The difference between using grounding cables separate for a mat or wrist strap as opposed to a common point ground is primarily ergonomic.
Do i need a anti static building mat and wristband.
They are normally used along with an antistatic mat that are placed on the working bench.
You do not need an anti static mat or wrist strap.
I am very careful though and a perfectionist so i handle each piece.
Unless 30 40 is really gonna cause some problems you might as well own one.
Make sure you have one hand or your forearm touching some metal part of the case while working.
I alwyas build mine on the carpet floor while sitting down and i never use an anti static wristband even though i know i should.
The wristband works by redirecting the static discharge through a cord which then follows an antistatic mat or another grounded conductor to the ground.
I am a field tech and have never carried around a mat or strap.
However having the mat and the wrist strap grounded at the same point does keep them in electrical balance.
It is best to have it plugged up and unplug the power connector off the motherboard.
By redirecting the static these wristband devices assist in properly grounding your body balancing out any electrical charge differences between you and electrical parts.
I wear one on my ankle.
Just take the other necessary precautions.
Here are some more details about anti static wristband.
There s pretty much no reason not to own one.
Dude an esd safe mat with a grounding cable and a wristband costs like 30.