How far can the KPA1500 amp be from the PS?

I would revisit running a 240 outlet into the shack. You would need very
large conductors to have the power supply that far away and laying these
wires on the floor would certainly not be aesthetically pleasing.  It is
sometimes a bit of work and may require some drywall repair however I cannot
imagine a situation were running another electrical circuit is not possible.
How do you get all of the other cables into your shack? Find a different
electrician. MY Aruba home had solid concrete walls and I added a 240v
outlet.

John KK9A


[Elecraft] How far can the KPA1500 amp be from the PS?
Dauer, Edward edauer at law.du.edu

The KPA1500 Manual states that "the power supply can be operated remotely"
and that the supplied cables are 66 inches long.  It does not say how far
apart, beyond the 66 inches, the PS and the amp can be without affecting
performance or creating other issues.  

Does anyone know?  There are apparently three cables - the main HV, the
15-pin control, and the 12VDC phono plug cable for remote turn-on of the
amp.

I am thinking about buying a KPA1500 but may have trouble bringing 220 VAC
into the shack.  One electrician I hired long ago to look at the question
told me it could not be done in an aesthetically acceptable way given the
nature of the construction of the basement walls where the station is.
That's why I bought the KPA500 rather than a KW amp at the time. There is a
220 VAC outlet in another room on another floor of the house, which might
allow me to lay some long cables while I am trying to figure out how to get
220 into the shack.  It is used to power the cook-top so the current
capacity is likely sufficient - which I check by looking at the breakers.

The tripping hazard of doing this might itself be unacceptable, but I'd like
to think about it.  The other possibility would be using a 220 VAC extension
cord and locating the PS in the shack itself, but that seems even more
dangerous . . .

Thoughts, anyone?

Thanks, as always,

Ted, KN1CBR  

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[Clay Autery-2]

I concur...  Should have replied to the original post.  Sorry.

OK...  you NEED 240 in the shack, so if you are going to do it... and
you should, do it right.

Put a sub-panel in the basement and take at least a 60, preferably an
80+ Amp line from the main box to the sub-panel.  Then hack out 120 and
240 circuits as required...  I have 240 x 15 and 20 Amp duplexes and 4 x
120 x 20 Amp duplexes to make danged sure I will never have to address
power issues again.

The 240 comes from the main box in a 4-wire, 2 sizes bigger copper than
required, so I can boost the power at the mains later if need be by
swapping breaker set without busting code.  The 2 x 120 legs are twisted
pair, and the ground and neutral wires are twisted pairs.  Both pairs
are run in steel flex conduit from mains to sub.  From sub to duplexes
are also run in steel flex.  ALL duplexes are mounted in metal
boxes....  From the metal boxes back to the main panel box is ONE
CONTINUOUS electrical connection with very, very low resistance, and of
course the main breaker box is grounded as per code.

I never even think about if my power is the issue now...


On 04/28/18 09:52, [hidden email] wrote:

> I would revisit running a 240 outlet into the shack. You would need very
> large conductors to have the power supply that far away and laying these
> wires on the floor would certainly not be aesthetically pleasing.  It is
> sometimes a bit of work and may require some drywall repair however I cannot
> imagine a situation were running another electrical circuit is not possible.
> How do you get all of the other cables into your shack? Find a different
> electrician. MY Aruba home had solid concrete walls and I added a 240v
> outlet.
>
> John KK9A
>
>
> [Elecraft] How far can the KPA1500 amp be from the PS?
> Dauer, Edward edauer at law.du.edu
>
> The KPA1500 Manual states that "the power supply can be operated remotely"
> and that the supplied cables are 66 inches long.  It does not say how far
> apart, beyond the 66 inches, the PS and the amp can be without affecting
> performance or creating other issues.
>
> Does anyone know?  There are apparently three cables - the main HV, the
> 15-pin control, and the 12VDC phono plug cable for remote turn-on of the
> amp.
>
> I am thinking about buying a KPA1500 but may have trouble bringing 220 VAC
> into the shack.  One electrician I hired long ago to look at the question
> told me it could not be done in an aesthetically acceptable way given the
> nature of the construction of the basement walls where the station is.
> That's why I bought the KPA500 rather than a KW amp at the time. There is a
> 220 VAC outlet in another room on another floor of the house, which might
> allow me to lay some long cables while I am trying to figure out how to get
> 220 into the shack.  It is used to power the cook-top so the current
> capacity is likely sufficient - which I check by looking at the breakers.
>
> The tripping hazard of doing this might itself be unacceptable, but I'd like
> to think about it.  The other possibility would be using a 220 VAC extension
> cord and locating the PS in the shack itself, but that seems even more
> dangerous . . .
>
> Thoughts, anyone?
>
> Thanks, as always,
>
> Ted, KN1CBR
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

______________________________________________________________
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