Are rainproof fittings to connect meter box and weather head to rigid steel conduit required?

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I know you're in the UK, but I'll answer for the US in case someone there has the same question.

Boilers and furnaces must be powered by a separate, grounded circuit.

Any metal piping system that is likely to become energized must be bonded, including gas pipes, but the equipment grounding conductor run with the circuit conductors feeding a gas appliance "shall be permitted to serve as the bonding means":

NEC 250.104 (B) Other Metal Piping.

Where installed in or attached to a building or structure, a metal piping system(s), including gas piping, that is likely to become energized shall be bonded to the service equipment enclosure, the grounded conductor at the service, the grounding electrode conductor where of sufficient size, or the one or more grounding electrodes used. The bonding jumper(s) shall be sized in accordance with 250.122, using the rating of the circuit that is likely to energize the piping system(s). The equipment grounding conductor...

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My circuit box door says that Dryer and outside outlets are connected on breaker 13 and 14, uppon opening the box and retracing wires I found that Dryer wires are just dangling inside the box not connected. I would connect them to the breaker where it says it's supposed to be, but the wire for outside outlets is just so thick that I don't believe it's for those outlets (7 outlets and wire is 8 or 6 gauge, while dryer is 10 or 12). The two breakers are 50amp (red on one, black on other). Would I be safe connecting Dryer wire to those breakers also? Or am I better off replacing the two NA 20 amp breakers (they are for laundry plug and furnace black wire each) with two 50 amp breakers and connecting red wire for dryer on one and black on other?

Or should I replace those NA 20amp breakers with one 20amp tandem and one 30amp...

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