75LOKWHT datasheet(6/108 Pages) ETC2

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| General Application Notes |

There are common considerations when using APP® connectors. Additional considerations may apply based on the

particular connector being used, the application, and conditions in which the connector is being used. This information

is intended to provide a basic understanding and is provided for reference only. APP® connectors should be assembled

and used according to the equipment manufacturer’s instructions, as well as in compliance with local and international

electrical codes.

The maximum amperage ratings provided in the specifications are based on use of APP® recommended assembly

tooling and the maximum wire size for the connector being used. Amperage ratings are based on not exceeding the

maximum operating temperature of the connector housing, factoring in an ambient temperature of 25°C or 77°F.

A wire with an appropriate insulation temperature rating should be selected to meet or exceed the total connector

temperature (heat rise + ambient).

As an example: if the maximum operating temperature for a connector operation is 105°C and the ambient temperature

is 25°C, the maximum heat rise attributable to the connector is 105°C - 25°C = 80°C. The expected heat rise based

on the connector and wire size used can be estimated using the heat rise charts, but should be confirmed by testing

in the specific application with the specific wire to be used.

Connector devices are rated or derated by the wiring configuration and the environment. Factors to be considered include:

enclosure characteristics, connector housing and wire insulation characteristics, number of wires in an enclosed area

such as a raceway or conduit, as well as the ambient temperature.

Underwriter Laboratories Inc. amperage ratings are based on not exceeding the maximum operating temperature of

the connector housing. This means connectors can be extremely hot when used at the UL amperage ratings. For this

reason UL amperage ratings should only be applied to connectors when they are used inside an enclosure not accessible

to untrained persons. Canadian Standards Association ratings are based on not exceeding a 30°C temperature rise

above ambient temperatures. For this reason CSA amp ratings are a good point of reference for connectors that are

user operated. APP® does not recommend exceeding a 30°C temperature rise above ambient temperatures for connections

accessible during operation to untrained persons.

| How to Read Temperature Charts |

Tempearture Rise at Constant Current Charts

Temperature Rise at Constant Current charts show the associated heat rise

as a result of applied current to the connector. An example of the SB®50

Temperature Rise chart is included to follow along with this explanation.

The chart is based on an ambient temperature of 25°C (77°F room

temperature). Accordingly if the temperature °C on the Y axis of the chart is at

30°C, the expected total connector temperature would be 55°C.

Separate curves are shown for #6, #8, #10, and #12 AWG wire. Interpreting

the curves, if 50 amps are applied continuously to the connector, the heat rise

will be 23°C for #6, 35°C for #8, 55°C for #10, and #12 wire is not suitable for

this amperage.

Where T = Temperature, heat rise is expressed as a ΔT°C.

T ambient - T (ambient + heat from applied current) = ΔT°C.

0 10 20 30 40 50 60 70 80 90

6 AWG

8 AWG

10 AWG

12 AWG

SB®50

Temperature Rise at Constant Current

Amperes Applied

75LOKWHT 数据表(PDF) 6 Page - List of Unclassifed Manufacturers

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