I have created a draft specification for the DC Electrical Panel Replacement. It is attached in the Word file and pasted as text below. Please provide comments and recommendations.

1.0 Introduction: This document provides the specifications and parameters for a DC distribution panel as a replacement for the original equipment supplied with the J/30 Sailboat. The replacement panel is intended to provide the necessary isolation and circuit protection for original J/30 load requirements, and provide additional circuits for equipment that owners may have installed. The replacement panel is also intended to provide measurement capability for voltage and current.

2.0 Background: Information provided by J/30 owners revealed at least two different types of DC panels were supplied throughout J/30 production between 1979 and 1986. Older style panels were manufactured by Lorco and contained twelve toggle switches and twelve 3AG panel mounted fuse sockets with screw style caps. The panel measured 8.5" wide by 8" high. Some newer boats used a similar panel that measured 10" high by 6.325" wide. Additionally, some J/30 owners reported having a DC voltmeter mounted near the battery with a selector switch to monitor either battery. Not all J/30s were equipped with this meter.

3.0 Reference Documents: The following documents referenced in this document shall apply to the extent referenced herein.

3.1 Underwriters Laboratory specification UL-1077 - Supplementary Protectors for Use in Electrical Equipment

3.2 American Boat and Yacht Council (ABYC) Standard E-11 — AC & DC Electrical Systems on Boats

4.0 Requirements: The requirements specified below shall be met for the replacement 12 volt DC electrical panel.

4.1 Electrical Requirements: The DC Panel shall utilize hydraulic/magnetic trip-free circuit breakers that meet the requirements of UL-1077 and ABYC 11.10.1.5.

4.1.1 Main Breaker: The DC Panel shall have a single 50 amp circuit breaker with a 3000 amp interrupt rating that isolates the branch breakers.

4.1.2 Branch Breakers: The DC Panel shall have twelve branch circuit breakers. The breakers shall be available in the following ratings and may be specified individually at the time of order: 5, 10, 15, 20, 25, 30, 40 or 50 amps.

4.1.3 Bus Bars: The DC Panel shall have separate tin plated DC Negative Bus and DC Grounding Bus bars. The DC Negative bus bar is intended to be the DC return path for all loads. The DC Grounding Bus is not intended to be the load path, but will be connected to the DC Negative Bus. The bus bars shall have sufficient capacity for attaching the return path for each DC branch and the ground for each DC branch.

4.1.4 Multimeter: The DC Panel shall have a single splash proof panel mounted DC digital multimeter with the following attributes:
• Displays current in 0.1 Amp increments for -99.9 to +500 amp range, 1.0 Amp increments for -100 to -500 amp range with current monitored by installing a shunt supplied with the DC Panel on the negative side near the battery. This shunt is connected to the meter via 16 AWG twisted pair to minimize noise. The shunt shall be sized to match the desired current range with the multimeter sensitivity.

• Accuracy +/-0.5% corresponding to +/-1 least digit of resolution

• Four digits composted of seven segment displays with decimal point available to the right of each digit. Digits sized at 9/16" tall.

• Illuminated indicators that display Voltage (V) or Current (A) modes.

• Displays voltage from 0 to 60 Volts in 0.01 Volt increments

• Input 8 to 50 VDC to power meter with a maximum power consumption of 1.0 watt and standby power consumption of less than or equal to 0.15 watts

• Provides separate voltage and current terminals with a menu that allows selection between current and voltage.

• Menu selectable high and low voltage with audio and visual alarms

• Three levels of display brightness with a programmable sleep mode to blank display for power conservation

4.1.5 Voltage Selector Switch: A three position switch shall be provided to select the DC voltage monitor point for the Multimeter. The points to be monitored include Battery 1, Battery 2 and DC Panel Bus. Connection to the DC Panel Bus shall be internal to the panel. Connection to the switch for Battery 1 and Battery 2 shall be via screw terminals using external 16 AWG wire fused near the battery and provided by the installer.

4.1.5: Panel Illumination: The panel shall have back lighting that is powered from the load side of the main breaker with the illumination load for all back lights less than 90 milliamps. The back lighting is intended to illuminate circuit breaker labels. LED indicators shall be provided next to each circuit breaker that illuminate when the respective breaker is closed.

4.2 Mechanical Requirements: The DC Panel shall be 11" wide, 8.25" high and extend no more than 3.5" behind the panel. The panel shall be fabricated from 0.125" corrosion resistant aluminum. All component mounting hardware and the panel mounting hardware shall be countersunk resulting in a flush surface.

4.2.1 Hinge: The panel shall be configured with a hinge that extends along the bottom edge of the panel, allowing the panel to swing down for service. The hinge shall be mounted with recessed hardware so the panel covers the hinge when closed. The hinge shall be recessed into the back side of the panel so the entire assembly may be mounted flush.

4.2.2 Finish: The panel shall be painted black with a two part polyurethane finish. A 0.125" white accent line shall be painted around the outer edge with radiused corners. White lettering shall be painted on the panel as follows:

• 12 Volts DC - Above left row of Circuit Breakers

• Battery 1, DC Bus, Battery 2 - adjacent to voltage selector switch and aligned to switch positions

• J/30 - using "Souvenir" truetype font with bold & italic attributes and 0.5" high letters. The logo shall be centered along the bottom section, interrupting the solid white line with a 0.25" gap on either side to separate from the white line.

4.2.3 Component locations: The DC Panel shall be configured with two columns of circuit breakers. The top left breaker shall be the main breaker. Below this shall be seven branch breakers. The right column shall have the multimeter and voltage selector switch mounted at the top. Below these components shall be five branch breakers.

4.2.4 Circuit Breaker Selection & Labels: Circuit breaker labels shall be replaceable polycarbonate material with black opaque background and translucent letters that permit the backlight to illuminate the text. The main breaker shall be labeled Main 50 AMPS. Branch breaker labels shall be selectable from standard supplier offerings for each order. Branch breakers may be specified at time of order per paragraph 4.1.2.

4.3 Wiring: The DC Panel shall be delivered with all internal panel connections wired. All external connections for supply, load, current sense and battery voltage sense shall have screw terminals to accommodate properly sized wire per ABYC E- 11.16.1.2.2 and connections per ABYC E-11.16.4.1.11 supplied by the installer.