Yep - no doubt. The whole board is effectively at mains potential. Even adj= usting the trimpot could "tingly" at the least. External wiring to the "key= " needs to be mains rated, as does the switch attached. No sign of any compliance marks either (any wonder?) Wouldn't be for me and mine... Stephen -----Original Message----- From: piclist-bounces@mit.edu On Behalf Of James = Cameron Sent: Friday, 20 July 2018 6:35 AM To: Microcontroller discussion list - Public. Subject: Re: [EE] Is this safe? I agree with Sean. I'd use 240V wiring standards for taking the trigger input away from the bo= undary of a product casing or back of a light switch plate. It isn't clear from the description if the product can work reliably with a= remote trigger. Description also suggests it will power on each time an u= nreliable grid comes up, "Power on and trigger to connect", which may not b= e wanted. p.s. the 240V standards here are called "low voltage" most of the time, so = I had to recalibrate my reading glasses. ;-) On Thu, Jul 19, 2018 at 08:08:24PM +0100, David C Brown wrote: > https://www.amazon.co.uk/s/ref=3Dnb_sb_noss?url=3Dsearch-alias%3Daps&fiel= d > -keywords=3DAC+220V+Timer+Delay+Switch+Module+Input%2FOutput+Turn+Off+Bo > ard+Time+ >=20 > I need a timer to control outdoor lamps on my "estate". Using a module > like the one above would have the advantage that the operating=20 > switches - all outdoor - would be at a low voltage, meaning that the=20 > wiring is less onerous. >=20 > But my concern is that the isolation between the 240vac and the the "cold= " > trigger terminals may not be adequate. My worry is that a failure could > put the 240v onto the trigger wires. >=20 > Looking at the pictures there is obviously no full isolation between=20 > 240v and low voltage , nor can I see a properly rated capacitor.. >=20 > Comments welcomed >=20 > __________________________________________ > David C Brown > 43 Bings Road > Whaley Bridge > High Peak Phone: 01663 733236 > Derbyshire eMail: dcb.home@gmail.com > SK23 7ND web: www.bings-knowle.co.uk/dcb > >=20 >=20 >=20 > *Sent from my etch-a-sketch* > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive=20 > View/change your membership options at=20 > http://mailman.mit.edu/mailman/listinfo/piclist -- James Cameron http://quozl.netrek.org/ -- http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/chang= e your membership options at http://mailman.mit.edu/mailman/listinfo/piclis= t --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .