UL listing for Surge Protective Device

[Isaiah]

How important is it for a surge protective device for a 480V MCC to be UL listed? What are the consequences if it is not?


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[Dsg319]

N 110.3(C) Listing. Product testing, evaluation, and listing (product certification) shall be performed by recognized qualified electrical testing laboratories and shall be in accordance with applicable product standards recognized as achieving equivalent and effective safety for equipment installed to comply with this Code.

 

[DrSparks]

How important is it for a surge protective device for a 480V MCC to be UL listed? What are the consequences if it is not?


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The consequences are being cited for a code violation?? Does the SPD come with a monetary guarantee?

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[tom baker]

Important for an SPD, where a less expensive design could cause a fire, esp on 480 v
Please see section 242.8 and 10
The UL listing process makes all the mfgs meet min standards.

 

[DrSparks]

Also, is this part a larger assembly with a UL sticker, or is it something you're adding?

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[tom baker]

And the quality listed mfgs have warranties on protected equipment

 

[Isaiah]

Also, is this part a larger assembly with a UL sticker, or is it something you're adding?

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Yes the SPD is installed within a 3P4W 480V MCC that is UL listed. Does this make a difference?


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[Isaiah]

Important for an SPD, where a less expensive design could cause a fire, esp on 480 v
Please see section 242.8 and 10
The UL listing process makes all the mfgs meet min standards.

Thanks Tom.


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[Isaiah]

The consequences are being cited for a code violation?? Does the SPD come with a monetary guarantee?

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Not sure about the guarantee — but will check into. It hasn’t been cited as Code violation but rather as a Client specification violation.


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[don_resqcapt19]

N 110.3(C) Listing. Product testing, evaluation, and listing (product certification) shall be performed by recognized qualified electrical testing laboratories and shall be in accordance with applicable product standards recognized as achieving equivalent and effective safety for equipment installed to comply with this Code.

That does not require anything to be listed. There are a number of places where the code does require products to be listed and those requirements are often found in the xxx.6 sections of the various code articles.
In this case they are required to be listed by the rule in 285.6 (2017 code) but 242.8 in the 2020. Not sure why they did not follow the xxx.6 convention when they created Article 242 for the 2020 code

 

[petersonra]

How important is it for a surge protective device for a 480V MCC to be UL listed? What are the consequences if it is not?


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I can't imagine an MCC manufacturer installing a surge protection device that is not listed. However it is possible that they have some dispensation from UL to install a recognized device, as their UL listing covers the entire assembly as approved by UL.

Did anyone tell The MCC manufacturer about this requirement before it was purchased?

Did this search protection device come with the MCC or did somebody hack it in later?

 

[Isaiah]

I can't imagine an MCC manufacturer installing a surge protection device that is not listed. However it is possible that they have some dispensation from UL to install a recognized device, as their UL listing covers the entire assembly as approved by UL.

Did anyone tell The MCC manufacturer about this requirement before it was purchased?

Did this search protection device come with the MCC or did somebody hack it in later?

Yes they should have known it was a requirement prior to installing the SPD since its part of the Client Specification. As you've stated perhaps they had some dispensation from UL if the entire MCC is assembly is listed, but I will need to scour the specification to see if its allowed.

 

[Jraef]

Yes the SPD is installed within a 3P4W 480V MCC that is UL listed. Does this make a difference?


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Installed by the manufacturer of the MCC? If so, they would need to use an SPD that has been approved in their UL-845 listing to be installed in the MCC; they could not install it otherwise without voiding their UL-845 listing of the unit it is installed in, and thus, per UL-845 rules, if one unit is not listed the entire MCC lineup is not listed.

If YOU are installing an SPD into an MCC after the fact, you are doing the same thing; voiding the UL listing of the MCC. Whether or not that is important to you is not for us to determine.

Among the consequences of that are however;

1. If it has not yet been inspected, and the AHJ is savvy enough to notice the discrepancy, you could get red-tagged.
2. If it was already inspected and approved, or is not going to be inspected, it's up to you. BUT, insurance companies often have riders requiring that all electrical equipment be listed and installed per mfr instructions. So by adding something non-listed and potentially voiding the listing of the MCC, if there were ever a fire with damages for which the user turned into the insurance company, and they investigate the cause and find your modification, you may have given them a way to avoid paying for the damages.