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How many optional modules does the Power Meter 800 Series (PM800) support?

Issue
How many optional modules does the Power Meter 800 Series (PM800) support?

Product Line
PM800 series meter

Cause
Customer would like to know the maximum number of modules PM800 series meter can support.

Environment
Installing maximum number of modules on PM800 series meter.

Resolution
In March of 2005 a redesigned power supply changed the limits of how many option modules were allowed and the de-rating levels for operating temperature.
The series 800 Power Meter supports up to two (2) option modules. There are couple different ways this can be done.

1) One I/O module (ex. PM8M2222) and PM8ECC
2) Two I/O modules (ex. PM8M2222) are mounted together with control power over 370 Vac and the operating temperature rating must be reduced to -25° to 50°C. The operating temperature rating is -25°C to 70°C when the control power is < 370 Vac.

NOTE: Keep in mind that the PM8ECC can be installed only on any Series 800 Power Meter that was manufactured after March 2005. 
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