The residual current circuit breaker is the life-safety device in your DB — it trips on a 30 mA leak before a shock turns fatal. CPWD prices supply + fixing + testing in the existing DB, by rating.
Preliminary Using CPWD DSR E&M 2022 item rates as published, this worked scenario adds up to ₹2,642 (items 2.14.2). The item rates are CPWD's Delhi base rates; the quantities and the item mix are NirmanDost's scenario, not a CPWD bundle — adjust both to your site and apply your local cost index.
Supplying and fixing following rating, double pole, (single phase and neutral), 240 volts, residual current circuit breaker (RCCB), having a sensitivity current 30 mA in the existing MCB DB complete with connections, testing and commissioning etc. as required — 40 amps40 A double pole — the common single-phase house incomer
Each
₹2,642
1
₹2,642
Total
₹2,642
What goes into one unit
Straight from CPWD's own rate analysis for these items — the
material and labour they price into the rate above, per one unit of the item. Multiply
by your quantity to get a shopping list. Carriage lines are left out: those pay for
moving the material, not for extra material.
One Each of item 2.14.2 — Supplying and fixing following rating, double pole, (single
Item
Qty
Unit
In site terms
40 amps. rating, 2 pole RCCB, 100mA/ 300mA
1
each
Wireman
0.05
day
Khallasi
0.05
day
Rates and quantities are CPWD's published figures, not a market
quotation. Local rates differ — you can override them in
the BOQ Builder.
Supplying and fixing following rating, double pole, (single phase and neutral), 240 volts, residual current circuit breaker (RCCB), having a sensitivity current 30 mA in the existing MCB DB complete with connections, testing and commissioning etc. as required — 25 amps
Supplying and fixing following rating, double pole, (single phase and neutral), 240 volts, residual current circuit breaker (RCCB), having a sensitivity current 30 mA in the existing MCB DB complete with connections, testing and commissioning etc. as required — 63 amps
Supplying and fixing following rating, double pole, 240 volts, isolator in the existing MCB DB complete with connections, testing and commissioning etc. as required — 40 amps
Each
₹435
1
₹435
Total
₹435
Notes
An RCCB protects against earth leakage, not overload — you still need MCBs on each circuit.
All items here are double pole, 240 V, 30 mA sensitivity, fixed in an existing DB.
Rates shown are CPWD Delhi base rates from CPWD DSR E&M 2022, as published (our extract of the book is dated 2026-06-12) — apply your local market / cost-index variation.
CPWD has published later editions since (its site lists DSR E&M 2025); the 2022 figures here are reference rates, not the schedule in force for a current tender.
The item mix and quantities on this page are a NirmanDost worked scenario; the rates, units and descriptions in each row are CPWD's, verbatim. Every code opens in CivicMate for the source row.