UL 296:2017 pdf free download – STANDARD FOR SAFETY Oil Burners.
29.6 A safety control shall be supported in such a manner that it and its sensing element will remain in the intended position. It shall be possible to determine by observation or test whether or not each control is in its intended location.
29.7 Nothing shall be provided for the purpose of permitting any safety control to be rendered ineffective or allowing firing of the burner without the protection of each of the required safety controls.
29.8 A burner not equipped to provide automatic restarting shall be arranged to require manual restart after any control functions to cause the fuel supply to be shut off and following restoration of an interrupted power supply.
29.9 A burner shall permit installation with a limit control(s) to restrict excessive pressure or temperature in the appliance being fired.
29.10 The control circuit of a burner intended for use with a limit control which functions to interrupt or reduce the delivery of fuel for combustion by opening an electrical circuit shall be arranged to permit the limit control to be wired into the circuit so as to effect the direct opening of that circuit, whether the switching mechanism is integral with the sensing element or remote from same.
29.11 The purpose of the requirement in 29.10 is to restrict interposing in the limit-control circuit other controls, the failure of which may result in a condition the limit control is intended to restrict. For this purpose, a limit control may interrupt the pilot circuit of a magnetic-type motor controller which, in turn, directly opens the desired circuit when it is necessary to interrupt a single-phase circuit carrying a load greater than the capacity of available limit controls, or to interrupt a multiphase circuit.
29.12 An oil-burner circuit shall be arranged to restrict feedback by a motor, capacitor, or similar device from energizing a fuel valve or ignition device after a control functions to shut off the burner.
29.13 A vaporizing burner shall restrict pooling of the burner upon functioning of the limit control.
30 Primary Safety Controls
30.1 An oil burner shall be equipped by the burner manufacturer with a primary safety control, except as permitted by 8.4.
30.2 A primary safety control shall conform to the requirements of 30.3, 30.4, and Table 30.1.
30.3 A burner having a firing rate of not more than 4 gph (15.1 liters/hr), which upon ignition or flame failure collects or retains within a metal fire pot or receptacle furnished by the manufacturer as part of the burner assembly all of the oil delivered for combustion, may be equipped with an antiflooding device. See Antiflooding Devices, Section 24.
30.4 A primary safety control for a burner, except one equipped as permitted by 30.3, shall be a safety combustion control having nominal safety timings as indicated in Table 30.1.
30.5 A primary safety control shall be constructed and tested in accordance with the Standard for Automatic Electrical Controls for Household and Similar Use – Part 2: Particular Requirements for Burner Ignition Systems and Components, UL 372.
31 General Components and Devices
31.1 Electrical equipment and wiring shall be arranged so that oil will not drip or run on them during intended usage or when a connection must be uncoupled for servicing.
31.2 Attachment plugs or separable connectors shall not be used in circuits when the breaking or making of the circuit by such devices may permit operation of the equipment without all required safety programming.
31.3 Wire connectors shall comply with the Standard for Wire Connectors, UL 486A-486B.
31.4 Thermoplastic wiring material shall comply with the Standard for Thermoplastic-Insulated Wires and Cables, UL 83.