ASME A17.5-2004 pdf – Elevator and escalator electrical equipment.
15 Wiring terminals and leads
15.1
Control equipment shall be provided with wiring terminals or leads for connection of conductors having an ampacity not less than the largest of the following:
(a) the ampere rating of the equipment;
(b) 125% of the full-load motor current specified in Table 10 or 11 for the horsepower rating or, in the case of power-conversion equipment In which the input current is different from motor full-load current, 125% of maximum rated input current,
(C) 125% of the resistive ampere rating of the devices intended to control fixed electric space-heating equipment loads; and
(d) for equipment controlling a direct-current motor intended to be operated from a rectified
single-phase power supply.
(I) 190% of full load current if a half-wave rectifier is used; or
(ii) 150% of full load current if a full-wave rectifier is used.
Note: Item (d) does not apply if the product is marked in accordance with Clause 20-18.
15.2
A device having a current rating or an hp rating with a full-load motor-running current as specified in Table 10 or 11 shall be provided with wiring terminals or leads for connections to wire of a size determined in accordance with the applicable electrical code. The size shall be based upon a wire suitable for a temperature of 60 C (140°F) for a rating of 100A or less, and upon a wire suitable for 75 C (167°F) for a rating greater than 100 A. The type of insulation is not specified.
15.3
A lead that is intended to be spliced to a ciituit conductor in the field shall be not smaller than No. 24 AWG,
and the insulation, if of rubber or thermoplastic, shall be not less than 0.8 mm (0.031 in) thick.
15.4
Terminal parts for field wiring connections shall conform to the requirements of CAN/CSA-C22.2 No. 0 or UL 508, except that for a No. 10 AWG or smaller conductor, the terminal to which wiring connections are made may consist of clamps or binding screws, and a terminal plate with upturned lugs or the equivalent to hold the wires in position.
15.5
A wire-binding screw to which field wiring connections are made shall be not smaller than No. 8, except that a No. 5 screw may be used at a terminal intended only for connection of a No. 14 AWG or smaller conductor and a No. 6 screw may be used at a terminal intended only for connection of a No. 12 AWG or smaller conductor.
15.6
A terminal plate tapped for a wire binding screw shall be of metal not less than 0.76 mm (0.030 in) thick for a No. 14 AWG or smaller wire, and not less than 1.27 mm (0.050 in) thick for a wire larger than No. 14 AWC. There shall be not fewer than 2 lull threads in the plate. Two full threads shall not be required if fewer threads result in a secure connection in which the threads will not strip upon application of a 2.3 Nm (20 IbI-in) tightening torque.
15.7
A terminal plate formed from stock having the minimum required thickness specified in Clause 15.6 may have the metal extruded at the tapped hole for the binding screw to provide two full threads.
15.81
Control equipment intended for cord connection to the power supply shall be provided with a suitable length, size, and type of hard-usage cord (see CSA C22. 1); junior hard service cord (see ANSI/NFPA 70); extra-hard-usage cord (see CS? C22.1); hard service cord (see ANSI/NFPA 70); or the equivalent permitted by the applicable elevator or electrical code, which shall terminate in an appropriate attachment plug.
15.8.2
Strain relief shall be provided so that a mechanical stress on the cord will not be transmitted to terminals, splices, or internal wiring. At the point at which the cord passes through the enclosure wall, protection shall be provided to prevent cord abrasion. The equipment shall withstand damage to the cord or conductors and shall withstand, without displacement, the test specified in Clause 19.10.