6 ms·
A previous employer's office had electronically locked doors (magnetic, I think?). The studio head said that they were designed to 'fail open' (i.e. unlocked) i
by kevingadd 10y ago
A previous employer's office had electronically locked doors (magnetic, I think?). The studio head said that they were designed to 'fail open' (i.e. unlocked) in the case of a power outage. Then the power went out a couple weeks later, and the doors were locked.
Oops.
Our emergency exits were old-fashioned analog doors and still worked, at least.
- hackermailman 10y agoI once worked somewhere with magnetic locks and a decent shove easily opened the door. We did this for smoke breaks as our magstripe cards noted every time we left the control room.
- bitJericho 10y agoI've installed these doors. It's easy to mess up as the switch to determine the failure mode is part of the equipment. This was an untested install.
- cube00 10y agoHow does a mag lock fail closed with no power? Or are you talking about one of those strikes near the latch?
- kosievdmerwe 10y agoBatteries, I would guess. It's pretty bad if your security system allows entry to people when there is a black out.
- userbinator 10y agoElectromagnet locks --- which have an electromagnet in them to keep the door closed and are surprisingly strong for their size --- are truly fail-open since loss of power means loss of force keeping the door locked, but those doors might've also had an additional fail-closed type of electric lock that requires a brief pulse of power to open. https://en.wikipedia.org/wiki/Electromagnetic_lock https://en.wikipedia.org/wiki/Electromagnetic_lock