Chapter 296-307 Safety standards for agriculture.

Outlet devices must have an ampere rating at least equal to the load served.[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 20-21-091, § 296-307-36606, filed 10/20/20, effective 11/20/20. WSR 97-09-013, recodified as § 296-307-36606, filed 4/7/97, ef…

This section applies to branch circuit, feeder, and service conductors rated 600 volts, nominal, or less and run outdoors as open conductors.(1) Conductors supported on poles must provide a horizontal climbing space of at least the following:(a) For power conductors below communi…

(1) Disconnecting means for service-entrances must meet the following requirements:(a) Means must be provided to disconnect all conductors in a building or other structure from the service-entrance conductors. The disconnecting means must plainly indicate whether it is in the ope…

(1) The following requirements apply to overcurrent protection of circuits rated 600 volts, nominal, or less.(a) Conductors and equipment must be protected from overcurrent according to their ability to safely conduct current.(b) Except for motor running overload protection, over…

The following systems that supply premises wiring must be grounded:(1) All 3-wire DC systems must have their neutral conductor grounded.(2) Two-wire DC systems operating at 50-300 volts between conductors must be grounded.Exception:This requirement does not apply if: 1. They supp…

For AC premises wiring systems the identified conductor must be grounded.[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 20-21-091, § 296-307-36621, filed 10/20/20, effective 11/20/20. WSR 97-09-013, recodified as § 296-307-36621, filed 4/7/97, effec…

(1) For a grounded system, a grounding electrode conductor must be used to connect both the equipment grounding conductor and the grounded circuit conductor to the grounding electrode. Both the equipment grounding conductor and the grounding electrode conductor must be connected …

The path to ground from circuits, equipment, and enclosures must be permanent and continuous.[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 20-21-091, § 296-307-36627, filed 10/20/20, effective 11/20/20. WSR 97-09-013, recodified as § 296-307-36627,…

(1) Metal cable trays, metal raceways, and metal enclosures for conductors must be grounded.Exceptions:1. Metal enclosures such as sleeves that are used to protect cable assemblies from physical damage need not be grounded; or 2. Metal enclosures for conductors added to existing …

(1) Noncurrent-carrying metal parts of fixed equipment, if required to be grounded by this section, must be grounded by an equipment grounding conductor that is contained within the same raceway, cable, or cord, or runs with or encloses the circuit conductors. For DC circuits onl…

Grounded high voltage (1000 volts or more) systems and circuits must meet all requirements of WAC 296-307-366 and the additional requirements of this section.(1) Systems supplying portable or mobile high voltage equipment, other than substations installed on a temporary basis, mu…

[WSR 97-09-013, recodified as § 296-307-368, filed 4/7/97, effective 4/7/97. Statutory Authority: RCW 49.17.040, [49.17.]050 and [49.17.]060. WSR 96-22-048, § 296-306A-368, filed 10/31/96, effective 12/1/96.]

WAC 296-307-368 does not apply to conductors that are an integral part of factory-assembled equipment.[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 20-21-091, § 296-307-36803, filed 10/20/20, effective 11/20/20. Statutory Authority: RCW 49.17.040. …

Temporary electrical power and lighting wiring methods may be of a class less than would be required for a permanent installation. All requirements for permanent wiring apply to temporary wiring installations, except as indicated in this section.(1) Temporary electrical power and…

(1) Only the following may be installed in cable tray systems:(a) Mineral-insulated metal-sheathed cable (Type MI);(b) Armored cable (Type AC);(c) Metal-clad cable (Type MC);(d) Power-limited tray cable (Type PLTC);(e) Nonmetallic-sheathed cable (Type NM or NMC);(f) Shielded nonm…

(1) Open wiring on insulators is only permitted on systems of 600 volts, nominal, or less for industrial or agricultural establishments and for services.(2) Conductors must be rigidly supported on noncombustible, nonabsorbent insulating materials and must not contact any other ob…

(1) Conductors entering boxes, cabinets, or fittings must be protected from abrasion, and openings through which conductors enter must be closed. Unused openings in cabinets, boxes, and fittings must also be closed.(2) All pull boxes, junction boxes, and fittings must have covers…

(1) Single-throw knife switches must be connected so that the blades are dead when the switch is in the open position. Single-throw knife switches must be placed so that gravity will not tend to close them. Single-throw knife switches approved for use in the inverted position mus…

Switchboards that have any exposed live parts must be located in permanently dry locations and accessible only to qualified persons. Panelboards must be mounted in cabinets, cutout boxes, or enclosures approved for the purpose and must be dead front. However, panelboards other th…

All conductors used for general wiring must be insulated unless otherwise permitted in this section. The conductor insulation must be approved for the voltage, operating temperature, and location of use. Insulated conductors must be distinguishable by appropriate color or other m…

(1) Flexible cords and cables must be approved and suitable for conditions of use and location. Flexible cords and cables must be used only for:(a) Pendants;(b) Wiring of fixtures;(c) Connection of portable lamps or appliances;(d) Elevator cables;(e) Wiring of cranes and hoists;(…

(1) A conductor of a flexible cord or cable that is used as a grounded conductor or an equipment grounding conductor must be distinguishable from other conductors. Types SJ, SJO, SJT, SJTO, S, SO, ST, and STO must be durably marked on the surface with the type designation, size, …

Multiconductor portable cable for use in supplying power to portable or mobile equipment at over 600 volts, nominal, must consist of No. 8 or larger conductors employing flexible stranding. Cables operated at over 2,000 volts must be shielded to confine the voltage stresses to th…

