Industrial ovens - continuous vs. non-continuous

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winslowfam

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Hi...we are doing a load calculation for a client who is installing industrial ovens that heat up a product in a vessel and then maintain a temperature for a period of time. Article 427.4 states that all fixed electric heating equipment for pipelines or vessels shall be considered continuous load. Is this just for heat trace-type systems? Our client's ovens do not take 4 hours to heat up and then cycle to maintain temp, so I thought we could consider them non-continuous loads since they would never run continuously for > 4 hours at any one time. thanks.
 
winslowfam said:
Hi...we are doing a load calculation for a client who is installing industrial ovens that heat up a product in a vessel and then maintain a temperature for a period of time. Article 427.4 states that all fixed electric heating equipment for pipelines or vessels shall be considered continuous load. Is this just for heat trace-type systems? Our client's ovens do not take 4 hours to heat up and then cycle to maintain temp, so I thought we could consider them non-continuous loads since they would never run continuously for > 4 hours at any one time. thanks.
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I do not have a clue about 427, but continuous is 3 hours.

Continuous Load. A load where the maximum current is
expected to continue for 3 hours or more.
 
these has hoppers that need to be kept hot to allow the product to flow. There are heaters attached to the hoppers.
 
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