How should grounding be handled for multiple RV pad feeds?


The main contribution of this answer is a solution (at the end) that can be used with infinite number of formats, just specifying all "entry" alternative names in the external (global) parameter $postElements and all "published-date" alternative names in the external (global) parameter $pub-dateElements.

Besides this, here is how to specify an XPath expression that selects all /rss//item and all /feed//entry elements.

In the simple case of just two possible document formats this (as proposed by @Josh Davis) Xpath expression correctly works:

/rss//item | /feed//entry

A more general XPath expression allows the selection of the wanted elements from a set of unlimited number of document formats:

/*[contains($topElements, concat('|',name(),'|'))] //*[contains($postElements, concat('|',name(),'|'))]

where the variable $topElements should be substituted by a pipe-delimited string of all possible names for a top element, and $postElements should be...

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If your program runs haywire, you will find that it manages to create about 10,000 window manager objects and then the system won't let it have any more. Why stop at 10,000?

The first answer is "If you have to ask, you're probably doing something wrong." Programs shouldn't be creating anywhere near ten thousands window manager objects in the first place.

Furthermore, as we saw last time, the maximum number of window manager objects that can be created is around 32,700. Giving a program 10,000 is already a third of the total amount available. That's already pretty darned generous, if you ask me. Preventing a program from running away and consuming all of the window manager objects is an attempt to contain the damage caused by a runaway program. Even if a program goes haywire, there's still around 20,000 objects available for the other programs to use. One of them might even be Task Manager, which the user fired up in order to kill the runaway...

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Thank you very much Ryan. I was out of internet connection for several

Now it's much clear that I can output in .ps format or the "image="
option to include external files. I'd prefer not to use ImageMagick
because I want to keep the tool sets involved as minimal as possible.
But thanks for pointing out the external tool I might need to use it in
other command line programs.

> On May 16, 2009, at 08:22, Xuchen Yao wrote:


>> I have two questions regarding multiple trees. Suppose there are two

>> dot files each containing a tree:,


>> What I want to do is:


>> 1. Generate the two trees in one graph


>> I tried: dot -Tpng -o d.png


>> But the tree in is generated. So the question is: how does dot

>> handle multiple inputs?


>> I also searched the mail list a bit, and tried this...

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As you will be displaying various content, if it can all be read by Chrome, a Chromecast would be a great route to go. Each TV having their own Chromecast, and running Chrome with different profiles, each sharing to a different screen.

Another method is what was mentioned, having multiple video cards in a computer and HDMI-ing out to the displays. Depending on the distance, you'll want to use an HDMI -> Ethernet adapter to go the distance, then convert back Ethernet -> HDMI at the display.

The only problem I see then is, how are you going to see what's on the display from the machine? I'd look at getting a Pelco box that combines multiple inputs into a single-display. I'll try to find a link to one I've used in the past.

Basically this is the setup:

Desktop HDMI Out (#1) -> HDMI Cable -> Pelco Box In (#1) -> HDMI / Ethernet Adapter (#1) > Ethernet / HDMI Adapter (#2) -> TV (#1) Input

Desktop HDMI Out (#2) -> HDMI Cable -> Pelco Box In (#2) ->...

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The world of electricity has it's own abbreviations and definitions that are used on components and parts. Below are some of these that might help when you need to replace a bad part.

AC-------- AC is the designator for "Alternating Current" The voltage in your home is AC voltage, and typically, in the US is assumed to be 115VAC. Alternating current reverses polarity and flow alternately in both directions in a circuit.

Amp------ The name Amp is used to designate a measure of electrical current.

Capacitor- A capacitor is an electrical component that can store electrical energy, in other words it has a specific electrical storage capacity. A Capacitor often has a polarity and must be installed properly. The polarity is generally indicated by a stripe at one end of the part.

Circuit Breaker----- A Circuit Breaker is a device that is designed to open up or "throw" itself, when the current through it exceeds it's designed limit. Unlike a fuse, a circuit...

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Re: For safety's sake wouldn't it be better to run a grounding wire to earth"

First, Usually the generator is NOT grounded to the chassis on the 120vac side (it is on the 12 volt side though)

And no, it would not be safer.. In fact it's more dangerous.

here is why...

In the old days tools often had 2-wire plugs, Hot/Neutral if used in a home.. but if the tool, say a Skill hand grinder, developed an intermittent short "hot" to Case, well it could give you a fairly good shock.. Why? Because of history mostly.

Back in the days of world wars, Copper (And even aluminum) were expensive.. So they grounded the low-tension system at the transformer pole.. And ran but a SINGLE 120 volt wire to the house.. They used the earth itself as the return to the transformer.. This saved them 1/2 the cost of the heavy duty drop wire.

Today they still ground at the pole. and at the service entrance to the house.. So neutral and ground are bonded...

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