Re: [PSES] 60601 Electrocardiographs

Hi Matthew, Seem that your interpretation is correct. You need 2-25. 2-27 is for monitoring units. If your device do this (for all biological signals specified in your message) you can use this standard. 2-25 consists on the previous 2-25 + 2-51 (which was for interpretation of ECG). Especially,

Re: [PSES] NFPA Codes, law or not?

When faced with a similar situation a few years ago in a smaller jurisdiction, the local AHJ had us send a formal request to the state fire marshal regarding why interpreting their existing code in light of the latest NFPA version made sense. We did and the state fire marshal blessed it. Mike Sh

Re: [PSES] NFPA Codes, law or not?

I suppose online access by subscription is a viable option but only if the quality and usability is better than the free version. So far, this free version doesn't showcase the product very well. Have a great weekend. ~doug On Fri, Oct 30, 2020 at 2:56 PM Scott Aldous wrote: > Hi Doug, > > The

Re: [PSES] NFPA Codes, law or not?

Hi Doug, The free viewer works great... if your goal is to comply with the letter of the law of providing free access while still attempting to maximize your revenue from sales of the docs. I hadn't heard about no more pdf version available from NFPA. Looks like they have a digital access version

Re: [PSES] NFPA Codes, law or not?

The NFPA is acutely aware of this opinion and considers it an existential crisis. They have been sending out communications for years to their membership making the case that NFPA codes should not be free and the fees paid for them go directly towards improving safety. Just one example: https://

Re: [PSES] NFPA Codes, law or not?

Yes, This "free" version is what I was referring to about being very deficient with regard to usability. The pages cannot be scaled and are in jpg format only. To search for content you can only page through. You can find a table of contents but chapter level is about as granular as it gets. Thes

Re: [PSES] NFPA Codes, law or not?

FYI, the California version of the code is also available to view online for free: https://www.nfpa.org/codes-and-standards/all-codes-and-standards/codes-and-standards/free-access?mode=view There is a California Article 89 which is specific to the state of CA, and various amendments throughout, w

[PSES] 60601 Electrocardiographs

Hello, I am a bit confused about the 60601 particular standard for one of our devices. The previous version of the device had been designed to EC13 back in the stone age and it is being fully redesigned. My confusion is determining which particular is more appropriate, 60601-2-25 or 60601-2-27

Re: [PSES] NFPA Codes, law or not?

Rich, I knew about adoption policies and actually have a web monitor on https://www.nfpa.org/NEC/NEC-adoption-and-use/NEC-adoption-maps so I can capture any updates. I recommend reading the report "Falling behind on electrical safety" . I suppose that when adopted by any locality into law, then

Re: [PSES] NFPA Codes, law or not?

Yes, apparently, the authority to impose an electrical code rests with the individual states (and sometimes individual jurisdictions with a given state). I’m not sure why, but there is probably some constitutional reason why this is controlled by the individual states rather than the Federal go

Re: [PSES] NFPA Codes, law or not?

Hi Doug: If I remember correctly, the intro to the NEC says that it is a model for adoption by various AHJs. In Oregon, each edition of NFPA 70 is formally adopted with exceptions and additions. So, most of NFPA 70 is law. The amendments are freely available. Many other jurisdic

Re: [PSES] Short Circuit Current Rating (SCCR)

The referenced document in SEMI S22 R2-3 "*Example of Point-to-point Short Circuit Current Method*" does not appear to be available on the new Eaton site. But is still available on the Wayback Machine. The document is technically out of date so use it with discretion. The specific paragraph in Semi

Re: [PSES] Short Circuit Current Rating (SCCR)

Lauren & Brian, Be careful with considering a test. The source must have a SSCurrent equal to (or greater than) the largest SCCR component (sounds like the 200kA fuse from your description). This level of available current is not found in your usual lab setup. I have

Re: [PSES] Short Circuit Current Rating (SCCR)

Hi Brian, UL 508A Supplement SB has a method for this. Also the www.semi.org standard SEMI S22 has a method in one of it’s ‘Related Information’ sections. The SEMI standard RI section includes a reprint of an SCCR guide from Bussmann. The link S22 provides no longer works

Re: [PSES] Short Circuit Current Rating (SCCR)

The video gives a good overview, and refers to Supplement SB from UL 508A, which is a good resource. However, these are applicable to industrial control panels. It isn't clear that Brian's equipment would fall into that category. Assuming just industrial control equipment, would a short circuit tes

Re: [PSES] NFPA Codes, law or not?

I agree with Joe. Since jurisdictions across the US do not adopt the same revision of NFPA 70 , mandating a single edition at the federal level could be problematic. On Fri, Oct 30, 2020 at 8:15 AM Joe Randol

Re: [PSES] Short Circuit Current Rating (SCCR)

I did a little hunting for you and found this video that explains the process pretty well: https://youtu.be/v7W0JAp-XBQ -- Doug Nix d...@mac.com +1 (519) 729-5704 "He who closes his ears to the views of others shows little confidence in the integrity of his own views." -- W. Congreve > On 30-

Re: [PSES] Short Circuit Current Rating (SCCR)

Hi Brian, I agree with Doug Powell, but short of doing a complete coordination study, one thing in your message jumped out at me: > "...a 3 phase motor-driven industrial device. It draws less than 8 amps at > 230V. Internal to the device, we have three "CC" type fuses with a SCCR of > 200KA.

Re: [PSES] NFPA Codes, law or not?

Hi Doug: The short answer is that compliance with NFPA 70 is, in fact, the law in most states and localities. Most states have passed laws that require compliance with NFPA 70. In these states, when the electrical inspector visits a site, the code book used to determine compliance wit

Re: [PSES] Short Circuit Current Rating (SCCR)

Brian, The best resource I know is to do an overcurrent protection and coordination study, the same as you might do in the preliminary steps in an arc flash study. Its not dependent on the load as much as the upstream wiring and OCP devices. Unfortunately, you must start at the top, the utility t

[PSES] NFPA Codes, law or not?

My Friday Question, NFPA Codes, law or not? Officially the answer is, "No, these are not laws." I recently saw a clarification stating: "*As a national consensus safety standard, NFPA 70 is not a law and it has not been incorporated into the Code of Federal Regulations. Therefore, compliance is

[PSES] Short Circuit Current Rating (SCCR)

Greetings to all. I hope this finds you well. Once again the subject of SCCR has come up. I have struggled for years to find a document or someone who can explain this to me. The bottom line is I need to know how I would determine the SCCR for my product. In one case in particular I am currentl