_______ at other than dwelling units shall be legibly field marked with the maximum available fault current , include the date of the fault-current calculation was performed, and be of sufficient durability to withstand the environment involved.

When modifications to the electrical installation occur that affect the maximum available fault current at the service, the maximum available fault current shall be verified or _____ as necessary to ensure the service equipment ratings are sufficient for the maximum available fault current at the line terminals of the equipment.

The required working space for access to live parts of equipment operating at 300 volts-to-ground , where there are exposed live parts on one side and grounded parts on the other side, is ________

Working space shall not be used for _______.