2 core flex 0.5mm or 0.75mm

[goofyhumor]

I'm getting in some cable for my brother in law to fit fused spur and then alarm control panel to fused spur (he works as an electrician for company) I want to connect my wireless alarm control panel to an 3a fused spur. I'm figuring 2 core flex 0.5mm should be ample but I'm guessing if I get the 0.75mm then that will be fine to use too or better just to use 0.75mm anyway as cost difference is so minimal for what will be like 1 metre of cable?

 

[ricicle]

Why isn't your brother-in-law getting the cable ?

Is the alarm panel class 2 ?

 

[ericmark]

Table 52.3 - Minimum cross-sectional area of conductors

Only allows 0.75 mm sq cable for power circuits so don't even know why any outlet would stock 0.5 mm sq cable.

NOTE 1: In signalling and control circuits intended for electronic equipment a minimum cross-sectional area of 0.1mm² is permitted.

So maybe Maplin would stock 0.5 mm but would not expect to see it in the DIY sheds.

 

[plugwash]

because beleive it or not flex is used for things other than fixed wiring. Afaict 0.5mm is perfectly acceptable for appliance flexes and pendant drops.

 

[goofyhumor]

He is on holiday this week in Spain, so will be coming round at weekend before he is back in work and his van and wires are in work.

There is a table on DIY Not that gives maximum values for cables at //www.diynot.com/pages/el/el003.php which says up to 3 amps and 720 watts, but I'm assuming it doesn't really matter if you get flex that takes more wattage and amps, assuming you can't overkill going the other way?

It's a Visonic class 2 alarm. I'm quite competent at DIY, just not electrics and like to be sure when it comes to electricity.

 

[ricicle]

He is on holiday this week in Spain....

Ah - you should have said. We all know him well on here