<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:10pt"><div id="yiv9717361876"><div><div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 10pt;"><div id="yiv9717361876"><div id="yiv9717361876yui_3_13_0_ym1_1_1390452681942_3576"><div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); font-family: HelveticaNeue, 'Helvetica Neue', Helvetica, Arial, 'Lucida Grande', sans-serif; font-size: 10pt;" class="yiv9717361876yui_3_13_0_ym1_1_1390452681942_3563" id="yiv9717361876yui_3_13_0_ym1_1_1390452681942_3575"><div id="yiv9717361876yui_3_13_0_ym1_1_1390357869309_4129">Sorry I'm going to short change you in this summary. I am just covering the <span style="font-size: 10pt;">electrical rules for submersibles which are an
adjunct & take priority over the G.L. rules "Electrical Installations," (190 pages), which cover all sea going ships. If you know how to </span><span style="font-size: 10pt;">design your 1 person submersible to G.L. electrical standards, you should be able to do the same for a </span><span id="yiv9717361876yui_3_13_0_ym1_1_1390357869309_4378" style="font-size: 10pt;">480 meter long super tanker.</span></div><div id="yiv9717361876yui_3_13_0_ym1_1_1390357869309_4129"> The materials used in construction of electrical machines, cables & apparatus are to be resistant to moist & salty sea
air, seawater & oil vapors. They aren't allowed to be hygroscopic & have to be flame resistant & self-extinguishing.</div><div id="yiv9717361876yui_3_13_0_ym1_1_1390357869309_4129"> Materials with high tracking resistance are to be used to support live parts.</div><div id="yiv9717361876yui_3_13_0_ym1_1_1390357869309_4129"> Pressure hull wall penetrators, underwater plug connectors & appliances directly connected to bus bars are designed for the next higher nominal insulation rating.</div><div id="yiv9717361876yui_3_13_0_ym1_1_1390357869309_4129"> Materials & insulation for electrical equipment used in water are assessed case by case.</div><div id="yiv9717361876yui_3_13_0_ym1_1_1390357869309_4129"> Networks with earthed neutrals aren't permitted.</div><div id="yiv9717361876yui_3_13_0_ym1_1_1390357869309_4129">Max of 50 volts for mobile appliances used in confined or damp
spaces. </div><div id="yiv9717361876yui_3_13_0_ym1_1_1390357869309_4129"> Chapter 2 section 11 B provides IP rating requirements for various electrical equipment. This section also provides dimensional rules for protective conductors.</div><div id="yiv9717361876yui_3_13_0_ym1_1_1390357869309_4129"> All electrical equipment essential for the safety of the submersible & it's crew is to be connected to </div><div id="yiv9717361876yui_3_13_0_ym1_1_1390357869309_4129">an independent main & emergency power supply system.</div><div id="yiv9717361876yui_3_13_0_ym1_1_1390357869309_4129"> The main power source has to consist of at least 2 mutually independent, redundant power generating systems. Exceptions may be permitted for vehicles with restricted range of service or</div><div id="yiv9717361876yui_3_13_0_ym1_1_1390357869309_4129">accompanied by a support ship. I am not sure whether this means that if you
have a 24V system,</div><div id="yiv9717361876yui_3_13_0_ym1_1_1390357869309_4129">that you could have 2 banks of 24V & draw from them simultaneously or 1 bank at a time if required.</div><div id="yiv9717361876yui_3_13_0_ym1_1_1390357869309_4129">To be continued.....</div><div id="yiv9717361876yui_3_13_0_ym1_1_1390357869309_4129">Alan</div><div id="yiv9717361876yui_3_13_0_ym1_1_1390357869309_4129"> </div><div id="yiv9717361876yui_3_13_0_ym1_1_1390357869309_4129"><br></div></div></div></div></div></div></div></div></body></html>