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#76025 28/01/21 2:21 PM
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Neoteny Offline OP
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Good afternoon!

Does anyone use UPS on Stack Systems?

I am in the process of sorting out a setup on 2 Olympus stacks.

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Super Hero
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I have never come across a UPS on a stack (although I can imagine a thoughtfully selected one might look good at the base of the stack - it would certainly add some heft, as well).

Surely (modern) theatres already have "emergency" circuits - and even UPS outlets - already available?

Anyway, the first thing to be considered must be sizing (capacity); how big - in kVA terms - would the UPS need to be?

A good exercise in Cost-Benefit Analysis, no doubt.

Lastly (and off the top of my head), could we be sure that digital equipment (camera, recorder, display etc.) would be tolerant of the less-than-perfect (non-sinusoidal) output from a UPS?

This Olympus .pdf may be useful (no mention of UPS).


If you don't inspect ... don't expect.
Neoteny #76031 29/01/21 11:08 AM
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As the WM series carts are made(?) in the UK by Keymed Ltd in Southend, why not call them for advice.

As Geoff quoted I would have thought that in the patient zone an uninterruptable mains supply would be available
a matter of fact.

Maybe fitting a stabiliser would be more appropriate.

Here in Italy we are using these:

Tripplite

Last edited by Malcolm; 29/01/21 11:08 AM.
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Neoteny Offline OP
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This is for two theatres that do not have backup, and with the current building works they wanted a temporary measure in place IF the power fails.

With covid, everything is closed, so may not actually get to use them.

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Super Hero
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H'mmm ... a special case - a "one off" - then (and hopefully with just a temporary solution required).

If I were you I would pass this one "upstairs" for a decision by the Big Boys. You know, those folk who take the Big Bucks.

Risk Assessment - Cost-Benefit Analysis - expenditure.

Meanwhile, if you have contractors on site, why not seek a solution (quote) from them?

@Malcolm: (voltage) stabilizer? Are the supplies in Roma that poor, then? Otherwise, what purpose do they serve? I saw many (of the older "servo" type) in Foreign Climes, and always considered them a waste of money. When the power failed (as it did at least daily in some places) - then "off" meant "off"!


If you don't inspect ... don't expect.
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Originally Posted by Neoteny
This is for two theatres that do not have backup, and with the current building works they wanted a temporary measure in place IF the power fails.
Even the Nightingale hospitals fully meet the requirements set out in BS 7671 section 710 (IEC 60364-7-710). You can't mitigate away the requirements for the electrical installations in medical locations by "sticking a UPS" onto a medical device!

Also remember you are creating (or modifying) a ME System. This is not just an electrical safety issue (leakage current, EMC, etc.) but a design change. Will the UPS handle the inrush current, can you start up the UPS without a mains input, what happens if the UPS overloads, etc.

My advice, as Geoff said, step away and pass this upwards!

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Alf Offline
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Yes

Good advice from Geoff & MikeX - time to escalate. Its the right thing to do.

Simply request a derogation (an exemption from or relaxation of a rule or law) to facilitate any medical installation falling short of existing requirements.

If you are to proceed, do so only after a risk assessment, UPS are used in conjunction with IPS and then only a correctly rated "medical grade" UPS must be used, please do not use the standard modalities you can obtain from RS etc.

Plenty of advice from specialists out there https://www.upssystems.co.uk/medical-ups

Last edited by Alf; 30/01/21 1:52 PM.

Darren Magee
Head of Medical Physics & Clinical Engineering
AP(D)
Epsom & St Helier University Hospitals NHS Trust
Neoteny #76037 31/01/21 10:03 AM
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You can also find useful information about the electrical supply systems, including UPS, in the UK department of health document HTM 06-01:
https://www.gov.uk/government/publi...-distribution-within-healthcare-premises

MikeX #76038 31/01/21 4:47 PM
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Super Hero
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Yes, HBN 06-01 is a very useful document (if only for its glossary of modern terminology); I believe it should be included - or at least "touched upon" (referred to) - at some stage in every biomed training course (in the UK, at least).

In fact, all of the HTMs are much improved these days.... as indeed are the HBNs.

Lastly, someone (a member of the forum) has asked if I have a copy of the old HTM-8* in .pdf - presumably for "historical research" or some such thing. Sadly, I don't have it (not even in hard copy any more). Can anyone help?

* "Safety Code for Electro-Medical Apparatus" (from the 1960's)


If you don't inspect ... don't expect.

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