Is there a converter or adapter for nema 10-30 plug and 6-15 6-30 receptacle?

No, there is not a converter or adapter for a NEMA 10-30 plug and a 6-15 or 6-30 receptacle. The NEMA 10-30 plug is a three-prong, 30-amp plug that is commonly used for air conditioners and other appliances that require a lot of power. The 6-15 and 6-30 receptacles are two-prong, 15-amp and 30-amp receptacles that are commonly used for household items such as lamps and vacuum cleaners. The different shapes and prong configurations of these plugs and receptacles make it impossible to connect them directly. Additionally, the NEMA 10-30 plug is rated for a higher amperage than the 6-15 and 6-30 receptacles, which could cause the receptacles to overheat and pose a safety risk.