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A power line for an electrical submersible pump has three metallic impermeable tubes. A single electrical conductor is located within each of the tubes. Each conductor has at least one elastomeric insulation layer surrounding it. An annular portion of the insulation layer of each of the electrical c

A power line for an electrical submersible pump has three metallic impermeable tubes. A single electrical conductor is located within each of the tubes. Each conductor has at least one elastomeric insulation layer surrounding it. An annular portion of the insulation layer of each of the electrical conductors is in tight contact with the tube to form a seal. The annular portions may be annular crimps formed in the tube at intervals. The annular portion could also be a continuous seal caused by swelling of the insulation layer due to contact with a hydrocarbon.

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We claim: 1. An apparatus for pumping well fluid, comprising: a submersible pump; a submersible electrical motor operatively connected to the pump, the motor having a housing with a cylindrical head at one end; three slots formed in a sidewall of the head. the slots being spaced circumferentially a

We claim: 1. An apparatus for pumping well fluid, comprising: a submersible pump; a submersible electrical motor operatively connected to the pump, the motor having a housing with a cylindrical head at one end; three slots formed in a sidewall of the head. the slots being spaced circumferentially apart from each other, defining a web between adjacent ones of the slots; a passage leading from each of the slots into an interior of the housing; three metallic impermeable tubes; a fastener on each of the tubes, each of the fasteners being within one of the slots and securing one of the tubes to the head, the webs separating the fasteners from each other; a single electrical conductor within each of the tubes, each of the conductors extending through one of the passages into the interior of the housing for supplying power to the motor; at least one elastomeric insulation layer surrounding each of the conductors; and an annular portion of the insulation layer of each of the electrical conductors being in tight contact with the tube over at least a portion of the axial tube in which it is located to form a seal therebetween. 2. The apparatus according to claim 1, wherein each of the annular portions comprises a crimp formed in and circumferentially around each of the tubes, the crimps being at intervals along a longitudinal axis of the tube apart from each other. 3. The apparatus according to claim 1, wherein an unsealed area exists between the insulation layer and each of the tubes, other than at the seal, to accommodate thermal expansion of the insulation layer. 4. The apparatus according to claim 1, further comprising a dielectric oil in contact with the insulation layer within each of the tubes to cause swelling of the insulation layer to form the seal. 5. The apparatus according to claim 1, wherein the annular portions that form the seals are spaced apart from each other along a longitudinal axis of the tube, and an unsealed area exists between the insulation layer and each of the tubes in a section between adjacent ones of the annular portions to accommodate thermal expansion of the insulation layer. 6. The apparatus according to claim 1, wherein each of the annular portions comprises a crimp formed in and circumferentially around each of the tubes, the crimps being at intervals apart from each other alone a longitudinal axis of the tube; and each of the insulation layers has a coating of oil to cause swelling of the insulation layer within each of the tubes between adjacent ones of the crimps. 7. The apparatus according to claim 1, further comprising a power cable having three insulated wires located within a single elastomeric jacket, each of the wires being spliced to one of the conductors. 8. An apparatus for producing well fluid, comprising: a wellhead member; a tubing hanger landed in the wellhead member; a string of tubing supported by the tubing hanger; an electrical submersible pump and motor suspended on the string of tubing, the motor having a housing with a cylindrical head at an upper end and a longitudinal axis; three axially extending slots formed in a sidewall of the head, the slots being spaced circumferentially apart from each other, defining a web between adjacent ones of the slots; a passage leading from each of the slots into an interior of the housing; three metallic impermeable tubes, each of the tubes being sealingly connected to the motor; a fastener on each of the tubes, each of the fasteners being within one of the slots and securing one of the tubes to the head, the webs separating the fasteners from each other; a single electrical conductor within each of the tubes for supplying electrical power to the motor, each of the conductors extending through one of the passages into the interior of the housing; an elastomeric insulation layer surrounding each of the conductors; and a plurality of annular crimps formed circumferentially around and in each of the tubes at spaced intervals along a longitudinal axis of each of the tubes, each of the crimps being over at least a portion of the axial length of each of the tubes for forming seals between each of the insulation layers and each of the tubes. 9. The apparatus according to claim 8, wherein to accommodate thermal expansion of the insulation layers, a non-sealing area exists between each of the insulation layers and each of the tubes, the non-sealing area being located between adjacent ones of the crimps. 10. The apparatus according to claim 8, further comprising a hydrocarbon fluid in contact with the insulation layer to cause swelling of the insulation layer within each of the tubes. 11. The apparatus according to claim 8, further comprising a power cable spliced to the conductors at upper ends of the tubes and extending up to the tubing hanger, the power cable extending from the tubing hanger to the tubes and having three insulated electrical conductors, each having layer of elastomeric insulation and embedded within a single elastomeric jacket. 12. The apparatus according to claim 8, wherein each of the tubes extends continuously from the motor to the tubing hanger. 13. The apparatus according to claim 1, wherein the housing of the motor is filled with a dielectric liquid, and wherein the insulation layer within each of the tubes is in fluid communication with the dielectric liquid. 14. A method of supplying power to a submersible motor of an electrical submersible pump assembly, comprising: (a) providing a motor with a housing having a cylindrical head, three axially extending slots formed in a sidewall of the head, the slots being spaced circumferentially apart from each other, defining a web between adjacent ones of the slots, and a passage leading from each of the slots into an interior of the housing; (b) providing three metallic impermeable tubes, placing a fastener on each of the tubes, placing each of the fasteners within one of the slots and securing each of the tubes to the head with the fasteners so that the webs separate the Fasteners from each other; (c) positioning an electrical conductors within each of the tubes such that each of the tubes contains a single one of the electrical conductors, each of the conductors having a layer of elastomeric insulation; (d) causing an annular portion extending circumferentially around the insulation layer of each of the electrical conductors to be in tight contact with the tube in which it is enclosed to form a seal therebetween, the annular portion extending over at least a portion of the axial length of the tube; and (c) supplying electrical power to the conductors. 15. The method according to claim 14, wherein step (d) comprises crimping circumferentially around and in each of the tubes at intervals along a longitudinal axis of each of the tubes. 16. The method according to claim 14, wherein step (d) comprises contacting the insulation layer of each of the conductors with a hydrocarbon fluid to cause swelling of the insulation layer. 17. The method according to claim 14, wherein: step (c) comprises providing an unsealed area between each of the insulation layers and each of the tubes; and step (d) comprises forming crimps circumferentially around and in each of the tubes at selected intervals along a longitudinal axis of each of the tubes and leaving portions of the unsealed area between the crimps to accommodate thermal expansion of each of the insulation layers. 18. The method according to claim 14, wherein step (c) comprises: providing a power cable having three insulated wires surrounded by a common sheath; splicing each of the wires to one of the conductors in one of the tubes; and extending the power cable from the conductors to a wellhead member. 19. The method according to claim 14, wherein step (b) comprises extending each of the tubes from the pump assembly to a tubing hanger supported in a wellhead housing.