Section 4387 - Combination Electrical Systems(a) Wiring suitable for connection to a battery or direct-current supply source shall be permitted to be connected to a 120-volt source, provided that the entire wiring system and equipment are rated and installed in full conformity to the requirements of this subarticle governing 120-volt electrical systems. Circuits fed from alternating current transformers shall not supply direct-current appliances.(b) The 120-volt alternating current side of the voltage converter shall be wired in full conformity with requirements for 120-volt electrical systems except for converters supplied as an integral part of an approved appliance.(c) All converters and transformers shall be listed for use in recreational vehicles and designed or equipped to provide over-temperature protection. To determine the converter rating, the following formula shall be applied to the total connected load, including average battery charging rate, of all 12-volt equipment:(1) The first 20 amperes of load at 100 percent.(2) Plus, the second 20 amperes of load at 50 percent.(3) Plus, all load above 40 amperes at 25 percent.(d) Fixtures or appliances having both 120-volt and low-voltage connections shall be listed or approved for dual voltage.(e) Autotransformers shall not be used.(f) When a unit is equipped with a 120-volt or 120/240-volt alternating-current system and/or a low-voltage system, receptacles and plug caps of the low-voltage systems shall differ in configuration from those of the 120- or 120/240-volt system. When a unit equipped with a battery or direct-current system has an external connection for low-voltage power, the receptacle shall have a configuration that will not accept 120-volt power.Cal. Code Regs. Tit. 25, § 4387
1. Repealer filed 9-7-73; effective thirtieth day thereafter (Register 73, No. 36).
2. New section filed 12-7-79; effective thirtieth day thereafter (Register 79, No. 49).
3. Amendment of section and NOTE filed 9-19-2011; operative 10-19-2011 (Register 2011, No. 38). Note: Authority cited: Section 18015, Health and Safety Code. Reference: Section 18025, Health and Safety Code.
1. Repealer filed 9-7-73; effective thirtieth day thereafter (Register 73, No. 36).
2. New section filed 12-7-79; effective thirtieth day thereafter (Register 79, No. 49).
3. Amendment of section and Note filed 9-19-2011; operative 10-19-2011 (Register 2011, No. 38).