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

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

----- Original Message -----
From: "Jim Leng" <[email protected]>
To: <[email protected]>
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
>
>
>
>
> 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
>
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