To clarify the question a little more. This is strictly a question of what is generally safe for the human body with dry hand contact. This has nothing to do with insulation rating. I know this question can get real complicated with body resistance and actual current across the heart etc.
Here is the Pomona listing for banana patch cord
Model B: Multi-stacking Banana Plug Patch Cord features a nickel plated finish
Available in 10 colors: Black, Red, Blue, Orange, Green, Violet, Yellow, Gray, Brown, or White
Model 2948: Multi-Stacking Banana Plug Patch Cord features a gold-plated finish
Available colors: Black or Red
Cable: 18 AWG Wire, 0.144in (3.56mm) O.D.
Rating: For CE compliance and for personal safety, do not hold in hand when voltages exceed 33 Vrms / 70 Vdc. Maximum voltage for hands free use: 5000 Vdc.
Here is an excerpt from a Tektronix technical brief on floating oscilloscope measurements.
This warning applies to circuits
that have voltages of
greater than 30 VRMS (>42 Vpk).
If the circuit under test has
voltages that exceed 30 VRMS
(>42 Vpk), the TDS3000 Series
chassis needs to be connected
to earth ground using the
grounding wire provided with
the instrument (Battery Pack)
to prevent electrical shock to
the operator.
From a fluke scopemeter page
To avoid risk of electrical shock, use only the following accessories when a ScopeMeter COM input is connected to >42V peak (30V rms):
So where did this 30V rms 42V peak come from and why is Pomona showing 33V rms 70Vdc?