AS NZS 5112 pdf download – Tunnel type terminal neutral bars for low voltage switchboards—Requirements for termination of copper conductors up to 50 mm
5.1 Required marking
The following marking information shall be provided:(a) Type reference (e.g. a catalogue number).
(b)Manufacturer’s or responsible vendor’s name or trade mark or identification mark.(c)The rated current in amps,e.g.63 A.
(i) The terminal for the MEN connection to the main earth, the letter’E’ or the
(ii) The terminal for the supply main neutral connection, the letter ‘N’.(iii) Every other terminal,from 1 in numerical sequence (see Note).
Exception: The marking of the MEN(E) and main neutral terminal (N) is not requiredif the MEN connection is at one extremity and the main neutral is the next adjacentferminal.
NOTE: Conventionally the terminals are marked in sequence from the left hand endor from the main neutral.
(e)AS/NZS 5112 (the number of this Standard).(f)Rated connecting capacity.
5.2 Location of marking
The marking shall be clearly discernible from the outside after the bar has been fixed as innormal use, but, if necessary, after removal of a cover.
Items (b), (c) and (d) shall be on the bar itself or may be on the bar support if the bar issupplied integral with a complete assembly (e.g. moulded into the support or by labelling).Items (a),(e) and (f) may be in the manufacturer’s or responsible vendor’s data.
5.3 Method of marking
The marking shall be legible and durable and shall be in accordance with AS/NZS 3100.5.4 Manufacturer’s instructions and data
Instructions shall be provided with the product or in the manufacturer’s data for thefollowing:
(a) The maximum connecting capacity, in mm2.
(b)Any requirements for prepared conductors， e.g. shoelace ferrules for flexible cables,
lug sizes for bolted terminals.Conductors solidified by solder are not permitted.The following recommendations apply:
(i)lt is recommended that Table 1 be supplied to show cable sizes for connection limits.(ii)lt is recommended that Table 2 be supplied to show the maximum torques with a note
that the torque must not be below 2/3 of these values.
The bars shall be provided with clamping facilities for securely terminating the conductorsused in normal service.
The clamping of conductors shall be secure, not loosen in normal service and not exceed theallowable temperatures.
6.2 Range of conductors and connection requirements6.2.1 Range of conductors to be connected
The bars shall be provided with means to clamp stranded，solid and flexible copperconductor as shown in Table 1. The conductors shall be unprepared and preparedconductors in accordance with the manufacturer’s instructions.
The maximum size of an unprepared conductor to be clamped shall be at least one sizelarger than the conductor with a current rating in Table 4 corresponding to the rated currentof the neutral bar.
Compliance shall be established in accordance with Clauses 7.3.1.l and 188.8.131.52.
NOTE:The test of 7.10 is carried out on the cable size corresponding to the rated current inTable 4,e.g. A 250A test is carried out on a 35 mm3in Table 4, and not on the maximumconnecting capacity of 50 mm’ which relates to Table 1,Clause 6.2.2 and 7.3.2.
6.2.2Maximum connecting capacity
The maximum connecting capacity is the largest unprepared stranded copper conductor sizein Table 1 that can be clamped.
Compliance shall be established in accordance with Clause 184.108.40.206.2.3 Separate terminals for individual conductors
The bars shall be provided with separate terminals for connecting each individual incomingand outgoing cable.
Compliance shall be established in accordance with Clause 220.127.116.11.2.4 Tunnel terminal types
One or more of the following tunnel terminal types, as defined in Clause 3.9, may be used:(a) Tunnel terminal with screws in direct contact with the conductors.
(b)Tunnel terminal with a ferrule or plate giving indirect pressure on the conductors
from the screw.
(c)Saddle terminals for incoming conductors.
Compliance shall be established in accordance with Clause 7.3.4.