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The P99x test blocks contain 14 cassettes or positions that may be customize depending upon need. For current contacts you may use the numeric 8 or 9. 8 means CT with shorting bar to the next cassette below. 9 means the last CT cassette in a CT group. See the examples below and the attached guide for part numbers, and how to build one.
[ Accessories ] Test Blocks MiCOM P991, P992 & P993 .pdf