Hazards can result from, but are not limited to, the following causes:

• Failures or faults in the electrical equipment resulting in the possibility of electrical shock or electrical fire;
• Failures or faults in control circuits (or components and devices associated with those circuits) resulting in the malfunctioning of the machine;
• Disturbances or disruptions in power sources as well as failures or faults in the power circuits resulting in the malfunctioning of the machine
• Loss of continuity of circuits that depend upon sliding or rolling contacts, resulting in a failure of a safety function;
• Electrical disturbances (e.g. electromagnetic, electrostatic or radio interference) either from outside the electrical equipment or internally generated;
• Stored energy (either electrical or mechanical);
• Audible noise at levels that cause health problems to persons.

Safety measures are a combination of the measures incorporated at the design (and/or redesign) stage(s) and those measures are required to be incorporated by the user.

Note: Section 4 of EN 292-2 deals with Safety of Machines and safeguarding.

Electrical components and devices shall be suitable for their intended use – e.g. industrial (heavy, light), commercial, leisure, domestic – and shall conform to relevant IEC standards where such exist.
The following table will be helpful in component documentation:
Summary of Visual Inspection
List of components relied on for safety (including all mains components)

Item No.	Drawing Ref.	Application /Function	Component Mfgr.	Mfgr. Type No.	Rating	Approval Marks
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

Comments: 4.3.1 Electrical equipment designed to operate correctly with conditions of supply:

As specified in 4.3.2 or 4.3.3, or
By user (annex B), or
By supplier in special case
4.3.2 AC supplies

Voltage; 90 – 110% nominal voltage Yes____ No____ NA____ Init____
Frequency; 99 – 101% of nominal continuous
Frequency; 98 – 102% short time Yes____ No____ NA____ Init____
(Note: short time may be specified by the user)
Harmonics; Distortion not to exceed 10% of total
r.m.s. voltage between live conductors Yes____ No____ NA____ Init____
Voltage unbalance in 3-phase supplies;
not to exceed 2% unbalance Yes____ No____ NA____ Init____
Voltage interruption; interruptions not more than 3 ms
At any random time Yes____ No____ NA____ Init____
Voltage dips not to exceed 20% peak voltage for one cycle Yes____ No ____ N/A____Init____ 4.3.3 DC supplies

From batteries: Voltage 85 – 115% of nominal voltage Yes____ No____ NA____ Init____ 70 – 120% of nominal voltage for battery operated vehicles Yes____ No____ NA____ Init____ Voltage interruption; not exceeding 5 ms From converting equipment: Voltage 90 – 110% of nominal range Yes____ No____ NA____ Init____ Voltage interruption Not exceeding 20 ms and no Less than 1 s between interruptions Yes____ No____ NA____ Init____ Ripple (peak to peak) Not exceeding 15% nom. Voltage Yes____ No____ NA____ Init____ Comments: 4.3.4 On-board power supply

For special supply systems such as on-board generators, the limits given in 4.3.2 and 4.3.3 may be exceeded provided that the equipment is designed to operate correctly with those conditions. Do special on-board conditions apply? Yes____ No____ NA____ Init____ Are these conditions documented? Yes____ No____ NA____ Init____

4.4.1 The electrical equipment shall be suitable for use in the physical environment and operating conditions as specified in 4.4.2 to 4.4.8, or annex B.

4.4.2 Electromagnetic compatibility (EMC)

…shall not exceed levels specified in the relevant … standards … dealing with EMC. Is there a test report available showing compliance with the EMC Directive (89/336/EEC) covering all aspects of radiated emissions, conducted emissions and immunity to incident emissions? Yes____ No____ NA____ Init____ NOTE: general solutions are listed in Section 4.4.2 of the referenced Standards Manual 4.4.3 Ambient air temperature

Enclosed electrical equipment +5oC to +40oC Yes____ No____ NA____ Init____ NOTE: For hot environments extra requirements may be necessary 4.4.4 Humidity

Humidity does not exceed 50% at the maximum temperature of 40oC Yes____ No____ NA____ Init____ NOTE: higher humidity is permitted at lower temperatures (e.g. 90% rh @ 20 oC) 4.4.5 Altitude

Operating up to 1000 meters above sea level Yes____ No____ NA____ Init____ 4.4.6 Contaminants

Properly protected against ingress of liquids and solids (See 12.3 and annex B) Yes____ No____ NA____ Init____ 4.4.7 Ionizing and non-ionizing radiation

Deterioration of insulation Yes____ No____ NA____ Init____ 4.4.8 Vibration, shock and bump

Protection against undesired effects Yes____ No____ NA____ Init____

Temperature range –25oC to +55 oC Yes____ No____ NA____ Init____ NOTE: Electrical equipment susceptible to damage at low temperatures including PVC cable insulation. Comments: Suitable means provided for removal of heavy, bulky electrical items (see 14.4.6) Yes____ No____ NA____ Init____ Comments: Detailed instruction manual(s) provided (See Section 18.8 for details) Yes____ No____ NA____ Init____ Comments: Notes: