NCRR-Series

Supported Applications

The Omega NCRR Series consists of Resistance Heating Ribbon Wire manufactured from Nickel-Chromium Alloy (80% Nickel/20% Chromium). This ribbon wire is utilized in the construction of electrical heating elements. The product overview notes that this specific alloy composition and form factor are proven for outstanding performance over extended periods and represent the same material used in Omega's own electrical heating elements.

Operating Conditions & Performance

The series title specifies a maximum temperature rating of 1400 °F. The ribbon wire is characterized by uniformity of resistance, mechanical stability, and a fine surface finish. Resistance values are provided with a tolerance of ±5%. Current carrying capacity data referenced in the documentation is based on actual tests of single strands of oxidized wire mounted in quiet air and operated at 648°C (1200°F). These tables calculate performance for wire having a resistivity at 648°C (1200°F) with a total surface watts-density of 28 W per square inch.

Resistance Specifications

The series offers specific resistance values in Ω/ft* that vary by model thickness and width. Representative examples from the specification table include:

• Narrow Width (1/64"): Models range from NCRR-1-100 at 22.75 Ω/ft to NCRR-9-100 at 5.51 Ω/ft.
• Moderate Widths: Wider configurations such as the 3/16" width (NCRR-35 through NCRR-39) offer lower resistance values, ranging from 0.88 Ω/ft down to 0.54 Ω/ft.

Configuration Options

The NCRR Series is available in 100' spools (30 m). The series encompasses a broad range of physical dimensions defined by thickness and width combinations, allowing for selection based on specific resistance requirements. All variants follow the model number guide format: NCRR-<Number>-100.

Dimensional Configurations

The series supports multiple cross-sectional profiles:

• Thickness Options: Available in increments including 0.0015", 0.002", 0.0031", 0.0035", 0.004", 0.0045", 0.005", 0.0056", and 0.0063".
• Width Options: Offered in widths of 1/64", 1/32", 1/16", 3/32", 1/8", and 3/16".

Key Product Differences

Variation within the NCRR Series is defined strictly by the combination of ribbon thickness and width, which directly determines the resistance per foot. The model number suffix "-100" indicates a 100-foot spool length for all listed variants.

• High Resistance Models: Thinner ribbons with narrower widths (e.g., NCRR-1-100 at 0.0015" x 1/64") provide higher resistance per foot, suitable for applications requiring lower current draw or specific voltage drops.
• Low Resistance Models: Thicker ribbons with wider widths (e.g., NCRR-39-100 at 0.005" x 3/16") provide significantly lower resistance per foot, accommodating higher current capacities within the documented surface watts-density limits.