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Determining Electrical Needs for Modular Offices

Terms and Definitions

WATTS = POWER The amount of electrical energy required to convert volts into heat energy.
AMPERES = CURRENT The flow of electrical energy
VOLTS = PRESSURE Measurement of force required to move current through a circuit

 

Relationships

WATTS WATTS = AMPS x VOLTS
AMPS AMPS = WATTS / VOLTS
VOLTS VOLTS = WATTS / AMPS

 

Estimating Amp Draw for a Typical Office

Most important aspect of calculating amp draw for an office is to get information from the customer as to what equipment or machines are going to be in the office. Most normal office items (ie. Personal computers, monitors, printers, calculators, fax machines, etc…) do not draw enough amps to be concerned about. The office items that have large amperage requirements are the ones to find out about. These include main frame computers, vending machines, space heaters, HVAC systems, welding equipment, etc… We would also like to know if the office or an area in the office is going to have a concentration of machines (like a typing pool or copier room).

Based on architectural graphic standards guidelines, listed below are some general rules to figure power requirements:

Average electrical loads for typical spaces in watts per square foot
Room Type Watts/SqFt
general office 4
copier rooms 15
conference rooms 1
word processing 5
computer rooms 40

Note: these loads do not include HVAC or special equipment requirements.

Example

20′ x 40′ office with 2-wall mount A/C-heat units
800 sq. ft. X 4 = 3200 watts
3200/120v = 26.7 amps
2-HVAC units @ 20 amps each
Total amp draw for office: 66.7 amps


Additional Electrical Specs