This is a case where game design breaks common sense.
How so?
Do you want the long answer or the short answer?
Lets ignore all the SR stuff, and just talk real security systems.
You can buy a cheap home system for anywhere from $75 to $1500... On the cheap end, you have wireless cameras* with motion sensors.
On the top end, you have barometric sensors, window alarms, door bars, and sirens. (NONE of it wifi)
When you get into
actual security systems that you would install to protect a corporate commercial facility, you are talking $100,000 to $1,000,000.
The difference comes in, in how it is all installed and ran.
A security of this type is powered by a separate feeder circuit from the main power system, and comes equipped with a measured battery backup system (usually 72 hours), meaning even if the entire town went dark, the system still runs.
All devices are installed and wired in EMT, and mounted in a 6 mils (2mm) security box (stainless steel). fasteners used are Torix Security fasteners... which is not a tool you can pick up at a hardware store.
All the devices are direct wired back to a separate node based on device, location, and function. (this allows the parts of the system to be disabled while leaving the other systems online. You don't need motion sensors active during the workday when hundreds of people are going to be tripping them.) From there, the signal is then outputted to various in house devices (monitoring stations.) IF an outside feed is needed (remote observation), a separate out feed station will be installed. This Outfeed station will not have direct access back to node control (output only).
And this assumes you just want to keep the lookie-loos out. If you want to keep something in... Well, that's a step up.
Now everything goes into Rigid conduit, your device boxes are 16mills (6mm) of stainless steel, and you move to welded fasteners and/or individualized fasteners (so.. if you have 4 fastener ports, you'd use a Torix in 1, Robinson in 2, a Philliips in 3, and Hex in 4) requiring a separate tool for each fastener.
Electronically, the systems are same in node wiring, but you triple up on back-up systems and independent supplies (so instead of 72 hours battery supply, you size for 11 days).
That's the basics I can get away with telling without breaking an NDAs with the equipment providers...
The BIGGEST mistake Shadowrun makes with all its devices is that it forgets those devices need power, and since they need power, you might as well run the signal cable as well, as they both go to the same spot (remember, the security system worth its salt has an independent power supply)
But in Shadowrun... all devices.. be that a Maglock, a camera, or even a drone! Doesn't need power. its just assumed they run on... I guess on cupcakes and fee-fees?
What's the Difference in the structures of these 2 systems.. Well the first one, if I need/want to, I can use a bi-metal blade in a circular saw and be through the EMT in about 3 seconds. (its what I use to cut the EMT in the first place.) and the boxes will come apart with a hammer and some time...
the Rigid conduit takes about 1 minute to cut through using a metal band saw (a circular saw will just bind and shatter!), and the boxes will withstand up to a .357 magnum. Pound on it all day with a hammer, you'll bent them up good, but not break inside.)