110.22 Identification of Disconnecting Means.
(A) General. Each disconnecting means shall be legibly marked to indicate its purpose unless located and arranged so the purpose is evident. In other than one- or two- family dwellings, the marking shall include the identification and location of the circuit source that supplies the disconnecting means unless located and arranged so the identification and location of the circuit source is evident. The marking shall be of sufficient durability to withstand the environment involved.
(B) Engineered Series Combination Systems. Equipment enclosures of circuit breakers or fuses applied in compliance with series combination ratings selected under engineering supervision in accordance with 240.86(A) shall be legibly marked in the field as directed by the engineer to indicate the equipment has been applied with a series combination rating. The marking shall meet the requirements in 110.21(B) and shall be readily visible and state the following.
CAUTION-ENGINEERED SERIES COMBINATION SYSTEM RATED_________AMPERES. IDENTIFIED REPLACEMENT COMPONETS REQUIRED.
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