UL 746C-2009 pdf download

UL 746C-2009 pdf download.Polymeric Materials – Use in Electrical Equipment Evaluations.
3.29 PORTABLE APPLIANCE – An appliance that is easily carried or conveyed by hand, and is provided with a power-supply cord for connection to the supply circuit. 3.30 POWER-SUPPLY CORD – The flexible electrically insulated cord provided to connect the product to the supply circuit. 3.31 PRIMARY CIRCUITS – The wiring and components that are conductively connected to the supply circuit. 3.32 PRINTED-WIRING BOARD – The finished combination of a pattern of conductive paths either on or within multilayer sheets of insulating material. 3.33 RISK OF ELECTRIC SHOCK – A risk of electric shock is considered to exist at any part if, a) The potential between the part and earth ground or any other accessible part is more than 42.4 V peak, and b) The continuous current flow through a 1 500 ohm resistor connected across the potential exceeds 0.5 mA. 3.34 RISK OF FIRE – A risk of fire is considered to exist at any two points in a circuit where; a) The open circuit voltage is more than 42.4 V peak and the energy available to the circuit under any condition of load including short circuit, results in a current of 8 A or more after 1 minute of operation, or b) A power of more than 1 5 watts can be delivered into an external resistor connected between the two points. 3.35 SAME BASIC COMPOSITION – Materials that are of the identical generic material type having equivalent percentage and type of fillers, additives, resins and reinforcements. 3.36 SECONDARY CIRCUIT – A secondary circuit is a circuit supplied from a secondary winding of an isolating transformer.
3.37 STATIONARY EQUIPMENT – Any equipment or appliance that is intended to be fastened in place
or located in a dedicated space, and is provided with a power-supply cord for connection to the supply
circuit.
3.38 SUPPLY CIRCUIT – The branch circuit supplying electrical energy to the product.
3.39 UNINSULATED LIVE PART – A part involving the risks of fire or electric shock that is bare or has
insulation that is not acceptable for the operating conditions (electrical potential, temperature, and the like) involved.
3.40 USER SERVICING – The replacing, cleaning, or adjusting done by the user.
3.41 VULCANIZED FIBER – A term used in this standard to denote a material normally used as
electrical insulation. Vulcanized fiber is made by combining layers of chemically gelled paper. The zinc chloride used in gelling the paper is subsequently removed by a water leaching treatment, and the resultant product, after being dried and finished by calendering, is a dense material of partially
regenerated cellulose where the fibrous structure is retained in varying degrees, depending upon the grade of fiber.
5 Portable Unattended Household Equipment – Alternate Path 5.1 General 5.1 .1 The basic flammability resistance requirement for polymeric enclosures of portable unattended household equipment is the use of a V-0, V-1 or V-2 rated material, or of a material that complies with the 1 2 mm or 20 mm end-product flame tests as described in Sections 1 5 and 1 6. Alternatively, the use of HB rated materials as the enclosure of portable unattended household equipment is acceptable if the requirements in this section are met. 5.1 .2 In addition to the requirements outlined in Table 4.1 , portable unattended household equipment employing HB rated enclosure material shall comply with the Severe Conditions Test per 28.1 , Mold Stress Relief Distortion Test per Subsection 29.1 (utilizing conditioning guidelines as outlined in Subsection 61 .2) and Input after Mold Stress Relief Test per Subsection 30.1 . 5.1 .3 All electrical connections within the polymeric enclosure of portable unattended household equipment employing HB rated enclosure material shall comply with Subsections 5.2, 5.3 and 5.4. Exception No. 1 : This requirement is not applicable to current-carrying connections that do not involve a risk of fire as defined by 3.34.UL 746C-2009 pdf download.