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Ask the Engineer - Is branch circuit protection on a 20 amp rated power strip required in North America?

Posted by Bruce Auclair on Nov 29, 2010 8:08:00 AM

Branch circuit protection on a 20A rated power strip is not an National Electrical Code1 (NEC) requirement.  Server Technology has both 20A Inlet rated CDU products with and without branch circuit protection.  The presence of Bussmann SC-20 fuses on 20A units, even though not required, allows for selective coordination with short-circuit faults.  Fuses react fast enough to halt a short-circuit fault nearest the fault while also reducing let-through to upstream and parallel branch gear.

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Topics: PDU, Server Tech

Ask the Engineer - How do I calculate power from 3-phase LED readings?

Posted by Robert Faulkner on Oct 9, 2010 9:29:00 AM

Question from Steven G.: How do I calculate the power usage for devices attached to one of your Smart PDU's by looking at the digital readouts on them? I understand the 3-phase power calculation of P=VA*1.73, but is that done on each leg/phase (x,y,z) for the PDU? An example from a CS-24VY-L30MA is X=4.6, Y=4.6, Z=6.3

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Topics: PDU, smart PDU, 3 phase PDU, How To

Ask the Engineer - Do you have any rack-mount UPS recommendations?

Posted by Robert Faulkner on Oct 4, 2010 1:40:00 PM

On occasion, an installation consists of only a few cabinets and it is desirable to place individual UPS units within each cabinet. Although Server Tech does not provide UPS products and remains manufacturer agnostic, there are a couple things that should be considered from the power distribution point of view.

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Topics: rack mount power distribution units

Ask the Engineer - Automatic reboot when a device fails to respond to a ping request?

Posted by Robert Faulkner on Dec 30, 2009 9:23:00 AM

Question from Carlton <omitted>: I have multiple remote DSL modems that each stop working two to three times a week.  I've deployed 2-outlet Sentry Switched CDU units to allow me to remotely reboot them when they hang, and they work great!  But, I have to wait until someone notifies me of the problem, then I have to manually login to the CDU to initiate the reboot.  I've noticed that the DSL modems fail to respond to ping requests when they hang.  Is there a method available to automatically reboot the DSL modems when they stop responding to ping requests? 

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Topics: data center power, CDU

Ask the Engineer - How much power should I provision for my cabinets?

Posted by Robert Faulkner on Dec 30, 2009 8:57:00 AM

This is a common question I receive: How much power should I provision for my cabinets?

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Topics: data center power

Ask The Engineer - Should Neutral Conductors Be Oversized?

Posted by Robert Faulkner on Dec 16, 2009 12:47:00 PM

Question from Jay <omitted>: I am presently evaluating a CDU model #CS-27VY-L30M and have noticed that the power input cordage does not involve an oversized neutral conductor.  All five conductors are 10-gauge AWG.  Isn't an oversized neutral required to avoid the possibility of overheating the conductor?

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Topics: PDU

3 Phase Power Distribution

Posted by Bruce Auclair on Apr 26, 2007 8:11:00 PM

Lately, we've been getting quite a few questions from customers, channel partners and just about everyone else on 3 phase power. It seems everyone is searching for an effective solution to deliver power to all of the varying devices in their high density cabinets. Rather than trying to re-invent the wheel, we invite you to explore the following resources, all of which we have found to be extremely helpful in discussing 3 phase power with customers.

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Topics: high density cabinets, Power Distribution Unit, 3 Phase power, power distribution

Smart Load Shedding Ensures Uptime

Posted by Bruce Auclair on Feb 15, 2007 9:02:00 AM

Uptime or zero down time is the key driving factor in today’s data center design and operation with companies measuring downtime in thousands of dollars per minute when a system is not available. Many companies operating Tier III and Tier IV data centers also manage remote sites and co-location facilities that are just as critical as their main location. Managing both remote and co-location facilities requires new innovative solutions to ensure uptime. One such solution is using intelligent Cabinet Power Distribution Units (CDU’s) capable of providing Smart Load Shedding capabilities. Smart load shedding allows the operator to load shed based on three key operating parameters; 1) whether the UPS is on battery, 2) the temperature level or 3) the current load. These key parameters allow the user to automatically shed designated, non-critical, devices based on one or all of these conditions ensuring uptime and avoiding damage to the critical devices within the cabinet should a problem occur.

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Topics: CDU, uptime, smart load shedding

Cabinet Level Power Distribution Solutions for High Density Cabinets

Posted by Jenny Durnan Petty on Jan 24, 2007 1:35:00 PM

Of all the issues facing today's data center manager, heat/power distribution top the list. Available uptime and growth constraints round out the top three.

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Topics: data center best practices, data center power, data center issues, uptime, power distribution

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