Adjustable cable lockout the length of the cable lock can be adjusted according to the field environment for short-term isolation during maintenance and repair or for long-term indefinite locking of valves and circuit breakers. During maintenance and repair, a maximum of four padlocks can be used, each belonging to a different maintenance staff. Only after all workers have completed their work and removed their personal locks can the cable locks be removed and the valve operation (or circuit breaker switch) be restored.