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SAMLEX AMERICA INC. | 37
b) Closest Standard Ampere Rating of Fuse has been used - Refer to NEC-2014
(National Electrical Code) - Section 240.6(A)
c) Where Standard Fuse Rating does not match the required Ampacity (Col-
umn 2), the next higher Standard Rating of the fuse may be used - Refer to
NEC-2014 (National Electrical Code) - Section 240.4(B)
d) Type of fuse: Fast-acting, Current Limiting, UL Class T (UL Standard 248-15)
or equivalent
4) Columns 5 to 7 indicate minimum cable conductor size that is based on the following
2 considerations. Thicker conductor out of the following 2 considerations has been
chosen:
a) As per guidelines in NEC (2014) Table 310.15(B)(16) for allowable Ampacities of
Insulated Conductors running in raceway/conduit. Conductor size is based on:
(i) NEC Ampacity specified at Column 3,
(ii) Copper conductor with temperature rating of 75˚C/167˚F and
(iii) Ambient temperature of 30°C / 86°F
b) Voltage drop across the length of cables limited to 2% of 48 VDC i.e. 0.9 VDC
i) Voltage drop has been calculated by multiplying the Rated DC Input Current
(Column 2) and the resistance of the total length of Copper conductor (the
total length of conductor has been taken as 2 times the running distance
between the unit and the battery to cover 2 lengths of Positive and Negative
cable conductors).
ii) Resistance of the cable is based on Table 8.1.
5) Fuse in the battery circuit is primarily required for protection against short circuit in
the battery cable run. The size of this fuse has to be equal to or larger than the Rated
DC Input Current of the inverter at Column (2). Further, the Amp rating of the fuse
used for protecting a battery cable against short circuit has to be lower than the Am-
pacity of the cable so that the fuse blows before the cable insulation is damaged due
to overheating as a result of fault current higher than the Ampacity of the cable.
8.4.6.1
DC Input Connection for PST-1500-48
The DC input terminals for battery connection (8 & 9 in Fig 6.1) have nut and bolt con-
nection - bolt size is 5/16" (18 Threads per Inch). Use ring tongue type of terminals on
the wire ends to fit 5/16" bolt size.
2 pieces of ring terminal lugs have been provided for AWG#6 cable.
8.4.6.2
DC Input Connection for PST-600-48
The DC input terminals for battery connection (8 & 9 in Fig. 6.2) have 11 mm/0.433"
cylindrical hole with M-8 set screw.
DO NOT insert the stranded bare end of the wire directly into the tubular hole as the
set screw will not pinch all the strands, resulting in a partial/loose contact. Appropriate
terminal lug should be crimped/soldered to the bare wire end.
To ensure firm contact, 2 pieces of blade type terminal lugs have been provided for
AWG#10 cable.
SECTION 8 |
Installation
Summary of Contents for PST-1500-48
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