John,

----- Original Message ----- 
From: "John Woodgate" <[email protected]>
>
> They are usually quite well shielded for electric fields, and the EMC 
> standards are rather 'soft' on magnetic fields because they rarely cause 
> problems.

It happened that each time the solenoid was de-energised, our controller was 
reset and than energised it again - there were no way to open the door. The 
reason was no diode installed at solenoid.

Piotr Galka 

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