Safety certifications

[CandL]

I tried looking for this but could not find any references... even Masso AI failed me.

Are there any safety certifications on Masso products. Here in the US we have Underwriters Labs (UL) that basically says product "A" should not burn down your house/business.

I do see a UL listing on: "Power Supply 36VDC, 9.7A" ...it also has a bunch more listings which is all good.

Am I just missing the references?

 

[Espressomatic]

Besides any mains-connected power supplies offered, nothing else is subject to UL, CSA or other approvals. FCC Class B maybe for the US for the controller/display.

Not sure what you're missing, but it's something.

 

[zombieengineer]

Providing @CandL is in the US then NFPA 79 applies for an industrial machinery that is below 600V AC that is not "Extra Low Voltage". He is quite correct to literally state "Product 'A' should not burn down your house/business" as NFPA is the National Fire Protection Association.

The definition for Extra Low Voltage under the NFPA 79 is:

• Less than 30V AC (RMS) for dry conditions
• Less than 60V DC (ripple free) for dry conditions
• Less than 6V AC (RMS) for other conditions
• Less than 15V DC (ripple free) for other conditions

Providing your system is within the definition of Extra Low Voltage then NFPA 79 compliance is not required.

I did write a basic FAQ on NFPA 79 more as a "here is where to look" for people in North America building a CNC system (not intended to be an authoritative reference):

https://forums.masso.com.au/threads/usa-wiring-standards-nfpa-79.3272/

 

[CandL]

I am the retired Mech E, but my wife is the retired EE.... She used to do shop floor installs so worked on many "Industrial Control Panels". So as I was buying gear she started asking these questions .... being the knuckle dragging ME I came here.

Mr ZombieEngineer your little FAQ is exactly what I was looking for. Now to read it.

Thanks
Carl

 

[Espressomatic]

The Masso controller is extra low voltage. The only part on the site being sold that actually PRODUCES voltage, the power supply, has all the required certifications to be sold pretty much globally. And you don't have to buy it, being free to use pretty much any off the shelf 24vDC supply. But judging by the replies, I think some people would probably prefer to create their own switch mode supplies from scratch.

 

[zombieengineer]

@Espressomatic - Given that CandL's wife was a formerly practising engineer who built industrial control enclosures, she will have some fairly firm ideas of what needs to be done (it almost becomes reflex). What CandL needed is enough information to be able to "speak the same language" when discussing wiring of industrial control enclosures, understand what is important and what information is noise.

My bullet point summary of stuff to consider for an NFPA79 industrial control enclosure:

• An industrial control enclosure is a mini electrical switch board
• Enclosure needs to have an appropriate UL rating
• Enclosure needs an appropriately rated "Supply Circuit Disconnect" switch
  • Read NFPA 79 for details as there are requirements beyond electrical
  • Supply Circuit Disconnect switch should be "near as practical to the top of the enclosure"
• Best practices is for decreasing voltages going down the enclosure
• All mains wiring should be rated for >125% of Full Load Amps (FLA)
  • NFPA 79 specifies 14 AWG or larger conductor for power circuits (16 AWG exception available for multi-conductor)
• All loads shall have an appropriate over-current protection having a rating no more than 125% of Full Load Amps
  • Specifically applies for motors, other loads may have different requirements
  • There are two types of UL rated circuit breakers, use the correct one for the task (if using circuit breaker for over-current protection)
  • Adjustable motor over-current devices are often paired with other devices (disconnect switch, contactor relay) and the UL rating is for specific combinations of devices
• Manufacturer's requirement for equipment spacing shall be followed
• Capture in a document the Full Load Amps for each of the loads and equipment spacing
• NFPA 79 has wiring color requirements

There is a fair amount to consider just wiring the terminals together...