 24/7?

    • Industrial Testing Facilities – What is the largest load that they will be testing? How long? How often?


Square footage

Square Footage

  • Big Box Stores

    sample size of 103,000SF-133,000SF

  • Average SF: 115,758SF

  • Average kVA: 677kVA

  • Average VA/SF: 4.9 VA/SF

  • Hotels

    sample size of 13,00,000SF-46,000SF

  • Average SF: 26,469SF

  • Average kVA: 263kVA

  • Average VA/SF: 5.7 VA/SF

  • Schools

    sample size of 165,000SF-280,000SF

  • Average SF: 248,817SF

  • Average kVA: 2145kVA

  • Average VA/SF: 6.4 VA/SF

  • Data Centers

    sample size of 21,000SF-47,000SF

  • Average SF: 54,942SF

  • Average kVA: 1446kVA

  • Average VA/SF: 22.3 VA/SF


Nec load analysis

NEC Load Analysis

  • Grocery Stores

    Diversification Percentages

  • Air Conditioning 60%-70%

  • Refrigeration 75%-80%

  • Lighting 45%-65%

  • Receptacles 40%-60%

  • Water Heaters 20%-40%

  • Hand Dryers 5%-10%

  • Miscellaneous Motors 10%-30%

  • Restaurants

    Diversification Percentages

  • Air Conditioning 60%-70%

  • Refrigeration 40%-60%

  • Lighting 40%- 50%

  • Receptacles 20%-50%

  • Water Heaters 30%-50%

  • Hand Dryers 5%-10%

  • Residential/Office High Rises

    Diversification Percentages

  • Air Conditioning 60%-70%

  • Lighting 40%-70%

  • Receptacles 30%-80%

  • Water Heaters 20%-35%

  • Elevators 5%-10%

  • Garage Lighting/Elevators 10%-30%

  • Assisted Living Facilities

    Diversification Percentages

  • Air Conditioning 60%-70%

  • Lighting 30%-50%

  • Receptacles 20%-50%

  • Water Heaters 20%-30%

  • Elevators 5%-10%

  • Percentages used by line item on NEC Load Analysis provided by customer.


Commercial load estimating

Q&A


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