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Noddy347

Rack Grounding

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Approx 12mths ago i moved all my AV gear into a 19" commercial rack, a 22ru from memory. Now i was wondering if all the Av gear is grounded via the earth on the power cords? The rack is packed full of equipment and power boards.

 

Do i need to look at grounding gear that doesn't have a earth of the plug lead? I do find every now and then i'l feel a tingle through the rack when working on the rear of something and touching the rack at the same time.

 

These are probably newbie questions but i have no idea regarding earthing equipment.

 

matt.

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There are two types of electrical equipment classes, with safety regulations for each appliance's design to meet:

  • Class 1 equipment requires a ground for earth safety protection - these require have a three-pin electrical cable and plug.
  • Class 2 equipment has additional insulation in the design and does not require a three-pin three-pin electrical cable and plug.  They will often have a two-pin electrical cable/plug, if they use a three-pin plug the earth is probably not used.  Class 2 equipment can be identified with a double-square symbol.  CD players are often Class 2. 

Some av gear will have a ground/earth connection used to manage audio earth hum - especially in a turntable (ground lead from tt to the amp).  This is different to the earth lead on the power cable, which is about electrical safety. 

 

Your equipment rack does not need grounding.  All equipment will be isolated from it (rubber feet) and not be connected by wires. 

 

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On 21/04/2019 at 6:32 PM, audiofeline said:

There are two types of electrical equipment classes, with safety regulations for each appliance's design to meet:

  • Class 1 equipment requires a ground for earth safety protection - these require have a three-pin electrical cable and plug.
  • Class 2 equipment has additional insulation in the design and does not require a three-pin three-pin electrical cable and plug.  They will often have a two-pin electrical cable/plug, if they use a three-pin plug the earth is probably not used.  Class 2 equipment can be identified with a double-square symbol.  CD players are often Class 2. 

Some av gear will have a ground/earth connection used to manage audio earth hum - especially in a turntable (ground lead from tt to the amp).  This is different to the earth lead on the power cable, which is about electrical safety. 

 

Your equipment rack does not need grounding.  All equipment will be isolated from it (rubber feet) and not be connected by wires. 

 

Sweet, thanks for the detailed reply. Much appreciated.

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