electrical services minimum requirement - NSW Public Works
electrical services minimum requirement - NSW Public Works
electrical services minimum requirement - NSW Public Works
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Part 2 - Switchboards and Associated Equipment<br />
Relay<br />
Type<br />
Mech. Life<br />
x 10 6<br />
Operations<br />
Base Contact Rating Min. No.<br />
of Contact<br />
Elements<br />
Plug-In<br />
Unit<br />
Retention<br />
Clips<br />
1 5 Plug-in 1.25I L 2 Yes<br />
2 10 Plug-In 7A @ 240V @ COS Ø= 0.4 2 Yes<br />
3 10 Fixed Mounting 5A @ 240V 4 -<br />
207.9.2 Time Delay Relays<br />
Time delay relays shall be adjustable over the entire range, as indicated, and the timing<br />
range shall not exceed 400% of the indicated setting.<br />
Time delay relays shall be capable of operating under the required duty in the<br />
surrounding ambient conditions with a supply voltage variation of ± 10% and a timing<br />
repeat accuracy of ± 2.5%. The details and <strong>minimum</strong> features indicated in the table in<br />
Clause 207.9.1 excluding <strong>minimum</strong> number of contact elements, also shall apply to time<br />
delay relays.<br />
Unless otherwise indicated, time delay relays shall be electronic operation.<br />
Electronic relays shall incorporate a LED which shall indicate energisation of the output<br />
relay.<br />
207.9.3 Control Switches<br />
Control switches shall be of the rotary switch type with cam operation and switch<br />
positions arranged with a displacement of 60º and, if an "OFF" position is required, it shall<br />
be located at the "12 o'clock" position.<br />
Contacts shall have <strong>minimum</strong> rated operational current (I e ) of 6 A at 240 V a.c. to<br />
utilisation category AC-15 or AC-23.<br />
Escutcheon plates shall be rectangular and shall allow function and switch position<br />
labelling to be included on the plate. Escutcheon plates shall be silver with black<br />
lettering. Where control switches are input to a PLC the contacts shall be low resistance<br />
wiping type.<br />
207.9.4 Push Button Switches<br />
Push Button switches shall be of the oil-tight type with <strong>minimum</strong> rated operational current<br />
(I e ) of 4 A at 240 V a.c. to utilisanaln category AC-15. Buttons shall be not less than 22<br />
diameter and shall all be selected from the same size range. Each switch shall be<br />
provided with a legend plate indicating its functions. In the case of latched "STOP" or<br />
"EMERGENCY STOP" push buttons instructions for releasing the latch shall be included<br />
either on the legend plate or on the face of the button.<br />
Buttons shall be colour coded to AS 1431 Part 2, Table 5.4.1 or the Drawings.<br />
In addition, illuminated push button switches shall comply with <strong>requirement</strong>s of Clause<br />
207.20.<br />
Page 46 MEW E101
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