Terminal Box design shall enable ingoing cable(s) to be taken from the entry point(s) to the connections in such a way that chafing against connections or other parts is obviated. Terminal bar or block assembly design shall be such that insulation shrinkage shall not impair the effectiveness of electrical connections. Adequate locking arrangements shall be provided to prevent vibration, causing connections to slacken. The enclosure for the terminal box shall be at least equal to that for the main enclosure.