Power supply w/o ground

[Phil Allison]

"Al in Dallas" <

I've never noticed his technical advice to be incorrect.

** Right you are.

Of course, he
doesn't give technical advice as often as he spews abuse.

** Posting specific criticisms and verbal self defence are not abuse.

YOUR post IS 10% abuse as it is not specific t any matter and presents
your erroneous conclusion as fact.




........ Phil

 

[Rich Grise]

On Mon, 24 Sep 2007 16:57:05 -0400, JT wrote:

A small open-frame line powered power supply (Cincom CFM05S033) doesn't
have a ground connection. It will power a tiny device which only has
+3.3V/0V DC connections. This will be used in a 6x6x4 plastic enclosure
so there is no chassis ground. An electrician will be wiring it in.

Is this inherently unsafe? Do I need to find another supply with a ground?

It sounds like it's probably an isolated supply. The only Earth ground
you should need should be the frame of the supply - i.e., any metal that
a person could touch.

If your device needs a real earth ground, then just tie them together
at one common point.

Otherwise, there should be no problem using it - imagine a 2-prong
wall wart, for example.

Good Luck!
Rich

 

[Al in Dallas]

On Thu, 27 Sep 2007 13:13:03 +1000, "Phil Allison"
<philallison@tpg.com.au> wrote:

"Al in Dallas"

I've never noticed his technical advice to be incorrect.


** Right you are.


Of course, he
doesn't give technical advice as often as he spews abuse.


** Posting specific criticisms and verbal self defence are not abuse.

YOUR post IS 10% abuse as it is not specific t any matter and presents
your erroneous conclusion as fact.

Anyone can count how often you use abusive terms such as "fuckwit."
They can also count how often you post technical information without
being abusive. And I can count.

--
Al in St. Lou

 

[Phil Allison]

"Al in Dallas"

I've never noticed his technical advice to be incorrect.


** Right you are.


Of course, he
doesn't give technical advice as often as he spews abuse.


** Posting specific criticisms and verbal self defence are not abuse.

YOUR post IS 10% abuse as it is not specific t any matter and presents
your erroneous conclusion as fact.

Anyone can count how often you use abusive terms such as "fuckwit."

** The use of colourful language is not proof of abuse.

Posting specific criticisms and verbal self defence are NOT abuse.

They can also count how often you post technical information without
being abusive. And I can count.

** Shame you cannot think.

You just see words on a screen but have no idea what it all means.


....... Phil