Type systems, database normalisation, reactive programming (i.e.: non-manual state management), or more generally making illegal states unrepresentable are the software equivalents!
E - Establish (Identify all sources)
S - Switch (Disconnect)
V - Verify (Visually check, if possible)
R - Release (Stored energy)
L - Lockout/Tagout
T - Test (Absence of voltage)
G - Ground (If necessary)
Renergize - Re-energizing Equipment
> In modern days, most cars have an anti-theft feature that restricts the turning of the steering wheel if the key is not inserted in the ignition
This needs updating:
> In the past, most cars had an anti-theft feature that restricted the turning of the steering wheel if the key was not inserted in the ignition. These days, for convenience, is enough that the key has been in the vicinity of the car in the recent past.
It’s a lemon market, as a car buyer there are no outward telling features whether the keyless entry system is susceptible to repeater attacks (most new cars still are), whether just anyone briefly inside the car can register new keys, whether it uses strong crypto, or whether a couple grand buy you a master key that unlocks and puts into drive most cars of a brand (famously Kia/Hyundai to this day, who also have all of the other vulnerabilities). Car reviews don’t mention any of these things, even when they are definitely known and tested (rarely) by some third parties. Strangely, not even the OEMs who have secure systems use them for advertising.
> Defeatable interlocks are allowed on electrical equipment up to 600 volts.
Fun fact, "high voltage" starts at 600v according to many regulatory bodies. 1kv is another popular threshold.
The blast pressure from an arc can get to a point where protective gear is irrelevant. Copper expands something like 30000x when it vaporizes.
Type systems, database normalisation, reactive programming (i.e.: non-manual state management), or more generally making illegal states unrepresentable are the software equivalents!
> In modern days, most cars have an anti-theft feature that restricts the turning of the steering wheel if the key is not inserted in the ignition
This needs updating:
> In the past, most cars had an anti-theft feature that restricted the turning of the steering wheel if the key was not inserted in the ignition. These days, for convenience, is enough that the key has been in the vicinity of the car in the recent past.
It’s a lemon market, as a car buyer there are no outward telling features whether the keyless entry system is susceptible to repeater attacks (most new cars still are), whether just anyone briefly inside the car can register new keys, whether it uses strong crypto, or whether a couple grand buy you a master key that unlocks and puts into drive most cars of a brand (famously Kia/Hyundai to this day, who also have all of the other vulnerabilities). Car reviews don’t mention any of these things, even when they are definitely known and tested (rarely) by some third parties. Strangely, not even the OEMs who have secure systems use them for advertising.