Electrical outlets are normally the best ground for a mat in any building.
Do i need an antistatic mat to build a pc.
You do not need an anti static mat or wrist strap.
Just take the other necessary precautions.
Since carbon is conductive if the mat is laid on top of conducting tables and floors static will travel through the mat into the table and dissipate at the floor into the ground.
The wrist strap is not necessary as long as you and the computer are grounded to a common point.
If i handle a bare mainboard i use an esd mat too but when i just add components into an existing pc there is no point in using a mat.
However typically you will want to connect an anti static mat for pc building to an electrical outlet.
Do i really need an anti static work mat.
That is why i always use a wrist strap and wear cotton clothing when working on hardware.
Anti static mat esd mat with wrist strap and grounding cord auory silicone soldering mat heat resistant 932 f for phone computer laptop electronics repair assembly 15 8 x 11 8 gray 5 0 out of 5 stars 3.
Make sure you have one hand or your forearm touching some metal part of the case while working.
It is best to have it plugged up and unplug the power connector off the motherboard.
I am a field tech and have never carried around a mat or strap.