Re: Remote Power Supply Connection

BretLudwig wrote:
> 
>  No, if you DIY you ARE designing for yourself. That's why DIY can be
> superior, you don't have to accomodate all possible variations and
cases.
> If you do you might as well buy factory made.
> 
>  Outboard PS is the standard in tube serious RF gear, pro and amateur.
> Look carefully at Collins S-Line. The Measurements 59 grid dipper too.
> 
>  That said you can "punk out" like manley did on their dual chassis
> monoblocks-rigidly connect them with bars and run wiring internally. But
> why when you don't have to?
> 
> --
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I will offer my client here the option of a stand on which to 
place his 845 amps so thay are at least 400mm off the floor so reaching
the on switch 
is OK.
The separate PSU can be fixed into the bottom of the stands.

But if not, its OK.

PSU can be on the floor, and amps can be on a usual common 750mm high
table.

I have 12 wires from PSU to amp. There are two mobile crane cables with
5 wires within each with 
heavy double insulation and rated for 450V 3 phase power at 15 amps per
wire.
the other two wires are inside a normal heavy duty 2 way mains cable.

The pair of octal plugs are set up so -600V is in one plug, +640V in the
other.

16 conectors are available in each channel for the 12 wanted wires.

I searched, but could not find anything better than octals with 5 amp x
1,000 volt ratings. 
Standard 5 way 415V ac 3 phase plugs and sockets are just way too
excessively 
large for amplifier connectors. 

The PSU has a 5VA auxiliary PSU within which turns on when the mains
switch at the wall is turned on.
The amps have mains switches that turn 12Vdc only to turn on relays in
the PSU that 
turn on the mains to the large PTs.

The PSU cannot turn on if the active protection circit isn't operational
or someone plugs the wrong plug into the wrong socket, or
plugs only one plug in or none at all.

Diodes prevent high B+ rail voltages appearing on pins of the cable
plugs 
if they are yanked out of the PSU and grabbed.
Under normal operation, rails will fall to safe levels within 10
seconds.

I think my cabling arrangement is as safe as i need it to be and will
survive 
future transfer from one audio enthusiast to another without killing any
of them.

The laws against umbilical cables are due to the woeful attempts at
cabling some manfacturers
have presented to the public.

The slightest fall of PSU off a bench can stretch cables badly, maybe
exposing bare live wires,
so the cables have to withstand such falls.
This means that a cable should preferably become disconnected in a fall
with everything 
turning itself off. 

If any of my customers have a dog capable and interested in chewing nice
thick chewey plastic wires
behind the hi-fi, then one day he may perhaps be persuaded to give up
the habit
when finally, after considerable knawing, a damp tooth hits 600V.

But if he'd started chewing mains cabling, he'd already be wized up
about what wiring tastes like.

Patrick Turner.