[PSES] Cable current clamp with 4-20mA output

I’m looking for a low cost cable current clamp for 50/60Hz current measurements and with 4-20mA output. Snap-on mechanism is a must. It should be a really «low cost» device, since the numbers of clamps in a large building can be 10++, maybe 100. Any recommendations? Best regards Amund

Re: [PSES] Pilot rating

Gerry, I had the same impression. John Shinn, PPASEL Sent from my iPhone > On Dec 7, 2017, at 1:31 PM, Ghery Pettit wrote: > > I looked at the subject line and thought about something completely unrelated > – pilot ratings. I have a PP-ASEL IA. Private Pilot – Airplane, Single > Engine, La

Re: [PSES] Fwd: [PSES] Was there ever a comparison between IEC 60950-1 and IEC 62368-1 (current edition preferable)? And any rationale for any of the changes

Leo, They should make you the convenor of the group to harmonize upgrading the requirements between 60601 and 62368 since you know how to get input in a hurry. :>) :>) br, Pete Peter E Perkins, PE Principal Product Safety & Regulatory Affairs Consultant PO

Re: [PSES] Pilot rating

Dave, et al, Being able to argue the imposition of requirements requires several things. The requirements should be soundly technically based, cynical Rich already addressed one case showing deficiencies. Since the application description doesn’t seem to cover the situation

Re: [PSES] Pilot rating

Interesting. The test engineer at the NRTL (not UL) I always work with always says we (the lab and the client) must always apply sound engineering judgment when applying standards when something isn’t completely clear or straightforward in the standard. And this lab is always making sure their

Re: [PSES] Pilot rating

According to https://www.macromatic.com/blog/relays/what-are-pilot-duty-ratings-and-which-macromatic-products-have-them “A pilot duty rating is a contact rating intended for contacts that control the coil of another relay or contactor. These ratings are applicable when controlling loads

Re: [PSES] Pilot rating

This is, I think, an informed source and it defines “pilot duty” https://na.industrial.panasonic.com/blog/what-pilot-duty-rating-how-it-obtained By the way, if you are driving your relay coil with a small mosfet, many of those have an "avalanche rating" and can safely absorb (dissipate) the ener

Re: [PSES] Pilot rating

I only pilot paper airplanes and this isn't my area of expertise, but it looks like this potential requirement originates in NEMA ICS 5 "Industrial Control and Systems: Control Circuit and Pilot Devices" and perhaps also in IEC 62314 (Solid State Relays - as a "control" relay though the word 'pilo

Re: [PSES] Pilot rating

I'm sure that in the past they have been privately amused at what some people have submitted for certification.  I recall that SEMKO were entertained by a TV set from another, nameless country, back in the 1970s, and if you can make a Swede laugh, you have won a major prize. John Woodgate OOO-

Re: [PSES] Pilot rating

UL, AND every other certification body – especially if there is “money” in it L From: Kunde, Brian [mailto:brian_ku...@lecotc.com] Sent: 07 December 2017 21:48 To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Pilot rating UL does not have a sense of humor that we are aware of. TOB

Re: [PSES] Pilot rating

A web search for 'OPTOMOS pilot duty rating' produces useful information, including references to UL508. But it seems that these are contact ratings for switching inductive loads (other relay coils). Since you have the double zener to absorb the inductive kick, you would only need, it seems, th

Re: [PSES] Pilot rating

UL does not have a sense of humor that we are aware of. TOB From: Jon Keeble [mailto:j...@wattwatchers.com.au] Sent: Thursday, December 07, 2017 4:45 PM To: EMC-PSTC@LISTSERV.IEEE.ORG Subject: Re: [PSES] Pilot rating We are getting a somewhat innovative product through UL at the moment. So there

Re: [PSES] Pilot rating

We are getting a somewhat innovative product through UL at the moment. So there has been quite a lot of discussion and feedback from UL. But when UL said they thought my little board needed a pilot rating I really thought they were joking. Jon Keeble On Fri, Dec 8, 2017 at 8:31 AM, wrote: > I l

Re: [PSES] Pilot rating

I looked at the subject line and thought about something completely unrelated – pilot ratings. I have a PP-ASEL IA. Private Pilot – Airplane, Single Engine, Land Instrument Airplane. 😊 And you? Ghery S. Pettit From: Jon Keeble [mailto:j...@wattwatchers.com.au] Sent: Thursday, Decemb

[PSES] Pilot rating

I am using a Panasonic AQH3213A PhotoMOS optical isolator to control a small contactor. At 110VAC the contactor coil draws 30mArms. The coil contacts are wired to a PCB via a terminal block plug and socket. On the PCB is a series 10ohm fusible resistor, and a SMBJ400AC bidirectional zener. When

[PSES] Fwd: [PSES] Was there ever a comparison between IEC 60950-1 and IEC 62368-1 (current edition preferable)? And any rationale for any of the changes

It seems like my e-mail response got bounced so I am sending again. Apologies if a duplicate. > > Thx to all your feedback and I clearly get the point these are very different > standards but changing from using bits and pieces of IEC 60950-1 to IEC > 62368-1 in our draft IEC 60601-1, 3rd ed.

[PSES] Rationale for product safety standards

Rationale can be both good and bad. For example, 108-678eDC says: “Misuse depends on personal objectives… and the possible use of the equipment… to accomplish those personal objectives.” On the other hand, the document further states that: “… the requirements of the standard cover