sixwheeledbeast

SCB where designed that way. Tamper return will be +ve if the HO is +ve, you can see the tamper link is still fitted

So it's for an old SCB then

I would test with a meter first but I assume:- 12v+ = +ve 12v- = trig HO = -ve ST = tamp return B = beacon? strobe Failing that the 999 D'COM terminals are likely negative sinking panic and intruder.

Aux + -, HO and ST over on the left would be may guess.

Blown a fuse in the main controls. When was the last time the system was serviced? Maybe worth considering having a service if it's been a while.

I would argue that's completely different a modem has speed limitations. If a modem could do broadband speeds without having to have the line engaged it may still be in use. There are a good few companies that still prefer fax for example. The time to be received is similar to an email so it's still fit for purpose.

Phone line polarity hasn't been an issue for 20 years or more. All approved devices had to be made compatible with either polarity, starting around the touchtone era, well on POTS stuff anyway. I would still use foil on glass if required, you say it's passed it. I'd say it's proven and works well in the right situation.

I would say any ethernet device would be how to decide on the products origin. Why use Hik cameras and trap your self to TVI DVR when you could use a vast choice of other 4 format cameras if using analogue solution.

Yes I also have a Besson one. Solid piece of kit Works fine for me at the moment

As above if you are experienced you can tell a good bit from how the fuse blows. The greater the load the more the fuse wire goes splat. Also make sure you replace for the exact same value, it's too easy to fit the wrong fuse as 20mm come in a variety of ratings.

One of those 700L rebrands I believe. If you can find a keypad just swap it over, although you maybe better just upgrading for something that comes as a panel and keypad if you feel competent to do that.

I recall it as 15 minute activation not 30 minutes. Seen as the bell timer would be 15 minutes the alarm current after 15 minutes will be different on an SAB. Was sure the standard says something along the lines of "12 (24) hours standby including one full activation"? Still useful chart tho, not a bad thing to be overspec standby capacity wise.

Texe have a wireless smoke kit that will work independently but it's not Exodus brand it's Rick O Shea. I would use something like Aico 180 Series for low voltage supply. Fire alarm controls a bit overkill for your standard domestic house.

Only issue with Texe ones is they rely on a working alarm system and have no redundancy if the alarm fails, in any fault or fire condition. Just something to consider.

From what I can find out Iso-Tech are RS rebrands, most seem discontinued and now rebranded as RS Pro. https://uk.rs-online.com/web/p/digital-multimeters/8732367/ As I say above if your looking for a quality meter new you can't beat the Fluke 117. I wouldn't be without the Non contact, Auto-V and Lo-Z features now. If I where looking again I'd consider the 117/323 combo kit can be handy to have a clamp meter in some situations.

You forgot to replace the fixed housings for Swann bullets... It's one way wireless and not worth the electricity to power it. Just as effective to throw some dummies up with flasher modules if you want cheap.

Why Texe? Would have to be RR if you consider the kitchen or garage sensor to be exposed to dust, car fumes, cooking fumes, steam etc. OH would detect a smouldering fire quicker tho.

Yes technically "wrong" too. Cut the cable and you have no siren. Even as a second line of defence, on low risk it's a waste of time fitting Yale DIY IMO.

Pile of DIY rubbish not designed to be wired, would be better to reuse the existing wiring and upgrade what you have IMO.

If you went for a drink the following day you could have picked a meter up for £20.

Popular and nicked from work or out of engineers vans...

A or T next to the zone name in the walk test.

Can't beat a Fluke 117 for general purpose DMM.

38mm is used most, I guess DNO asked for 50mm? Can they get them to order? Quick look online most 50mm hits are in Ireland. https://www.amazon.co.uk//dp/B01NA0U7NP

Builders merchant or electrical wholesaler. I would expect them to have 38mm ones in stock anyway.