FAQ
TL;DR: Bosch PIE631FB1E typically runs on 2 phases + N ("the board is connected to 2F and N") — don’t wire it as 3‑phase. Use dedicated circuits and the factory links. [Elektroda, PtasiorWro, post #16937150]
Why it matters: This FAQ helps DIYers and installers avoid miswiring, nuisance trips, and warranty loss when connecting Bosch PIE631FB1E in multi-phase homes.
Quick Facts
- Typical hookup: 2F+N+PE; the L3 terminal is present but not internally used on many hobs. [Elektroda, Anonymous, post #16938436]
- Neutral often requires a factory bridge (N1–N2) at the terminal block; use the supplied link plates. [Elektroda, Topolski Mirosław, post #16944555]
- Put hob, oven, and dishwasher on separate dedicated circuits to protect warranty and safety. [Elektroda, Topolski Mirosław, post #16944555]
- Color IDs must be verified by testing: blue as neutral, yellow‑green as protective is expected but confirm first. [Elektroda, ta_tar, post #17762162]
- 5‑core supply shown in user photos (PE, N, and three phase conductors) for mapping to L1/L2/N. [Elektroda, Robert2207, post #17762074]
Can I connect the Bosch PIE631FB1E using all three phases (3F)?
No. This hob is intended for 2 phases plus neutral. The L3 terminal exists but is not internally connected on many units. Connecting it as true 3‑phase provides no benefit and invites errors. "The third connection phase is free and not connected to anything inside (L3)." Keep to 2F+N+PE as per the terminal diagram and supplied links. [Elektroda, Anonymous, post #16938436]
Can one blue neutral wire serve N1 and N2 on the terminal?
Yes. The neutral is typically bridged (N1–N2) using the manufacturer’s link plate. Do not DIY a makeshift jumper; use the supplied bridge and torque to spec. The thread confirms “in the first upper drawing from the left you have bridged N,” reflecting standard hob terminals. [Elektroda, Topolski Mirosław, post #16944555]
Is it OK to replace 16 A breakers with 20 A on a 5×2.5 mm² run?
Do not upsize breakers without a design check. The hob, oven, and dishwasher should each have dedicated circuits sized per documentation. Upsizing can void warranty and reduce safety margins. The thread stresses separate circuits and that a qualified person must perform the connection per the manual. [Elektroda, Topolski Mirosław, post #16944555]
How should I share phases between hob, oven, and dishwasher?
Give the hob its own dedicated circuit on 2F+N. Move the dishwasher to a different socket circuit and reserve the unused phase for the oven if needed. This reduces simultaneous load on any single phase and improves selectivity. [Elektroda, PtasiorWro, post #16937150]
What do L1, L2, L3, N1, and N2 on the hob terminal block mean?
L1 and L2 are the two live phases used by the hob. N1 and N2 are neutral posts, usually linked with a factory bridge. L3 exists on many blocks but is not used internally for this model class. Connect PE to the earth terminal. [Elektroda, Anonymous, post #16938436]
How do I verify each conductor before connecting the hob?
Open the distribution board and check labeling and protections. Take clear photos of breakers and descriptions, then confirm phase, neutral, and PE with proper testing equipment. If unsure, stop and engage a qualified electrician. The thread explicitly asks for board photos to confirm the supply layout. [Elektroda, ta_tar, post #17762263]
Are wire colors reliable? Is blue definitely neutral and yellow‑green PE?
Expect blue as neutral and yellow‑green as protective earth, but verify with measurement. Do not trust colors alone. A tester or professional verification is required before energizing. “I hope blue is neutral and yellow‑green is protective” highlights why verification matters. [Elektroda, ta_tar, post #17762162]
What happens if I wire the hob as 3F or cross phases and neutral?
You risk permanent damage. As one expert warned, connect it as 3F and "you will have to buy a new board." Miswiring can also trip breakers and void warranty. Keep to 2F+N+PE and follow the terminal diagram. [Elektroda, PtasiorWro, post #16937150]
How do I wire a 5‑core cable to a 2F+N hob terminal? (3‑step)
- Identify PE (yellow‑green), N (blue), and select two phase conductors for L1 and L2.
- Fit the factory bridge between N1 and N2; land blue on the bridged neutral.
- Land two phase conductors on L1 and L2; cap or park the third phase safely if present.
Use the markings shown in the referenced mapping. [Elektroda, Robert2207, post #17762074]
Can I add 230 V sockets to phases 2 and 3 from the hob feed?
Do not branch general sockets from the hob’s supply. The hob requires a dedicated circuit. Socket circuits must be separate and protected accordingly to maintain safety and warranty. Follow the manual and use a certified installer. [Elektroda, Topolski Mirosław, post #16944555]
Who must perform the final connection to keep my warranty valid?
A person with a valid qualification certificate must connect the hob. The thread states this clearly and notes it is written in the manual. Keep documentation of the installation for warranty claims. [Elektroda, Topolski Mirosław, post #16944555]
Is the L3 terminal internally connected on this Bosch hob class?
No. The L3 terminal is often present only to park a conductor. "The third connection phase is free and not connected to anything inside (L3)." Do not attempt to power the hob across three phases. [Elektroda, Anonymous, post #16938436]
