=09


If you are going this route, you need to make sure that the isolation provi=
ded by the optocoupler is adequate. It needs double/reinforced insulation a=
nd a withstand voltage of between 3000 and 4000 V AC rms (depending on=
 standard it should comply with). Required creepage distance could be as hi=
gh as 8mm which means that you need an optocoupler with "wide" pin configur=
ation.

Many standards needs this type of component (components with high integrity=
 characteristic - one fault could lead to unacceptable risk) to b=
e routine tested (each individual example is tested for electrical withstan=
d, not just type tested by the manufacturer).

You still need "safe" power on the insulated side of the opto coupler (the =
led side).

There are no shortcuts when it comes to insulation and safety.


/Ruben

Den Fri, 20 Jul 2018 16:34:13 +0530, Manu Abraham  skrev:

A quick suggestion: If you still want to use that module and still want
the isolation, connect an optocoupler to the control interface, which will
give an adequate isolation. Just that you will need to tinker with it.

Cheers,
Manu


On Fri, Jul 20, 2018 at 3:49 PM, David C Brown  wrote:
> Thank you all for your advice. It is clear that this module is not saf=
e
> enough to use in the way I envisaged. I am now tending towards using
> wireless remote control modules. Twenty feet of air, even humid air, i=
s a
> damn fine piece of isolation. :-)
>
> __________________________________________
> 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
>
>
>
> *Sent from my etch-a-sketch*
>
> On 20 July 2018 at 08:30, RussellMc  wrote:
>
>> That looks good as an example - BUT: any add on solution needs to =
be
>> checked to ensure that it fixes the isolation issue and does not h=
ave
>> issues of its own.
>>
>> Russell
>>
>>
>>
>> On 20 July 2018 at 11:22, Allen Mulvey  wrote:
>>
>> > While looking for something else I came across this:
>> > Enclosed Pre-Wired Relay
>> > https://www.ebay.com/itm/RIB-Functional-Devices-RIBU2C-Enclo
>> > sed-Pre-Wired-Relay-120-277VAC-10A/282946266423?epid=3D226103=
5
>> > 387&hash=3Ditem41e0e96537%3Ag%3AkTIAAOSwqxRa52aB&_sac=
at=3D0&_nkw
>> > =3Denclosed+pre-wired+relay&_from=3DR40&rt=3Dnc&L=
H_TitleDesc=3D0
>> >
>> > Use the 555 module to switch this one as Russell suggests.
>> >
>> > Allen
>> >
>> --
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