# Hot Tip #160 Diversity Factor

Text book definition: The probability that a particular piece of equipment will come on at the time of the facility's peak load. It is the ratio of the sum of the individual non-coincident maximum demands of various subdivisions of the system to the maximum demand of the complete system. The diversity factor is always greater than 1. The (unofficial) term *diversity*, as distinguished from *diversity factor* refers to the percent of time available that a machine, piece of equipment, or facility has its maximum or nominal load or demand (a 70% diversity means that the device in question operates at its nominal or maximum load level 70% of the time that it is connected and turned on).

Diversity factor is commonly used for a number of mathematics-related topics. One such instance is when completing a coordination study for a system. This diversity factor is used to estimate the load of a particular node in the system.

**Diversity Factor = **(Sum of Individual Max. Demand) divided by (Max. Demand on Power Station)

**Now, what it means to you:**

If your laundry has a 1,600 amp electrical service and has a Diversity Factor of **TWO,** than the sum of all “connected full load amperages” should not exceed 3,200 amps.

- Most CBW laundries have a Diversity Factor of around two.
- Washer extractor facilities have a factor of about four.

Another way to say the same thing is:

A diversity factor of two means, on average, that ½ of all your installed electrical machines are on line running in a full load condition.