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Although the use of this copper tubing as a fuse was only to be used for a short time, it still doesn’t excuse the fact that this is a Code violation. In fact, the other two fuses were just about on their last legs anyway. The fuse rejection feature shows that they too were not proper for the type of fuseholders in this switch.
The only way to be sure that the overcurrent devices at this facility are correct is to begin with the basic information that will provide the answers to the requirements found in Art. 430, and some others throughout the Code.