- (a) A machine brake of the electrically-released, spring-applied type shall be provided. Self-locking drives utilizing a lead-screw or other positive gearing which will stop and hold the carriage with rated load within four inches of down travel after power is removed are excepted.
- (b) The driving machine shall be directly connected to the motor, or may be connected to the motor by multiple V-belts, or by a multiple-link, belt-type chain. Where a chain-drive or belt-drive machine is used, a broken-chain or broken-belt device shall be provided to remove power from the motor and brake if the chain or belt fails or slackens.