SDMO R 340 U, Руководство пользователя и по обслуживанию

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d) Safety guidelines
References: NFC 15-100:2002 (France) - IEC: 60364-5-54
In order to protect personnel against electric shocks, this generating set is equipped with a differential residual current protector
"factory" set to trigger instantly, with a sensitivity of 30 mA.
Any modification to this setting could endanger personnel. Any modification would render the user liable, and
must only be performed by qualified and authorised personnel.
When the generating set is disconnected from a facility after use, the master differential protector must be
returned to its "factory" settings, and this must be checked by trained personnel.
Important
For effective protection against electric shocks, the generating set needs to be earthed. To do this, use a copper wire, with a
minimum cross-section of 25 mm
2
for a stripped cable and 16 mm
2
for an insulated cable, connected to the generating set earth
socket and a galvanised steel earthing rod embedded vertically into the ground.
The earthing rod resistance value should comply with the values shown in the table below.
Note: use the highest differential setting from the installation as a guideline.
The resistance value is calculated in the following way:
For a default voltage of 25 V and a default current of 30 mA, this rod must be of a minimum length of: see table below:
Nature of ground
Length of
rod in
metres
Thick arable land,
moist compact ballast
1
Lean arable land,
Gravel, coarse ballast
1
Bare stony soils, dry sand,
impermeable rock
3.6
To obtain an equivalent length, you can use several earthing rods
connected in parallel and set apart by at least their length.
Example: 4 interconnected 1 metre rods separated by 1 metre.
Note: For the United States (National Electrical Code reference NFPA-70).
The generating set must be earthed. To do this, use a copper wire with a minimum cross-section of 13.3 mm² (or AWG 6, at most)
connected to the generating set earth socket and a galvanised steel earthing rod fully embedded into the ground vertically.
This earthing rod embedded fully in the ground must have a minimum length of 2.5 m.
3.5. Special arrangements
Generating sets are not fitted with protection against power surges caused by drops in atmospheric pressure or manoeuvring.
The company does not accept any responsibility regarding damage caused by these occurrences.
However, lightning conductors can be installed, on the understanding that this does not give total protection.
R = Ul
I
Δ n
Maximum resistance value of the earth socket R ( Ω ) according to the differential unit operational
current (operation time should not be longer than 1 second).
I Δ n
differential
Earth R
( Ω )
Ul: 50 V
Earth R
( Ω )
Ul: 25 V
≤ 30 mA 500 > 500
100 mA 500 250
300 mA 167 83
500 mA 100 50
1A 50 25
3A 17 8
5A 10 5
10A 5 2.5
The Ul value: 25 V is required for work site installations, and livestock buildings, etc.
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