ElectricLockOptions

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This discussion has been superseded by an actual implementation (yet to be documented)

Requirements:

External key override, for the case of software failure
Able to exit in a fire - either thumbturn, or handle.
Ideally in power outage door stays locked, so fail-secure, so long as fire safety is not compromised

Notes

Battery backup could be used to provide longer operation of an exit button, but probably can't be relied upon.
Battery backup power supplies start around £25 https://www.electriclock.net/acatalog/regulated-power-supplies.html
We have several UPS's full of 12v batteries

Fail-safe options:

Fail-safe options can be considered but would mean building is insecure after battery backup fails

Magnetic lock

e.g. £40 http://www.screwfix.com/p/deedlock-dual-12-24v-dc-single-magnetic-door-lock/68309
Pros: Easy to fit, cheap, can be push button release for fire safety
Cons: Fails-open, no hardware override for software failure

Bracken's yet another option???

eg release from £20 https://www.electriclock.net/acatalog/dorcus-electric-releases.html
Rim mounted nightlatches start around £30 in B&Q, or something like http://www.screwfix.com/c/ironmongery-security/bs-night-latches/cat810334 from £60

       _____________
       |           |
       |           |
       |           |<----Electric fail-safe strike with RFID/NFC = protokey (battery backup optional)
       |         ^-|-----Mechanical latch, internal handle, external key, backup only.
       |           |
       |           |
       |         <-|-----Current mechanical deadbolt with key = key
       |           |
_______|___________|______

Pros

Safe, can always escape unless keyholder locks protokeyholder and/or guest inside. Power/software failure not an issue.
Cheap and simple, easier to choose parts, protokey half needs not be heavy.
Secure, by virtue of the existing deadbolt (is it actually a deadbolt)? (yes, but no idea of security rating -AP)
Keyholder can always open/close space in power failure.

Cons

Keyholders also need protokey. (Is this a problem? -AP)
Malicious revoked keyholder can get in in power/backup failure.
Second backup key required for software failure, not power failure. (This is true for all options) -AP
Physical keys required to be cut for each new keyholder
More parts involved

Fail-secure Options:

Fail-secure options must have internal physical override for fire-escape in the event of power failure

Electric Nightlatch:

e.g. £84 http://electriclock.co.uk/acatalog/cisa-electric-locks.html
Pros: Easy to fit, internal fitting. External key override, fails secure
Cons: Internal release is electronic or key in the case of fire!
May be possible to refit internal key with knob, but unsure

Eletric release/strike with mortice lock:

e.g. £20 plus https://www.electriclock.net/acatalog/dorcus-electric-releases.html
Pros: Cheap. Fail secure. Mortice key override for external access
Cons: Would need new mortice lock to allow emergency exit in power failure without a key
Probably need to buy a more expensive option, the cheap ones probably aren't heavy enough duty

Another option?

£192 http://electriclock.co.uk/acatalog/taylor-t3558_series-electric-lock.html
Pros: cylinder release for external override, handle internal. Fails secure. heavy duty
Cons: Cylinder is not included. Unclear if handle is included. Would we have to cover existing handle hold externally?

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