HP Compaq CV5500 Reference Manual page 40

Agency Regulatory Notices
or 18AWG, and the length of the cord must be between 6 feet
(1.8 m) and 12 feet (3.6 m). If you have questions about the type
of power cord to use, contact your HP authorized service
provider.
A power cord should be routed so that it is not likely to be walked
on or pinched by items placed upon it or against it. Particular
attention should be paid to the plug, electrical outlet, and the
point where the cord exits from the product.
Reference Guide C–5