100 Overcurrent Protective Device, Branch-Circuit.

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Section/Paragraph: 100 Overcurrent Protective Device, Branch-Circuit.

Deleted Text

Overcurrent Protective Device, Branch-Circuit. A device capable of providing protection for service, feeder, and branch circuits and equipment over the full range of overcurrents between its rated current and its interrupting rating. Such devices are provided with interrupting ratings appropriate for the intended use but no less than 5000 amperes.

Substantiation:

The title includes "Branch-Circuit" but the definition includes service and feeder.

 

[GoldDigger]

I see a possible need to distinguish between breakers which are rated only for mains or feeders but not for branch circuits from those that are ALSO allowed to be used for branch circuits. There may be a different UL classification standard involved.
I do know that there is a separate UL standard for supplemental OCPD.

Tapatalk!

 

[fmtjfw]

I see a possible need to distinguish between breakers which are rated only for mains or feeders but not for branch circuits from those that are ALSO allowed to be used for branch circuits. There may be a different UL classification standard involved.
I do know that there is a separate UL standard for supplemental OCPD.

Tapatalk!

The UL White Book (available as a free PDF from their site) classifies the 600V and below circuit breakers used in the majority of services and subpanels as "CIRCUIT BREAKERS, MOLDED CASE AND CIRCUIT-BREAKER ENCLOSURES (DIVQ)" No distinction is made for main, feeder or branch circuit protecting CBs.

The other (600V) classifications are:
CIRCUIT BREAKERS (DHJR) [general]
ADAPTERS, CIRCUIT BREAKER (DHWZ)
CIRCUIT-BREAKER ACCESSORIES (DIHS)
CIRCUIT BREAKERS AND SURGE-PROTECTIVE DEVICES (DIMV)
CIRCUIT-BREAKER CURRENT LIMITERS (DIRW)
CIRCUIT BREAKERS FOR USE IN COMMUNICATIONS EQUIPMENT (DITT)
Circuit-breaker Accessories for use in Communications Equipment (DITX)
CIRCUIT BREAKERS, MOLDED CASE AND CIRCUIT-BREAKER ENCLOSURES FOR USE IN PHOTOVOLTAIC SYSTEMS (DIUR)
CIRCUIT BREAKERS, MOLDED CASE, CLASSIFIED FOR USE IN SPECIFIC EQUIPMENT (DIXF)
CIRCUIT BREAKERS WITH EQUIPMENT GROUND-FAULT PROTECTION (DIYA)
FUSED CIRCUIT BREAKERS (DIYV)
CIRCUIT BREAKER AND GROUND-FAULT CIRCUIT INTERRUPTERS (DKUY)
CIRCUIT BREAKERS FOR USE IN HAZARDOUS LOCATIONS (DKAR)
BRANCH CIRCUIT AND SERVICE CIRCUIT CIRCUIT BREAKERS FOR USE IN HAZARDOUS LOCATIONS (DKNZ)
BRANCH CIRCUIT AND SERVICE CIRCUIT CIRCUIT BREAKERS FOR USE IN ZONE CLASSIFIED HAZARDOUS LOCATIONS (DKPN)

The supplemental classifications appear to be only for fuses.

 

[jim dungar]

The supplemental classifications appear to be only for fuses.

UL489 is for general molded case circuit breakers. This is what we use use to meet most NEC requirements.
UL1077 is for supplemental circuit breakers. These are primarily used internal to equipment that may itself be UL 'listable', like control panels.

 

[don_resqcapt19]

Based on the definition, the breaker used as a service disconnect is not an overcurrent protective device as that device can only provide overload protection for the service conductors. It can't provide short circuit and ground fault protection for the service conductors.

The words "branch circuit" need to be removed from the title and the word "service" needs to be removed from the actual definition.