wiring size

[robertj]

I am wiring in a 240v immesion heater, Ctek M300 and a spur of plugs from a small consumer unit.
What wiring diameter is best for the immersion and plug spur please?

 

[matthewriches]

2.5mm heat resistant to the immersion element if its a 3kw immersion, if it's anything less then still use 2.5mm incase anyone ever sticks a big one in there.

1.5mm is fine for the charger from its own breaker (6 amp) or a fused spur.

Radial mains sockets are 2.5mm fed from a 16 amp breaker. Technically you could use 1.5mm but professional installs run with 2.5mm.

 

[robertj]

Mathew

thanks

 

[matthewriches]

Enjoy and be safe! I have to mention it but please consider having your handiwork checked afterwards to ensure everything is safe

Mathew

thanks

 

[Dave100456]

2.5mm heat resistant to the immersion element if its a 3kw immersion, if it's anything less then still use 2.5mm incase anyone ever sticks a big one in there.

1.5mm is fine for the charger from its own breaker (6 amp) or a fused spur.

Radial mains sockets are 2.5mm fed from a 16 amp breaker. Technically you could use 1.5mm but professional installs run with 2.5mm.

For the sake of absolute clarity; since the OP asked for diameter of wire; the answers from Matthew referred to cross sectional area. Hate to see you struggling with massively oversized cable!!

 

[matthewriches]

lmfao Try getting it in the terminals ha ha.... might have to shave a few strands off lol

 

[superheat6k]

This is a pretty good guide. For short runs 1.5mm2 is fine up to 16 amps, but 2.5mm2 will provide more resilience and cope better with voltage drop on longer runs.

https://www.dropbox.com/s/iglvw4j7s21i56j/Cable ratings.pdf?dl=0

 

[davidpbo]

Rightly or wrongly I used 2.5mm HO7 flex. A very robust cable used a lot for temporary mains installations. 2 twin sockets and a single. All onto 1 16A breaker with a 10ma trip over the simple consumer board. Very simple installation on small boat.