Requirements for Cables used for Low-Voltage DC Mains (12-36VDC)

lauxt

Starting to get Involved
#1
Greetings,

I'm looking for some guidance on the power cable requirements when the mains supply is low voltage DC, i.e. 12-36V, typical for automotive and aerospace application. We are a medical power supply manufacturer, but have very little experience with the requirements for DC mains supplies.

Our customer requested a "peel-apart" or "lamp-cord" style input wire to facilitate easier installation.

The input current requirements necessitate a heavy gauge wire (12AWG), but this results in an extremely bulky cable if we use UL SPT-3 style lamp cord. The insulation thickness is pretty nuts, plus the flexibility is poor.

Are there separate requirements for this type of input? Does it need to be UL type? Does anyone have an experience or recommendations for cable type?

Thank you,
Tim
 
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lauxt

Starting to get Involved
#2
According to Subclause 6.2

"The term “Class III equipment” is used in some other standards to identify equipment that is powered from a safety extra-low voltage (SELV) mains supply system.....limitation of voltage is not sufficient to ensure safety of the PATIENT. For these reasons, this standard does not recognize Class III construction."

Therefore, IEC60601-1 does not really care if the power system/infrastructure is low voltage. It still needs to be treated as mains. Fine.

But, according to 8.11.3.2

"Any POWER SUPPLY CORD of ME EQUIPMENT shall be not less robust than ordinary tough rubber sheathed flexible cord (IEC 60245-1:2003, Annex A, designation 53) or ordinary polyvinyl chloride sheathed flexible cord (IEC 60227-1:1993, Annex A, designation 53)."


So, the input cable still needs to meet some mechanical requirement. My understanding is that a UL cable type will make life easier, but I suppose the answer is that *if* we can prove that some other non-UL cable is "as robust" then it's okay, but that description of cable requirements is seemingly so vague. I checked IEC60227 and it's very complex.

Can we apply UL817 35lb pull test with some non-UL cable (for instance, maybe automotive SAE J1128 style cable) and prove it is robust in this way?

Thanks.
 
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