UL 1238-2015 pdf download
UL 1238-2015 pdf download.Control Equipment for Use with Flammable Liquid Dispensing Devices.
21.6 Secondary circuits can be connected to the frame of the control equipment. Except as noted in 21.7
and 21.8, the connection shall be made at only one point in the equipment or system.
21.7 The frame can be used as the return for a secondary circuit supplied as indicated in 21.1 or 21.2.
21.8 A grounding bus of adequate ampacity that is used as the return f or a secondary circuit other than as covered by 21.7 can be anchored (connected) to the frame at more than one point.
21.9 When any secondary circuit of more than 42.4 volts peak is connected to the frame of the equipment, all exposed dead-metal parts are capable of becoming energized and all dead-metal parts within the enclosure that are capable of being touched by a person during operator servicing and that are capable of becoming energized shall be reliably connected together.
22 SeparatIon of CircuIts
22.1 A factory-installed conductor shall be separated by a barrier or segregated as specihed in 22.2 from a factory-installed conductor and from an uninsulated live part used In a different circuit.
Exception: Conductors provided with insulation rated for the highest voltage involved are not required to comply with this requirement.
22.2 Segregation of a conductor shall be accomplished by clamping, routing, or equivalent means that provides permanent separation from a conductor or an uninsulated live part of a different circuit.
22.3 The equipment shall be constructed so that a field-installed conductor of any circuit is segregated as specified in 22.5, o4 separated by a barrier (see 22.4) from:
a) A field-installed conductor connected to any other circuit, unless:
1) Both circuits are Class 2 or Class 3, or both circuits are other than Class 2 or Class
3 and
2) The conductors of both circuits are insulated for the maximum voltage of either
circuit.
b) An uninsulated live part of any other circuit.
Exception No. i: Field-installed conductors that come into contact with the wiring terminals of other cjrcuits complies with the intent of this requirement when provided with marked instructions that specify the use of Type RH, TW. RFH-2, or conductors that have been determined to be equivalent in accordance with the National Electrical Code, NFPA 70.
Exception No. 2: Feld-insta1Ied conductors having insulation less than that provided with the wires specified in Exception No. I. and that come into contact with low-voltage wiring terminals comply with the intent of this requirement when the short-circuiting of such te,rmnals does not result in a risk of fire or electric shock.
C) Any part that is sharp or exceeds the temperature rating of the field-installed conductor and is capable of damaging the field-Installed conductor. See 10.1.6 and 38.4.
d) A factory-installed conductor connected to any other circuit, unless the conductors of both circuits are installed for the maximum voltage of either circuit.
Exception: The field-installed conductors are not required to be separated by a barrier when installation instructions are included that explain the proper procedure for maintainr,g separation and which, .çon investigation, are found to achieve the required separation.
22,4 WIth regard 10 22.3, when the intended uses of the device are such that in some applications a barrier is required while in other applications no barrier is required, a removable barrier, or one having openings for the passage of conductors, is not prohibited from being employed. Instructions for the use of such a barrier are to be a permanent part of the device.
22.5 Field-installed conductors are not prohibited from being segregated from each other, and from uninsulated live parts or factory-installed conductors connected to different circuits of the device. This segregation is to be achieved by arranging the location of openings in an endosure for the various field-installed conductors with respect to the terminals or other uninsulated live parts and factory- or field-installed conductors so that a minimum 14 inch (6.4 mm) permanent separation is provided.
22.6 With regard to 22.5, when the number of openings in the enclosure does not exceed the minimum required for the intended wiring of the device, and when such openings are located opposite a set of terminals, it is to be assumed that a conductor entering an opening is to be connected to the terminals opposite that opening. When more than the minimum number of openings are provided, the possibility of a conductor entering an opening other than that opposite the terminal to which it is to be connected and contacting insulated conductors or uninsulated live parts connected to a different circuit is to be investigated in accordance with 10.1.6.
