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“K(i) Rated” Medical-Grade Power Protection

by Suzanne Hooley

General Power Quality, Medical Power Quality

What’s A “K(i)” Rating, And Why Is It Important To My Modality?

A “K(i)” rating refers to the intermittent kVA or “momentary power demand” rating.   During the time that a medical imaging or treatment modality (e.g. MRI, CT, linear accelerator, gamma knife, etc) performs the actual scan or procedure, that piece of equipment has a high surge current — meaning that the current will rise to (or be higher than!) 3 to 5 times that of the steady state current.

This momentary power demand typically lasts for < 5 seconds, however these seconds are “critical” in that the power source must deliver the required current while staying within the line voltage tolerance of the imaging / treatment equipment.

So Oversizing Should Solve Everything … Right?

No … it won’t!   We’ve seen how some medical OEM’s and power quality manufacturers take a “better safe than sorry” approach, and deliberately oversize the distribution transformer, power conditioner, or voltage regulator, treating the momentary power demand as if it was a continuous event.

However, keep in mind that most of the time, the imaging / treatment equipment is in the standby mode and requires only a fraction of its momentary power demand.   Therefore, the “oversizing” approach simply leads to an expensive and inefficient installation … yielding increased operating costs, and often requiring a larger space than necessary to accommodate the oversized transformer or power conditioner.

A Better Approach:   Controlled Power Company’s Solution!

Our K(i) rated  SureImage power conditioner  or  SureImage voltage regulator  is installed “upstream” from the medical imaging / treatment modality.

Our solution:   When sizing our product, we consider both the maximum intermittent and the maximum steady state kVA ratings of the modality.

  1. We size our SureImage product’s K(i) rating to be greater than the modality’s maximum intermittent kVA rating.
  2. Likewise, we size our SureImage product’s continuous kVA rating to be greater than the modality’s maximum steady state kVA.

Our SureImage medical-grade, K(i) rated power conditioners and voltage regulators are designed to supply both the intermittent and continuous kVA, while continuing to provide tightly-regulated voltage.

A K(i) rating refers to the intermittent kVA or "momentary power demand" rating.   When medical grade power equipment operates, it has a high surge current.
SureImage “Model Ultra-K/M” (left) and “Model 700F/M” (right)

So What Does This Mean For You?

Bottom line:   Our SureImage products are  properly-sized for the continuous load rating; and provide regulated and conditioned power, high efficiency, and lower operating costs.

In addition, all of our SureImage models are  surge-rated to optimize performance; and provide your medical modality with exactly the power that it needs!

Contact us for more details!   Let us know how we can help you!

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2 Responses to ““K(i) Rated” Medical-Grade Power Protection”

January 06, 2015 at 4:22 pm, Mario j Mirabal/BISNES S.A. said:

OK, certainly we need your cooperation refer the selection of our UPS to protect an MRI …
Please reply with your comments about it.
Kind regards.
Mario j Mirabal/BISNES S.A.


January 06, 2015 at 4:48 pm, Suzanne Hooley said:

Hello Mario, thank you for your request for information and a quotation! We also received the RFQ and “Contact Us” forms that you submitted from our website … thank you! Your requests have been given to our Latin American sales team, and either they or our manufacturer’s rep agency will be working directly with you to provide you with the information and the quote that you need! Again thank you for contacting us for your electrical power solutions! Best regards, Suzanne Hooley (Marketing Director)


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