UL 1673:2011 free download

UL 1673:2011 free download Electric Space Heating Cables
h) Heating panels and panel sets of Article Part lX of the National Electrical Code(NEC),ANSINFPA 70; and
i) Heating cables for installation directly below floor coverings in accordance with 424.99 of theNational Electrical Code (NEC),ANSI/NFPA 70.
1.4 revised October 14,2011
1.5 These requirements do not cover switches, transformers, power supplies, controls (e.g. temperature)or protective devices (e.g. ground fault protection) that are typically installed separate from the spaceheating cable but may be installed at the same time as part of the space heating system. Those devicesare covered by individual requirements that are separate from this Standard.
1.5 revised October 14,2011
2 Components
Section 2 deleted October 14,2011
3 Units of Measurement
3.1 Values stated without parentheses are the requirement. Values in parentheses are explanatory orapproximate information.
4 Glossary
4.1 For the purpose of this standard, the definitions in this Section apply.
4.1.1 COMPONENT – A device or fabricated part of the appliance covered by the scope of a safetystandard dedicated to the purpose.When incorporated in an appliance, equipment otherwise typicallyfield installed (e.g.outlet box) is considered to be a component. Unless otherwise specified, materialsthat compose a device or fabricated part,such as thermoplastic or copper, are not considered
components.
4.1.1 added October 14,2011
4.2 ELECTRICAL CIRCUITS
a)High Voltage Circuit – A circuit involving a potential of not more than 480 V, and havingcircuit characteristics in excess of those of a low voltage circuit.
b) Low Voltage Circuit – A circuit involving a potential of not more than 30 V rms (42.4 V peakor direct-current) and supplied by a primary battery or by a Class 2 transformer, or by a
combination of an isolating transformer and fixed impedance that, as a unit, complies with all ofthe performance requirements for a Class 2 transformer specified in the Standard for Low
Voltage Transformers – Part 1: General Requirements, UL 5085-1 and the Standard for LowVoltage Transformers – Part 3: Class 2 and Class 3 Transformers, UL 5085-3. A circuit derivedfrom a source of supply classified as a line voltage circuit,using impedance in series with thesupply circuit as a means of limiting the voltage and current, is not to be considered a lowvoltage circuit.
4.2revised October 14,2011
4.3 FIELD CONNECTION – Terminals or leads provided for connection of the space heating cable byan electrical installer to the branch circuit supply source.
4.4 HEATING LEAD – That portion of the electric space heating cable that, by means of electrical resistance, is provided for the intent of heating.
4.5 ELECTRIC SPACE HEATING CABLE – An assembly consisting of a heating lead and a nonheating lead or leads intended for installation in the field.
4.6 FREE NONHEATING LEADS – That portion of the factory installed nonheating leads of an electric space heating cable intended for installation in ceilings or within floors that are located behind concealed areas without a supplemental raceway and not embedded within noncombustible materials such as concrete and that are intended to be spliced to electrical power supply leads at a junction box.