(1) A fixture wire must be approved for the voltage, temperature, and location of use. A fixture wire used as a grounded conductor must be identified.(2) Fixture wires may be used:(a) For installation in lighting fixtures and in similar equipment where enclosed or protected and n…

(1) Fixtures, lampholders, lamps, rosettes, and receptacles must have no live parts normally exposed to employee contact. However, rosettes and cleat-type lampholders and receptacles located at least 8 feet above the floor may have exposed parts.(2) Handlamps of the portable type…

(1) Receptacles, cord connectors, and attachment plugs must be constructed so that no receptacle or cord connector will accept an attachment plug with a different voltage or current rating than that for which the device is intended. However, a 20-ampere T-slot receptacle or cord …

(1) Appliances, other than those in which the current-carrying parts at high temperatures are necessarily exposed, must have no live parts normally exposed to employee contact.(2) Each appliance must have a disconnecting means.(3) Each appliance must be marked with its rating in …

(1) If specified that one piece of equipment must be "in sight from" another piece of equipment, one must be visible and not more than 50 feet from the other.(2) Disconnecting means must meet the following requirements:(a) A disconnecting means must be located in sight from the c…

(1) This section applies to the installation of all transformers.Exceptions:1. Current transformers; 2. Dry-type transformers installed as a component part of other apparatus; 3. Transformers that are an integral part of a high frequency or electrostatic-coating apparatus; 4. Tra…

(1) All capacitors, except surge capacitors or capacitors included as a component part of other apparatus, must have an automatic means of draining the stored charge after the capacitor is disconnected from its source of supply.(2) Capacitors rated over 600 volts, nominal, must m…

The employer must ensure that there is sufficient diffusion and ventilation of gases from storage batteries to prevent the accumulation of explosive mixtures.[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 20-21-091, § 296-307-36857, filed 10/20/20, …

(1) Metal raceways, cable armor, and other metal enclosures for conductors must be metallically joined into a continuous electric conductor and must be connected to all boxes, fittings, and cabinets to provide effective electrical continuity.(2) All wiring systems are prohibited …

[WSR 97-09-013, recodified as § 296-307-370, filed 4/7/97, effective 4/7/97. Statutory Authority: RCW 49.17.040, [49.17.]050 and [49.17.]060. WSR 96-22-048, § 296-306A-370, filed 10/31/96, effective 12/1/96.]

The installation of electric equipment and wiring used with cranes, monorail hoists, hoists, and all runways must meet the following requirements:(1) Disconnecting means must meet the following requirements:(a) A readily accessible disconnecting means is provided between the runw…

(1) Elevators, dumbwaiters, escalators, and moving walks must have a single means for disconnecting all ungrounded main power supply conductors for each unit.(2) If interconnections between control panels are necessary for operation of the system on a multicar installation that r…

(1) A disconnecting means must be provided in the supply circuit for each motor-generator arc welder, and for each AC transformer and DC rectifier arc welder that is not equipped with a disconnect mounted as an integral part of the welder.(2) A switch or circuit breaker must be p…

(1) If an electrically driven or controlled irrigation machine has a stationary point, a driven ground rod must be connected to the machine at the stationary point for lightning protection.(2) The main disconnecting means for a center pivot irrigation machine must be located at t…

[WSR 97-09-013, recodified as § 296-307-372, filed 4/7/97, effective 4/7/97. Statutory Authority: RCW 49.17.040, [49.17.]050 and [49.17.]060. WSR 96-22-048, § 296-306A-372, filed 10/31/96, effective 12/1/96.]

WAC 296-307-372 covers the requirements for electric equipment and wiring in locations that are classified based on the properties of the flammable vapors, liquids or gases, or combustible dusts or fibers that may be present and the likelihood that a flammable combustible concent…

These hazardous locations are classified as follows:(1) Class I locations. Locations in which flammable gases or vapors are or may be present in the air in quantities sufficient to produce explosive or ignitable mixtures. They include the following:(a) Class I, Division 1 locatio…

Equipment, wiring methods, and installations of equipment in hazardous locations must be intrinsically safe, or approved for the hazardous location, or safe for the hazardous location. Requirements for each of these options are as follows:(1) Equipment and associated wiring appro…

All conduits must be threaded and wrench-tight. Where it is impractical to make a threaded joint tight, a bonding jumper must be used.[Statutory Authority: RCW 49.17.010, 49.17.040, 49.17.050, and 49.17.060. WSR 20-21-091, § 296-307-37212, filed 10/20/20, effective 11/20/20. WSR …

Equipment that has been approved for a Division 1 location may be installed in a Division 2 location of the same class and group. General-purpose equipment or equipment in general-purpose enclosures may be installed in Division 2 locations if the equipment does not constitute a s…

In Class I, Division 1 locations, motors, generators and other rotating electric machinery must be:(1) Approved for Class I, Division 1 locations (explosion-proof); or(2) Of the totally enclosed type supplied with positive-pressure ventilation from a source of clean air with disc…

[WSR 97-09-013, recodified as § 296-307-374, filed 4/7/97, effective 4/7/97. Statutory Authority: RCW 49.17.040, [49.17.]050 and [49.17.]060. WSR 96-22-048, § 296-306A-374, filed 10/31/96, effective 12/1/96.]

(1) Wiring methods for fixed installations over 600 volts, nominal, must meet the following requirements:(a) Above-ground conductors must be installed in rigid metal conduit, in intermediate metal conduit, in cable trays, in cablebus, in other suitable raceways, or as open runs o…

This section applies to circuits, systems, and equipment intended to supply power for illumination and special loads, in the event of failure of the normal supply.(1) Emergency circuit wiring must be kept entirely independent of all other wiring and equipment and must not enter t…