10 Ver. 0.2
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Grounding wires must be connected to the module frame at one of these locations.
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Great care should be exercised to ensure that corrosion caused by the grounding means is avoided.
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Corrosion can increase the resistance of the grounding connection on the module, or can even cause
the grounding connection to fail entirely.
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Corrosion can be caused by the effects of weather, humidity, dirt and so on. Corrosion can also be
caused when two dissimilar metals contact each other (galvanic action).
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All grounding hardware (nuts, bolts, washers, screws, etc.) must be stainless steel unless otherwise
specified (it should use corrosion-proof fixing material), as shown in Fig. 3.2.
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The grounding wire should not be smaller than 12 AWG.
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The grounding wire should be 2 meters in length, multi conductor and rated of 105°C and 600V.
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Recommended torque value is 2.3 N-m (20.4 lb-in).
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There are two approved methods to ground NSP modules.
Method (1) Grounding Using Bolt and Nut
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To the grounding hole, secure the grounding wire with stainless steel hardware consisting of bolt,
spring washer, flat washer, cup washer, star washer and nut as shown in Fig. 3.2.
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Length of bolts should not be more than 25 mm in order to avoid contacting the back sheet of module.
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The use of cup washer, also called terminal cup washers, is to prevent the grounding wire slipping out
from under the screw head (and/or the flat washer).
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To make sure the cup washer is placed between the wire and module frame.
Fig 3.1