AUXILIARY GUTTERS

70-295 374-6. Ampacity of Conductors. Where the number of current-carrying conductors contained in the auxiliary gutter is thirty or less, the correction factors specified in Article 310, Note 8(a) of Notes to Ampacity Tables of 0 to 2000 Volts shall not apply. The current carried continuously in bare copper bars in auxiliary gutters shall not exceed 1000 amperes per square inch (645 sq mm) of cross section of the conductor. For aluminum bars, the current carried continuously shall not exceed 700 amperes per square inch (645 sq mm) of cross section of the conductor. 374-7. Clearance of Bare Live Parts. Bare conductors shall be securely and rigidly supported so that the minimum clearance between bare currentcarrying metal parts of opposite polarities mounted on the same surface will not be less than 2 inches (50.8 mm), nor less than 1 inch (25.4 mm) for parts that are held free in the air. A clearance not less than 1 inch (25.4 mm) shall be secured between bare current-carrying metal parts and any metal surface. Adequate provisions shall be made for the expansion and contraction of busbars. 374-8. Splices and Taps. Splices and taps shall comply with (a) through (d) below. (a) Within Gutters. Splices or taps shall be permitted within gutters where they are accessible by means of removable covers or doors. The conductors, including splices and taps, shall not fill the gutter to more than 75 percent of its area. (b) Bare Conductors. Taps from bare conductors shall leave the gutter opposite their terminal connections, and conductors shall not be brought in contact with uninsulated current-carrying parts of opposite polarity. (c) Suitably Identified. All taps shall be suitably identified at the gutter as to the circuit or equipment that they supply. (d) Overcurrent Protection. Tap connections from conductors in auxiliary gutters shall be provided with overcurrent protection as required in