AC Power Wiring colors

According to International Electrical Commission standard IEC60445:2010, for AC power the following color codes should be used.

Check if the country where you are adheres to the standard!

See also outdated IEC60446.

  • Grounding symbol = protective conductor = green/yellow
  • N = Neutral conductor = blue
  • L = AC Phase conductors
    • L1 = brown (or just L for single AC phase)
    • L2 = black
    • L3 = grey

Plain Text Messages in Apple Mail

I am a fan of plain text, so I prefer using plain text mails whenever possible. Here is how you do it for Apple Mail ( OS X El Capitan, but probably works on most versions).

Change the (default) format  for all messages:

  • go to Mail > Preferences, click Composing, then choose Plain Text as Message Format.

Change format of the current message:

  • go to Format > Make Rich Text > Make Plain Text

Reply to messages in the same format you received them:

  • go to Mail > Preferences, click Composing, then select Use the same message format as the original message

Most probably you will also want to use fixed-width font for plain text messages. So, go to Mail > Preferences > Fonts & Colors and choose Use fixed-width font for plain text messages