How to choose the cable type for electric heater

In actual engineering applications, how to choose the appropriate electric heater cable requires a detailed analysis of the specific situation. Considering both technical and economic factors, the following general principles apply.

First, in oil-gas separation areas, because surface oil pipelines, oil-gas separation buffer tank drainage pipes, natural gas separation equipment, and liquid level gauges are complex and require high temperature control, constant-wattage electric heater cables are generally used. Liquid level gauges typically use single-phase constant-wattage electric heater cables, while other types use three-phase constant-wattage electric heater strips. This allows for unified control using a single explosion-proof distribution box and temperature controller. However, it's important to note that the distribution box, junction box, and temperature controller must meet explosion-proof requirements to prevent any unforeseen events.

If heating a water tank or pipe located far from an explosion-proof area, the heated object is not concentrated, so temperature control requirements are less stringent. Maintaining the temperature within a certain range will meet the required design requirements. In this case, self-controlling electric heater strips are generally chosen, as they eliminate the need for a distribution box and temperature controller, saving significant costs.

If the installation involves numerous curved areas, where cross- or overlapping heater strips may be required, constant-wattage heater strips should be chosen. Self-controlling heater strips are preferred. Constant-wattage heater strips cannot cross or overlap, and they cannot be cut. Self-controlling heater strips, however, can be cut freely, ensuring the integrity of the heater.