  We report on BeppoSAX observations of five transient black hole candidates
during their quiescent phase. We confirm these sources are X-ray faint,
improving on and complementing existing upper limits. We derive 1-10 keV upper
limits for GRO J0422+32, GRS 1009-45, 4U 1630-47 and XTE J1748-288, which range
from 2x10^32 erg/s to 5x10^34 erg/s. We positively detect GS 2023+338. Its
X-ray spectrum can be fit by a power law (photon index Gamma=1.9) or a thermal
bremsstrahlung (with kT= 7$ keV), converting in both cases to a 1-10 keV
unabsorbed luminosity of ~10^33 erg/s. These values are comparable to the ones
derived during an ASCA observation in 1994, indicating that the source remains
stable over a ~5 yr baseline.
