Re: [SI-LIST] : Number of GND/Power pins in a connector ?

About this list Date view Thread view Subject view Author view

From: Adrian Shiner (adrian.shiner@virgin.net)
Date: Mon Mar 27 2000 - 11:25:54 PST


Jim,

This is where the use of hazard and risk assessment should come into
play...the power (VA) applied to a component and it's ability to disipate
the power determines whether the component remains relatively cool to the
touch or blows up in your face. Hence the problems of drilling through a
power cable...liquid copper flies everywhere.

 The variation in current resultant from 60 volts peak or 77.77 volts peak
(55 volts AC to ground) applied to a human body depends more on the
individual and its environment than the difference in voltage. For a
practical example of that at higher voltages, I am sure there is documented
witness evidence of elctric chair executions in the USA to review.... In the
UK we have have nothing to offer in that particular field.

Best wishes

Adrian
----- Original Message -----
From: "Jim Leng" <jleng@nortelnetworks.com>
To: <si-list@silab.eng.sun.com>
Sent: 27 March 2000 19:41
Subject: Re: [SI-LIST] : Number of GND/Power pins in a connector ?

> Hi Rick,
>
> You are correct for 42.4 V peak to peak or 60Vdc for SELV. However, the
> hazardous energy limit is 240VA at 2V or higher. Thus, it depends upon
> Voltage to define the current limit. I hope that I answered your
> question, Let me know if it is not clear.
>
> Regards,
>
> Jim
>
> At 07:44 AM 03/27/2000 -0800, Rick Brooks wrote:
>
> >>>>
>
> <excerpt>Re: [SI-LIST] : Number of GND/Power pins in a connector ?
>
>
> Jim,
>
>
> is this correct, that the highest voltage allowed under UL for SELV is
> 42.4V?
>
>
> Also, is the wattage limit 15 watts?
>
>
>
> - Rick
>
>
>
>
>
>
> At 06:35 PM 03/24/2000 -0800, you wrote: =20
>
>
> >>>> =20
>
>
> Adrian, =20
>
>
> In the US, the UL ELV limit is 42.4V. They used to look the other way
> at
> telco battery voltage, but no longer, =20
>
>
> Regards, =20
>
>
>
> Steve =20
>
> **** To unsubscribe from si-list or si-list-digest: send e-mail to
majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE si-list
or UNSUBSCRIBE si-list-digest, for more help, put HELP.
> si-list archives are accessible at http://www.qsl.net/wb6tpu
> ****
>

**** To unsubscribe from si-list or si-list-digest: send e-mail to majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE si-list or UNSUBSCRIBE si-list-digest, for more help, put HELP.
si-list archives are accessible at http://www.qsl.net/wb6tpu
****


About this list Date view Thread view Subject view Author view

This archive was generated by hypermail 2b29 : Thu Apr 20 2000 - 11:35:56 PDT