Some type of transformer at the main entry (black round things with 200 writing on sides). What is the name of this and what do they do ? Thank s
Current transformers more info to follow .
Usually use for large amperage services .
The 200 is the ratio typically to 5 so those would be a 200 to 5 ratio CT. 200 amps through the CT will provide 5 amps of output to be measured by the metering equipment.
Thank You…Roy