PYXIS

Engineering

Corporation

PYXIS ENGINEERING CORPORATION

3839 Bret Harte Drive

Redwood City, CA 94061-1115

TEL 650/365-2694

FAX 650/365-2695

NET tom AT pyxiseng.com

 

 

 

 

 

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Industrial Electrical Engineering allows construction of efficient and safe machines.

The checklist below is helpful in identifying common requirements for industrial machines.

PLEASE NOTE THAT THE CURRENT NFPA 79 EDITION IS 2002 BUT THIS CHECKLIST MAY STILL HELP!

General Checklist for Inspection Standard NFPA 79

Electrical Standard for Industrial Machinery, 1994 Edition

 

Item

NFPA 79 Paragraph

Description

OK

Check

1.

4.2.1

Diagrams showing the electrical circuits of the machine.

 

 

2.

4.2.2

Diagram cross references for relays, switches, etc.

 

 

3.

4.2.4

Switch symbols shown with utilities off and machine in normal starting condition.

 

 

4.

4.2.5

Interconnected conductors shown with same alphanumeric reference, except smaller than AWG#18 in electronic assemblies.

 

 

5.

4.2.7

Interconnecting diagrams for separate enclosures of large systems.

 

 

6.

4.2.9

Plug/receptacle pin identification.

 

 

7.

4.3

Operating instructions, maintenance instructions, spare parts list.

 

 

8.

4.4

Durable identification plates.

 

 

9.

4.5

Warning label if disconnect does not de-energize all exposed live parts when in OFF position.

 

 

10.

4.6

Machine builders name, trademark, or other identification symbol.

 

 

11.

4.7

Permanent nameplate listing, in English, clearly identifying machine serial number, supply voltage, phase, frequency, full-load current, ampere rating of largest motor load.

 

 

12.

4.8

Additional identification provided if the nameplate is not easy to read.

 

 

13.

4.9

Functional identification for control devices, i.e. HAND-OFF-AUTO etc.

 

 

14.

5.2

Devices properly rated for temperature, altitude, humidity, and supply voltage.

 

 

15.

6.2

Live parts greater than 30 volts protected by insulation or enclosures.

 

 

16.

6.2

Electrical equipment and machine members grounded and bonded.

 

 

17.

6.3

Circuits less than 30 volts separated from higher voltage circuits.

 

 

18.

6.4

Safeguarding from residual voltages where present.

 

 

19.

7.1,2,3

Properly rated disconnecting means provided for each incoming supply circuit.

 

 

20.

7.4,8

Disconnecting means properly mounted, and open and closed position of disconnecting means identified.

 

 

21.

7.5

Disconnecting means opens all ungrounded conductors of single supply circuit simultaneously.

 

 

22.

7.8.2

Multiple disconnecting means grouped together.

 

 

23.

7.9

Disconnecting means mechanically or electrically interlocked with enclosure doors. Exception allowed if warning label attached and tool required to open enclosure.

 

 

24.

7.10

Disconnecting handle readily accessible.

 

 

25.

7.11

Attachment plug and receptacle for two horsepower or less, only.

 

 

26.

8.1,2,3

Overcurrent protection for supply conductors, and machine wiring (breaker, fuse, etc.).

 

 

27.

8.5

Motor branch circuits have proper overload protection.

 

 

28.

8.6

Motor overload device in all phases to protect from motor overloads.

 

 

29.

8.8

Resistance heating elements rated not over 48 amps. Special arrangements required for over 48 amp heaters.

 

 

30.

8.9

Motor control circuit conductors and transformers properly protected.

 

 

31.

8.11

Large power transformer circuits properly protected on primary and secondary.

 

 

32.

8.12

Control circuit transformer properly protected.

 

 

33.

8.14

Proper undervoltage protection for machinery that will malfunction below minimum voltage.

 

 

34.

9.1

Control circuit source of supply taken from load side of main disconnecting means.

 

 

35.

9.5

Stop circuits provided and function correctly.

 

 

36.

9.6,8,9,10

Start circuits include safety measures.

 

 

37.

10.2

Control components and wiring accessible within panels.

 

 

38.

12.1

Control equipment located so that it will not interfere with machine adjustments or maintenance.

 

 

39.

13.1

Pushbuttons and switches properly color coded.

 

 

40.

14

Associated lighting and receptacles properly installed if provided.

 

 

41.

15,16,17, 18,19

Circuits and wiring in accordance with the National Electric Code and all local codes.

 

 

42.

20.3

Programmable controllers shall be protected to require special people and equipment to modify.

 

 

43.

 

Operational check. Equipment operates properly and in accordance with established intent.

 

 

N/A = Not Applicable