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# Electrical Design Calculations Needed For Projects (Examples Included)

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## Design calculations

Design calculations establish minimum guidelines and requirements for generating electrical calculations on projects. Electrical calculations should be made for all projects that include electrical components and should be filed in the project notebook.

Design calculations may be made either manually or by computer programs. At a minimum, the following types of calculations should be made where applicable:

2. Conductor sizing
3. Conduit sizing
4. Motor branch circuit sizing
5. Power factor improvement
6. Transformer primary and secondary circuit sizing
7. Voltage drop
8. Motor starting voltage dip
9. Short circuit analysis
10. Lighting levels
11. Grounding in substations (where step potentials are of concern)
12. Harmonic distortion analysis
13. Cable pulling calculations
14. Generator capability/motor starting.

Load calculations should be made using applicable sections of NEC Articles 220, 430, and otherĀ sections of the NEC.

The following load calculations should generally be used for sizing:

1. Feeder conductors and protective devices
2. Transformers
3. Panelboard and switchboard main busses
4. Motor control center components
5. Service entrance devices and conductors
Load calculations must include all loads. They should be made by summing all of the loads (usingĀ appropriate diversity factors allowed by NEC Article 220) that are connected to eachĀ panelboard, switchboard, and motor control center.

An allowance must be made for future loadĀ growth. The loads for each branch of the distribution system can then be summed back to theĀ service entrance equipment.

#### Generator Sizing

The following information is intended to familiarize the design engineer with terms used byĀ generator sizing software and underlying formulas.

Generator single or multi-sets must be sized to supply maximum starting (SkVA), stead-stateĀ running (RkVA) and non-linear (GkW) demands of connected and future electrical equipment.

Information critical to the sizing and selection of generator single or multi-sets include:

1. Environmental conditions: elevation, temperature, indoor or outdoor
2. Noise abatement requirements: mufflers, enclosure, silent models
3. Fuel: diesel, gasoline, natural gas
4. Fuel storage: skid mounted tank, day and remote tanks
5. Cooling: liquid cooled radiator, forced air
6. Voltage regulation: maximum allowable voltage dips
7. Operation: prime, standby
8. Voltage ratings: voltage, 3-phase, 1-phase, solid grounded, delta, wye
9. Connected loads: Linear, non-linear, power factor

#### Sizing Procedures for Generator Single or Multi-sets

The following is the sizing procedure for generator single or multi-sets:

2. Enter individual load characteristics in software.
3. Enter loads in step sequence in software.
4. Have software calculate and select a generator set.

It is a good practice to request a verifying calculation from the preferred genset manufacturer.

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Mar 10, 2023

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Jan 27, 2023

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Jan 27, 2023

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Jan 26, 2023

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Jan 26, 2023

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Dec 11, 2022

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Dec 01, 2022

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Oct 27, 2022

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Oct 19, 2022

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Sep 28, 2022

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Sep 01, 2022

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Jul 11, 2022

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Mar 09, 2023

I’m interested in electrical design calculation on AC, and DC, and Solar system