UL 508C section 44 - What does it say? Difference between UL508 and UL508C?

smryan

Perspective.
#1
I've already tried ul.com and find it less than helpful for my question.:frust: Can anyone here tell me the difference between UL508 and UL508C?

I need to know what the test parameters are in section 44 of 508C and all I've been able to find is 508. Are they the same?:confused:

We were told we needed UL810 so that is what we got, but now it seems section 44 of 508 applies and I don't see a way to purchase just the one section. Thanks for any help.
 
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Jim Wynne

Staff member
Admin
#2
Re: UL 508C section 44 - what does it say?

I've already tried ul.com and find it less than helpful for my question.:frust: Can anyone here tell me the difference between UL508 and UL508C?

I need to know what the test parameters are in section 44 of 508C and all I've been able to find is 508. Are they the same?:confused:

We were told we needed UL810 so that is what we got, but now it seems section 44 of 508 applies and I don't see a way to purchase just the one section. Thanks for any help.
Let me Google that for you.

From whence came:
UL 508C
 

smryan

Perspective.
#3
Re: UL 508C section 44 - what does it say?

Thanks.... but I always Google first. If I cannot locate what I need I then start asking people. I don't have $400 to drop on a UL book when all I really need to know is
  • does section 44 apply to us? (all we make is the capacitor - nothing to do with the system it goes in to)
  • and if it does, what testing must we do?
:rolleyes:
 

Marc

Hunkered Down for the Duration with a Mask on...
Staff member
Admin
#4
Is anyone here familiar with UL810 and/or UL508?

Any help would be appreciated!
 

Stijloor

Staff member
Super Moderator
#5
I've already tried ul.com and find it less than helpful for my question.:frust: Can anyone here tell me the difference between UL508 and UL508C?

I need to know what the test parameters are in section 44 of 508C and all I've been able to find is 508. Are they the same?:confused:

We were told we needed UL810 so that is what we got, but now it seems section 44 of 508 applies and I don't see a way to purchase just the one section. Thanks for any help.
You sometimes have to weigh the cost/risk of not knowing vs knowing. It appears that at this time none of our Cove Members have been able to address your issue. Going back to UL may be your only option. Try to get in touch with a specialist there.

Stijloor.
 

smryan

Perspective.
#6
... Going back to UL may be your only option. Try to get in touch with a specialist there.

Stijloor.
Absolutly! You may not be able to read the standards in full, but you CAN get a person on the line. They are amazingly helpful. If anyone ever has UL questions I recommend going the "contact us" form route on their website. You get a call back the next day (maybe even the same day if you start early) from someone who is a specialist in the area of your questioning.:agree1:

As it turns out the 508/C does not apply to us at all but to those who will use our capacitors. 810 is all we need, and even then only part of it applies. Yay!
 

Marc

Hunkered Down for the Duration with a Mask on...
Staff member
Admin
#7
Thanks for getting back to us with what you found out! We appreciate it!
 

Stijloor

Staff member
Super Moderator
#8
Absolutly! You may not be able to read the standards in full, but you CAN get a person on the line. They are amazingly helpful. If anyone ever has UL questions I recommend going the "contact us" form route on their website. You get a call back the next day (maybe even the same day if you start early) from someone who is a specialist in the area of your questioning.:agree1:

As it turns out the 508/C does not apply to us at all but to those who will use our capacitors. 810 is all we need, and even then only part of it applies. Yay!

Glad it worked out for you. Sometimes we don't think about going to the "horse's mouth."

Stijloor.
 
B

Baphom8

#9
I work with motor controllers, so in my world, UL 508 is for Industrial Control Equipmnet, specifically, direct on-line motor starters and reversing motor starters. UL 508C is called Power Conversion Equipmnet, and in my world it realtes to variable speed drives, which are motor controllers that can be used to adjust the speed of a motor. They use PWM or switching power supplies, so the load (as seen from the utility presepctive) varies, and they are very noisy EMC wise.

Section 44? well, lets have a look...thumb....thumb.... Oh! this is one of the friendlier sections. It has to do with dielectric withstand testing. It describes how the equipment must withstand without breakdown for one minute between uninsulated live parts and the case, between isolated secondary circuits and uninsulated live parts and the case, between primary circuit uninsualted live parts and isolated secondary circuit unisulated live parts.

The test potential shall be AC or 1.4.14 times the the follwing values for DC:
for equipment rated not more than 250 volts and intended for use in pollution degree 2 its 1000 volts

for all other equipment 1000 volts plus twice the rated voltage.

Then it goes on to describe the test equipment, it must be 500 volt amperes or larger transformer, has to output a sine wave, has to be adjustable, and has to be able to rise at a uniform rate.

In the past I have used Assoicated Research hypots to do this test, and the UL witness had no issue with the gear. They pop up on E-bay from time to time, and just about anyone can do a calibration on one.

Naturally, I am paraphrasing here, but this is the general feel of the thing.
 
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