UL LISTING FOR SWGR?

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Dale001289

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My understanding is that switchgear (and MCC) do not get UL label, but rather the components/devices within the switchgear have to be listed.
Therefore the switchgear is UL Listed?
 
I don't recall NEC Article 408 requiring switchgear or switchboards (or panelboards) to be listed to begin with.

With that in mind, when it is specified as being listed (891 or 1558), the overall assembly gets listed. As part of the assembly listing, many of the components within the assembly are required to be listed, for example an 891 switchboard must use listed breakers (489 or 1077).
 
I believe labeling and listing are used interchangeably.

Stand alone products, like those with conduit entries, are Listed
Components, which must be used with other components, are Recognized.
 
ron said:
I don't recall NEC Article 408 requiring switchgear or switchboards (or panelboards) to be listed to begin with.

With that in mind, when it is specified as being listed (891 or 1558), the overall assembly gets listed. As part of the assembly listing, many of the components within the assembly are required to be listed, for example an 891 switchboard must use listed breakers (489 or 1077).
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I think if they didn't need to be listed we wouldn't have the issues of what breaker can you use in what panel that comes up from time to time.
 
jim dungar said:
I believe labeling and listing are used interchangeably.

Stand alone products, like those with conduit entries, are Listed
Components, which must be used with other components, are Recognized.
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And in a switchboard or MCC you may have recognized as well as listed components within, but the entire assembly usually has a listing as well

MCC you very well might have same motor contactor/overload assembly that is installed in stand alone enclosures. But might have a recognized motor protector (mag trip breaker only) instead of a listed thermal-mag breaker.
 
UL-listed low voltage switchboards and switchgear is available. UL-listed MCCs are certainly available. In many jurisdiction, if a class of equipment is offered by even one manufacturer with a NRTL label, then it must be provided. Oregon is notorious about this.
 
Don't forget EUSERC

Electric Utility Service Equipment Requirements Committee (EUSERC) was formed in 1983 when the Southern California group PUSERC (formed in 1947) and the Northern California group WUESSC (formed in 1950) merged. At this time there were approximately 40 utilities involved. There are now 80 utilities involved in EUSERC from 14 states. The purpose of the organization is to promote uniform electric service requirements among the member utilities, publish existing utility service requirements for electric service equipment and provide direction for development of future metering technology. EUSERC's goal is to support the development of metering and service equipment that is safe and cost effective to the serving agencies and their customers, and to establish manufacturing and installation requirements for metering and service equipment that are acceptable to all member utilities.
 
ron said:
Hard to imagine since there is electrical equipment that do not have a listing associated to be tested to.
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That doesn't stop them from stamping it on the plans. :unsure:
 
ron said:
I don't recall NEC Article 408 requiring switchgear or switchboards (or panelboards) to be listed to begin with.

With that in mind, when it is specified as being listed (891 or 1558), the overall assembly gets listed. As part of the assembly listing, many of the components within the assembly are required to be listed, for example an 891 switchboard must use listed breakers (489 or 1077).
Click to expand...
Slight corrections;
ALL components in the gear must be listed or Recognized Components (UR)

UL-1077 is not valid for use as branch or feeder breakers, only as “supplemental protectors”. So the only way they could be used in switchgear or panelboards would be downstream of another branch breaker to provide lower levels of load protection than that branch breaker does. So for example, you have a 15A branch breaker for controls, but a device in the circuit that needs protection at 5A, you can add a 5A 1077 listed supplementary protector downstream of the branch OCPD.
 
Dale001289 said:
My understanding is that switchgear (and MCC) do not get UL label, but rather the components/devices within the switchgear have to be listed.
Therefore the switchgear is UL Listed?
Click to expand...
Whomever told you that is woefully uninformed…

UL-891 is for switchboards.
UL-1558 is for switchgear.
UL-67 is for panelboards.
UL-845 is for LV MCCs.
UL-347 is for MV MCCs.
 
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