A 600 W corded impact drill with a 13 mm keyless chuck and a 210 mm depth stop is the workhorse spec an electrical installer reaches for on switch boxes, conduit entries, and panel backplates [S1].
Specifying the tool means matching chuck capacity to bit shank, motor power to hole diameter in masonry, and hammer energy to the substrate, not chasing the highest joule rating on the shelf. The 240 V mains-powered Bosch GSB 13 RE package (600 W, 13 mm keyless chuck, 210 mm depth stop) is the reference point for that tier of work [S1].
Chuck Capacity and Shank Match
A 13 mm keyless chuck accepts the full range of 1-13 mm straight-shank and 1/4" hex-shank bits commonly stocked on an electrical van, while a 10 mm chuck is limited to bits up to that diameter [S1]. Electrical install work splits into two bit families: round-shank HSS and masonry bits for wall plates, and 1/4" hex quick-change for drivers, nut setters, and step bits. Choosing a chuck that takes both removes the need for a second tool on small fit-out jobs [S3]. The Bosch GSB 13 RE's 13 mm keyless chuck covers the larger 12 mm masonry bit often used for cable gland entries on steel enclosures [S1].
Motor Power, Hammer Energy, and Duty Cycle
For electrical installation, motor power dictates how the drill copes with sustained masonry work, not peak RPM. A 600 W motor handles 6-10 mm holes in concrete and brick for several minutes before thermal cut-out risk rises on a hot site [S1]. The Bosch EasyImpact 600 (600 W) and the more powerful UniversalImpact 700 (700 W) both target this trade bracket on UK retail, with the 700 W unit priced around £89.98 against the 600 W at £42.29 [S1]. Hammer-impact energy for impact (mechanical) drills in this class is below 2 J per stroke, which is the engineering reason they are sold as "impact drills" rather than SDS-Plus rotary hammers; the boundary matters because anything above ~2 J typically requires SDS bit shanks, not the 13 mm chuck format [S4].
Depth Stop, Side Handle, and Switch Controls
A 210 mm depth stop is the minimum useful length for drilling through a standard 100 mm plasterboard + block wall plus the back-box cavity without over-penetrating into the cavity behind [S1]. Hitachi/Hikoki DV 16V documentation calls out the same depth-gauge logic, with the change lever switching between "impact" and "rotation" modes and the side handle marked R/L for handedness [S4]. Variable-speed triggers and forward/reverse brush buttons (R and L marks) are the two controls you actually need for electrical work: variable speed for pilot holes in metal back-boxes, reverse for backing out jammed bits in timber framing [S4]. Cordless alternatives in the same family typically run 18-20 V with 10 mm or 13 mm chucks and 32 mm impact mechanisms, per current manufacturer listings [S5].
Corded vs Cordless on the Electrical Site
Corded 240 V models win on sustained masonry drilling because the motor is not derated by battery state-of-charge; the 600 W Bosch GSB 13 RE runs as hard on hole 200 as on hole 1 [S1]. Cordless 18 V impact drills (e.g. 10 mm Populus ball-type or 32 mm Feihu impact-mechanism types) make sense for overhead work where trailing leads snag or for trim-out phases after first-fix [S5]. On a 230/240 V European site, the 240 V-rated tool is the safe default; on a 120 V North American site, the same model line at 120 V exists but at lower torque, so the spec sheet must be checked against site voltage before purchase. A practical rule: pick corded for any continuous run of more than 30 holes per day, cordless for routing and trim.
Bits, Accessories, and What the Chuck Has to Take
For electrical installation, the bit drawer is dominated by masonry bits (6, 8, 10 mm for wall plugs), HSS bits (3-10 mm for metal back-boxes), step bits (4-20 mm for panel gland entries), and 1/4" hex driver bits for socket and switch screw fixings [S3]. The Hitachi DV 16V's hook (A) accessory point and supplied chuck wrench are still standard kit on impact drills in this class, even where keyless chucks dominate retail [S4]. Bits sold as "impact-rated" on industrial B2B listings are typically rated for the higher torque of impact drivers rather than the lower-impact-per-stroke impact drill, so any bit shared across both tools should carry an explicit impact-driver or impact-drill marking [S3]. A 13 mm keyless chuck takes all of the above shank formats without an adapter, which is why 13 mm is the spec floor for a kit that has to cover both first-fix and second-fix electrical phases [S1].
Safety, Standards, and What to Check Before Each Shift
Impact drills on construction sites fall under the same hand-tool safety provisions as other portable power tools: double-insulated construction (Class II) and a residual-current device (RCD, 30 mA) on the supply are baseline requirements for 240 V mains operation. For fixed-installation follow-on work governed by drive systems, the NEMA ICS 7.1-2014 standard covers selection, installation, and operation of adjustable-speed drive systems rather than handheld drills, and is the adjacent reference document for site engineers specifying motor-driven equipment downstream of the drilling phase [S2]. Inspect the chuck for radial play, the side handle for thread damage, the depth stop for slipping, and the supply lead for cuts before each shift, replacing — not repairing — any tool with a cracked housing, missing carbon-brush cap, or intermittent trigger [S4].
Selection Criteria Compared: 600 W vs 700 W vs Cordless
Three specs cover almost every electrical-installation drilling task: the 600 W corded (Bosch GSB 13 RE, Bosch EasyImpact 600), the 700 W corded (Bosch UniversalImpact 700), and an 18 V cordless impact drill (10-13 mm chuck). On sustained masonry work the 600 W is the lower bound for continuous duty, the 700 W adds thermal margin and faster drilling in concrete, and the cordless wins on mobility but loses on a full day's masonry drilling without a spare battery [S1][S5]. On price, the 600 W EasyImpact retails near £42.29 and the 700 W UniversalImpact near £89.98, with the pro-tier GSB 13 RE in between on UK retail [S1]. On chuck capacity, both 600 W and 700 W corded units ship with 13 mm chucks, while entry cordless units more often ship with 10 mm — a hard limit on bit diameter that rules them out for 12 mm masonry work [S1][S5].
For a working electrical installer, the lowest-risk spec is a 240 V corded 600-700 W impact drill with a 13 mm keyless chuck, a 210 mm depth stop, an RCD on the supply, and a bit kit spanning 3-12 mm masonry plus 1/4" hex drivers — see our impact drill spec map for road maintenance crews for shank and joule boundaries outside the installation trade. For the broader tooling workflow, the palletizing robot selection guide is the adjacent spec reference once the build moves from on-site drilling to factory-scale assembly. Track two signals over the next quarter: 18 V cordless impact drills adding 13 mm chucks as standard (closing the corded-cordless chuck gap), and tightening of EU efficiency rules on no-load power draw for 600-700 W mains drills.
For the relevant spec sheets and selection criteria, see impact drill, air impact wrench, and electrical fire monitor.
