Apparatus and methods pertaining to a moveable well construction apparatus to be electrically energized via an electrical power transmission path extending between a stationary power source and the moveable well construction apparatus. The path comprises cables and connectors. A system comprises a detector operable for generating information indicative of whether the path is properly installed. The system permits the path to be electrically energized when the detector-generated information indicates the path is properly installed, and prevents the path from being electrically energized when the detector-generated information indicates the path is not properly installed.

Apparatus and methods pertaining to a moveable well construction apparatus to be electrically energized via an electrical power transmission path extending between a stationary power source and the moveable well construction apparatus. The path comprises cables and connectors. A system comprises a detector operable for generating information indicative of whether the path is properly installed. The system permits the path to be electrically energized when the detector-generated information indicates the path is properly installed, and prevents the path from being electrically energized when the detector-generated information indicates the path is not properly installed.

Apparatus and methods pertaining to a moveable well construction apparatus to be electrically energized via an electrical power transmission path extending between a stationary power source and the moveable well construction apparatus. The path comprises cables and connectors. A system comprises a detector operable for generating information indicative of whether the path is properly installed. The system permits the path to be electrically energized when the detector-generated information indicates the path is properly installed, and prevents the path from being electrically energized when the detector-generated information indicates the path is not properly installed.

A cam lock has a lock cylinder and a cam part connected to the lock cylinder. The cam part is turnable from a lock position to an open position when turning a key placed in the lock cylinder. The cam part comprises a spring and a flange that is arranged to receive external force towards the lock cylinder. The spring allows the movement of the cam part at the open position towards the lock cylinder as response to external force. The spring is further arranged to turn the cam part towards the lock position.

A cam lock has a lock cylinder and a cam part connected to the lock cylinder. The cam part is turnable from a lock position to an open position when turning a key placed in the lock cylinder. The cam part comprises a spring and a flange that is arranged to receive external force towards the lock cylinder. The spring allows the movement of the cam part at the open position towards the lock cylinder as response to external force. The spring is further arranged to turn the cam part towards the lock position.

In an interlock system, locking of a second locking mechanism is enabled only when a first key holding part holds a first key and a control device is in a state in which a residual voltage of the control device is not discharged. Application of a power supply voltage to the control device is enabled by switching of a ground switch only when a second key holding part holds a second key. Removal of the second key from the second key holding part is enabled only when the ground switch is in the grounded position and the control device is in a grounded state. Removal of the first key from the first key holding part is enabled only when the control device is in a state in which residual voltage is discharged.

In an interlock system, locking of a second locking mechanism is enabled only when a first key holding part holds a first key and a control device is in a state in which a residual voltage of the control device is not discharged. Application of a power supply voltage to the control device is enabled by switching of a ground switch only when a second key holding part holds a second key. Removal of the second key from the second key holding part is enabled only when the ground switch is in the grounded position and the control device is in a grounded state. Removal of the first key from the first key holding part is enabled only when the control device is in a state in which residual voltage is discharged.

A cam lock according to the invention has a lock cylinder and a cam part connected to the lock cylinder. The cam part is turnable from a lock position to an open position when turning a key placed in the lock cylinder. The cam part comprises a spring and a flange that is arranged to receive external force towards the lock cylinder. The spring allows the movement of the cam part at the open position towards the lock cylinder as response to external force. The spring is further arranged to turn the cam part towards the lock position.

A cam lock according to the invention has a lock cylinder and a cam part connected to the lock cylinder. The cam part is turnable from a lock position to an open position when turning a key placed in the lock cylinder. The cam part comprises a spring and a flange that is arranged to receive external force towards the lock cylinder. The spring allows the movement of the cam part at the open position towards the lock cylinder as response to external force. The spring is further arranged to turn the cam part towards the lock position.

Certain embodiments described herein are directed to lock inserts that are configured to prevent removal of a key from a lock assembly comprising the lock insert when the lock assembly is in an unlocked position. The lock insert can be configured to permit removal of the key when the lock assembly is in a locked position.